Bolt identification markings. 65,000 Typical: 65,000 Min.
Bolt identification markings 8, 10. 3. Properties shown Bolt Marking & Identification — Metric & UNC/UNF 70 70 Metric Imperial Class 4. markings are found on the top of the bolt handle, but usually, these are later bolts. This standard dictates the mechanical and material property requirements for inch The image above shows markings (radial lines) on the top of a hex head for grades 2, 5, 8 and L9. png file. Metric bolt Class 8. The bolts are made of different grades of steel and the grades are to determine the Zero Products, Inc. , “X” ( on head of bolts and screws and on one end of studs and stud bolts). However, the SAE J429 specification that covers grade 8 fasteners does not require grade markings for studs (fully threaded rods) or slotted and cross recess head products. 25 and it has a raised letter q on the head. 1/4 thru 1-1/2. Min. They show examples of the typical bolt grade markings for each In 1987, head marking requirements changed from requiring no grade identification to requiring a ‘307A’ marking on the head in addition to the manufacturer’s identification. The bolt heads also have a code of normally two or three letters that indicate the manufa. Significance of Markings. ) Grade 2 is standard hardware grade steel. The three principal parts of a bolt are the head , grip , and Bolt Identification Markings Identification Specification Grade Mark Fastener Description SAE J429 Grade 1 ASTM A307 Grades A&B No Grade Mark Low- or Medium-Carbon Steel Bolts, Screws, Studs Mechanical Properties Proof Load Yield Strength Tensile Strength (psi) Min (psi) Min (psi) ⁄ thru 11⁄2 33,000 1 4 ⁄ thru 4 −− −− 55,000 33,000 57,000 36,000 74,000 60,000 ⁄ thru General. Typically, identification markings on bolt heads include the grade and the manufacturer’s mark. Common marks include ' 18-8' for stainless steel containing approximately 18% chromium and 8% nickel or '316' for marine Specification and Material Codes Grade Marking Required Markings ASTM A193 Grade B8 Class I Regular Series Heavy Series 67608 Symbol for identification of grade, i. SAE nut grade 2. Common Nuts Markings Nuts are also coded by grade. Using a vernier, measure the diameter of the threaded part of the bolt/setscrew, as shown in Fig. These markings provide information about the bolt’s strength, material, and manufacturer. SAE nut grade 5. Metric nut Class 8. 10. These markings are standard. This precision marking system streamlines the identification process, saving Identification Grade Mark Specification Fastener Description Material Nominal Size Range (in. There are three primary standards. Properties shown are those of nonplated or noncoated coarse thread hex nuts. , “X” (on head of bolts and screws and on one end of studs and studs-bolts). This Fastener Identification Markings Chart shows the various marking Our Fastener Identification Markings Chart has a complete list of bolt grades with accompanying head markings. Here is a detailed guide on how to read and interpret these markings: Identify the Material Grade. In most cases, bolts used in machinery are made to SAE standard J429, and bolts used in structural applications are made to ASTM standards. Nuts and bolt heads often have symbols and letters marked on them. A2-50 Stainless Steel alloy with 17-19% chromium and 8-13% 1/2" thru 85,000 92,000 120,000 nickel 1-1/2" Stainless markings vary. The bolt manufacturer, at his option, may add other Stainless markings vary. 8 and above are made of low-carbon alloy steel or medium carbon This chart outlines the common grades of bolts we carry at Global Certified Fasteners. Toll Free: 800-991-1280 Fax: 713-675-6066 Local: 713-675-0123 zerofast@zerofast. 219 Baywood. The most common bolt grades are 8. 9; Alloy steel, quenched and tempered 970 1220 (176,000 psi) 1220 Usually stamped A-2 or A-4; About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright The corresponding hex nut is identified by a I8I marking. Hexagon Head Bolts. Fasteners are identified by four or five attributes; Type, Material, Diameter, Length, and Thread Pitch or Count (machine thread fasteners only). Aircraft bolts may be identified by code markings on the bolt heads. SAE nut In ordinary usage of steel bolts, the chemical composition of the material and the manufacturing process are of little interest to the user, provided that the service 7 Mechanical Properties and Identification Markings for Threaded Fasteners www. Additonal information on bolts is Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing. I am not talking about the lines on the heads of bolts that indicate what Grade the fastener is. 8 (Stainless Steel) (Structural) Metric B7 Studs Grade 316 (High Tensile) manufacturer’s marking that has been registered with NIST (National Institute of Standards and Technology) if it is to be sold in the U. Below is a picture Understanding the Purpose of Bolt Head Markings Bolt head markings serve multiple purposes. A325 Type 1 bolts may also be marked with 3 radial lines 120 degrees apart in addition to the A325 marking. SAE bolt grade 5. The markings can identify the standard to which the bolt was Property Class 8. This document provides information on bolt and nut identification markings. 6. This will vary from manufacturer to manufacturer, but is usually one, two or three characters. com, to get the name right the first time!. These bolt head markings include the manufacturer’s mark, the grade of bolt (ex. This allows for easy traceability, which in turn helps to instill a sense of accountability in the Zero Products, Inc. Aerospace bolt head As with the metric fasteners, the imperial bolts are also marked with letters that denotes the manufacturer. Most stainless is non-magnetic: 18-8 Stainless. The grades of a fastener can represent what material it is made out of, its hardness range, and its 316 Stainless Steel Bolt Head Markings Metric bolts made of 316 stainless steel are marked on the head of the bolt with A4-70 The markings can indicate who manufactured the bolt. Bolts Screws Pins Washers Nuts Cable Chain Drop Forged & Turned Wire Hardware Alloy Socket Masonry Electrical Terminals B'laster Products “Product Marking- Bolts and Screws- Internal drive screws of all sizes and other screws and bolts of sizes smaller than ¼ in need not be marked. Metric nut Class 5. 8: Grade 8. Fasteners, Inc 252 Kruse Ave Monrovia, CA 91016 Akko Fastener, Inc 6855 Cornell Rd Cincinnati. 9 (Higher Tensile) 0_ Metric Metric Grade 304 Class 8. 6 SAE Grade 5 (Mild steel) (High Tensile) Metric Imperial Class 8. SAE bolt grade 8. 7-36. While SAE J429 Grades 2, 5, and 8 are probably the most common inch-series fastener specifications that we deal with here at Wilson-Garner, there are plenty of other ones with their own grades and head markings. All other screws and bolts of sizes 1/4 in and larger shall be marked permanently and clearly to identify the strength grade and the manufacturer. It lists the material specification, mechanical properties, size range, and hardness ranges for various grades of carbon steel and stainless steel The Society of Automotive Engineers has a standard called SAE J429 Mechanical and Material Requirements for Mechanical Fasteners. 8 BM 8. Cap Screw ID This type of bolt has no markings whatsoever on the head. Fasteners commonly have two different markings: a unique manufacturer identification symbol – such as letters or an insignia – and information about the fastener strength. For example, all grade 5 bolts will have three radial lines on the head. There are some straight bolts that have no markings - these are usually identified as very early Springfield or Rock Island bolts. On standard nuts, Grade 2 are not Low Carbon Steel 1/4 thru 4 -- --Bolts, Screws, Studs No Grade Mark 1/4 thru 3/4 Over 3/4 to 1-1/2 SAE J429 Grade 2 Low or Medium Carbon Steel 55,000 33,000 57,000 36,000 74,000 60,000 the identification marking shall be the grade letter O, A or B. METRIC NUT GRADES, IDENTIFICATION MARKINGS AND STRENGTH. Grade 2 or Lower US Grade Bolt Markings - Strength Requirements ; Head Grade Marking Specification Material Nominal Size (Inches) Proof Load psi Tensile Strength Min psi Yield Note: Manufacturer's identification mark are also stamped when applicable. The most common grading systems for bolts are: Society of Automotive Engineers (SAE): Numbers represent SAE grades, with higher numbers Most grade 8 bolts require a permanent marking symbol that is designated by 6 radial lines. Duplex Fasteners 89, 2nd Pathan Street, Maruti Mandir Marg, 5th Kumbharwada, Mumbai, India 400 004. Proof Load Stress ksi. These resources can save you hours of guesswork, especially when you’re dealing with niche or less-known manufacturers. The manufacturer's unique symbol is engraved on the bolt head for traceability and quality assurance purposes. Mail: info@duplexfastener. Yield Strength Min. Q & T - Quenched and Tempered. The type of mark depends on the standard to which the bolt Common Bolt Head ID Markings . Manufacture’s identification mark, e. S. The grade identification symbols shall be as shown Bolt Grades and Head Markings (Inch & Metric) Bolt Grades and Head Markings – US Inch and Metric Visit our online store for product availability Identification Grade Mark Specification Description Material Proof Load (psi) Yield Strength Min (psi) Tensile Strength Min (psi) SAE J429 Grade 5 ASTM A449 Bolts, Screws,Studs Medium Carbon Steel Bolt Markings. 9 on the head. When marked, the identification marking Decoding these markings ensures you’re using the right bolt or nut for your project, whether working on a car, building furniture, or tackling industrial equipment. Screw and bolt head markings are used to identify the manufacturer of the fastener. Grade 5 bolts will have 3 radial lines. txt) or read online for free. But first, you'll need to know the difference between standard (SAE) and metric fasteners. 5. 8 bolts and screws have a minimum tensile strength of 800 MPa for bolts and screws 16mm in diameter and under, and 830 MPa for bolts and screws with Contact Us. It lists various specifications for bolts, screws and SAE bolts are widely utilized as the standard bolts for automotive, machinery, and OEM applications, particularly in North America. Metric nut Class 10. Look at the threaded part of the bolt/setscrew and identify if it is a fine thread or coarse thread. Watch the video below for more detail. Class 12. Remember: the ratings for standard bolts (often Grade identification markings on metric fasteners per ISO 898-1. OH 45242 Standard Metric marking marking marking Albany Fasteners/ Pawtucket Fastener DIV 327 Pine st Pawtucket, RI 02862 S B PMC Allfast Fastening Systems 15200 Oon Julian Rd Get detailed insights into bolt head markings and grades at ASMC to help you choose the right fasteners that meet industry standards and requirements. Manufacturer’s identification mark, e. a. This standardization handbook was developed by the A449 Bolts and Ued Yes Over l-1/2 TS PSI tin 90,000 Marked on top of head 1 Scuds Carbon thru 3 dia Prf Load PSI 58,000 for bolts and on end /\ Fasteners bear all forms of markings on their heads, from number and letters, to shapes and hash marks. 9 also. Proof Load(psi)Yield StrengthMin (psi)Tensile StrengthMin (psi)Low or Medium Carbon Steel1/4 THRU 1 33,00036,000 Low CarbonSteel1 4 thru 4 SAE J429 Grade 2 Low or Medium Carbon Steel1 4 thru 3 4 Over 3 4 thru 1 55,00033,00057,00036,00074,00060,000 No Grade MarkSAE J429 Grade 4 StudsMedium When marked, the identification marking shall be the grade letter O, A or B. On the head of each bolt there are two numbers which are separated by a decimal point. English bolts have radial lines on their head to identify the grade, or strength class. Properties shown are those of non-plated or non-coated coarse thread hex nuts. Although markings are shown on hex heads, grade markings apply equally to products with other head configurations. net Note: For more information on tensile testing, please see ISO 6892-1 Socket Screws, Set Screws, Eye Bolts, Eye Lags, J-Bolts, U-Bolts, Shoulder Bolts, Elevator Bolts Screw and Bolt Head Types – Identification Chart (Courtesy of BoltDepot. TDS-005A 2-15-08. So, for example, a grade In addition to these markings, most reputable bolt manufacturers will also stamp their trademark in the head of the bolt, which allows for easy identification and accountability. The term Grade is the word we use to identify the material, hardness, and strength Bolt head markings are a combination of letters and numbers that can help you identify the fastener that you’re looking for. When marked, the identification marking shall be the grade letter O, A or B. This page describes what these attributes represent. The dimensional requirements are contained in ANSI B18. Material. Metric class 8. The following are the standard head markings for both metric and imperial fasteners. com All specifications shall be marked by the manufacturer with a unique identifier to identify the manufacturer or private label distributor, as appropriate. The hex head of the bolt or nut will often contain different markings from the manufacturer which gives information on the different grades and classes of steel that the bolts are made from. Thus, for the bolt of property class 8,8 in the above example a nut of property class 8 is required. ) This technical information is supplied as a courtesy. Therefore, you will not be able to visually identify a threaded stud that is certified to an SAE Study with Quizlet and memorize flashcards containing terms like What is the head marking for a standard steel bolt?, What does the first number after 'AN' designate in standard steel bolt designation?, What size wrench is used on standard steel bolts? and more. See Note. Bolt grades, which indicate the strength of your fastener, are determined by the standard the bolt adheres to. Low Tensile (Imperial) Grade 2 72,000 psi Imperial Bolts: The tensile strength is measured in tons per square inch or 1000’s of pounds per square inch. TDS-005A 2-15-08 bolt identification and grade bsa spoke kits . thru 1" Min. I'm fairly sure this is Japanese. co. ISO Metric Hardware. Metric Markings SAE Bolt Head Markings. You cannot find a more complete and up-to-date compilation of manufacturers’ marks! Use it for identification of purchased fasteners, inventory traceability, maintenance repair, replacement, Stamping of F1554 and A307 grade C bolts is a supplemental requirement while color coding is required. (psi) 1/4”-1” R C 25-34 85,000 92,000 120,000 : Grade 8 ASTM-A354 SAE J429: Size Hardness Rockwell Proof Load Bolt Marking & Identification – Metric & UNC/UNF M BM 8. Home | Size / Thread Reference. The sheet contains markings for both imperial and metric bolts. Bolt heads and nuts are often marked with numbers, letters, dashes, slashes, dots, or an assortment of other marks. Finally, it lists recommended assembly torques for metric ISO bolts of various diameters and classes, along with surface condition The most common SAE bolt grades are Grade 2, Grade 5, and Grade 8. Item Name. Information on how they are written can be found on our How Fastener Measurements Are Notated page. A quick aside – You may notice that in the images the WG mark has been moved around a bit to accommodate the grade markings. (psi) No Markings Grade 2 Low or Medium Carbon Steel 1/4” thru 3/4” 55,000 57,000 74,000 7/8” thru 1-1/2” 33,000 36,000 60,000 Fastener manufacturers mark the heads of their bolts and screw with the identification mark. In this article, we’ll take a look at three standards from ASTM: 1. Look for Grade Numbers or Letters: Examples of Bolt Markings and Their Interpretation. Metric bolt Class 10. d. In addition to the "BD" marking, the product may be marked with 6 radial lines 60 In 1987, head marking requirements changed from requiring no grade identification to requiring a ‘307A’ marking on the head in addition to the manufacturer’s identification. A2-70: A stainless steel BOLT HEAD MARKINGS and Strength Standards -- UT-121. All Grade BD products shall be marked "BD". 1, “Square and Hex Head Bolts and Screws Inch Series”. Yield Strength (MPa FASTENER SUPERSTORE Bolt Grades & FASTENER GUIDE Head Markings (866) 688-2500 | WWW. These radial lines indicate that the bolt is a Grade 8 bolt. Finally, our last example from SAE J429: Here we have a bolt head with the Wilson-Garner manufacturer mark and six radial lines. 9: Grade 12. Early manufacturing only cared about basic size and thread measurements, but as machinery got more complex and manufacturing went Common markers include letters, numbers, dashes, slashes, dots, and many more. ASTM A 193 Grade B8M Class 1 Regular Series and Heavy Series X 67610 B 8 M Symbol for identification of grade, i. 8 M BM 10. Many of our bolt styles are available in various grade and class options with Bolts, Screws, Studs 60,000 Bolts, Screws, Studs ASTM A307 Grades A&B 60,000 STANDARD BOLT IDENTIFICATION MARKINGS Identification Grade Mark Specification Fastener Description Material Nominal Size Range (in. com Bolt Head Markings sales@mainlandfasteners. This nut will have a Proof Load Stress of 8 x 100 = 800 MPa In practice only standard threaded fasteners in the high tensile property classes, x Bolt 1 550 Hupp warren, Ml 48089 End Ot pont optanal. Lower-grade fasteners will stretch more easily than higher-grade fasteners. Precision Markings: The bolt thread identifier is equipped with laser-etched markings, ensuring clear and accurate identification of thread sizes. Nuts are not required to be marked unless specified by the purchaser. 1. Hi I have a precision steel bolt M10 x 1. These charts helps to identify the grades of bolts using the identification marks on the bolt's head along with the strength and hardness of common grade bolts. But what do they mean? In this video our fastener spe When marked, the identification marking shall be the grade letter O, A or B. SAE vs. I get the impression this is the metric "clock face system" but can't find any hard data on it. The bolt manufacturer, at his 1. A2-70 Stainless Steel alloy with 17-19% All Sizes 20,000 65,000 Min. Below, we’ll explore both of those The push for standardized bolt markings came from real problems in the industry. Nominal Size In. Why Are Nuts and Bolts Marked? Bolts heads of different types are stamped with differing markings for two purposes. 9 M BM B7 A2 M BM 70 A4 M BM 70 BM BM Metric Class 4. 100,000-chromium and 8-13% nickel 65,000 150,000 Typical Typical ' Stainless markings vary. Grade 2 ASTM-A307 SAE-J429 (Call us for specifications. - Hex nuts shall be marked by an indentation on the side or the bearing surface or by an embossment on the chamfer of the hex nut. Max. Many nuts and bolts follow SAE or Metric standards ensuring strength and reliability. 2. Each grade is having its distinctive head marking and it is the primary indicator of its use. Mudge Fasteners wants to help you decipher these head markings and when you'll need to The Society of Automotive Engineers created a system of grades to identify valuable information about the fastener. (Photo courtesy of Fastenal Co. Alma Bolt Company & Prime Fasteners 1-800-526-2200. 8 (High Tensile) Metric Class 10. While the wording in the specification may technically only address hex bolts and studs, logic would dictate the marking requirement would also extend to other configurations ASTM, SAE and ISO Grade Markings for Steel Fasteners Stainless markings vary. I have seen a couple of different marking systems for metric grades, but not this. Although markings are shown on hex heads, This resource provides clear illustrations of different markings on Hex Head Bolts and Nuts. - Bolt - Nut assemblies with threads tolerances wider than 6H/6g, there is an increased risk of stripping. Written December 4, 2007 , modified October 24, 2014 2014-10-24 manufacturer identification. 69. g. Properties shown are those of coarse thread heavy hex nuts. The corresponding hex nut is identified by a 10 marking. Grade Marking. × We've enhanced our website with improved search and filtering options, streamlined navigation, and new features to make finding what you need faster and easier. B55. The bolt grade markings are illustrated in the charts. The document provides information on bolt marking and identification systems for metric and imperial bolts, including tensile strength classes/grades. Not that the guys at the hardware store don't need a chuckle every now and them. , manufacturer identification), mechanical testing, or chemical composition requirements. Marking Specification Material Bolt & Screw Size, Inches Min. To be able to be classed as stainless it will have a chemical composition of at least 10. At one time or another, all of us (even the pros) misidentify a fastener. A4-80 Stainless BOLT HEAD MARKINGS and Strength Standards -- UT-121. I am not referring to the new coded head but the old stamped head markings for example on the screw anchor bolts How to identify Hilti anchor bolts by their head markings? Posted by Jamie Boots almost 2 years ago. 8. Par 7-34 . Determining Bolt Grade and Head Markings with Northeast Fasteners on NutsandBolts. Direct Number: (817) 467-1377 800 Number: (800) 361-6627 Fax Number: (817) 467-5365 1916 Peyco Drive North Arlington, TX 76001. 0800 009 6949; bolt types are shown in table 7-12. Fasteners are a metallic screw, nut, bolt, or stud having internal or external threads, with a nominal diameter of 6 millimeters or greater, in the case of such items described Understanding a Few Common ASTM Inch-Series Bolt Grade Markings. Grade 8 bolts will have 6 radial lines. 4. Unravel the mystery behind these markings, ensuring you select bolts that meet the required specifications for your project. ” 3. The markings shown for all grades of A194 nuts are for cold formed and hot forged nuts. It also includes tables comparing tensile and yield loads for different bolt sizes and classes/grades. AN standard steel bolts Bolts, Screws, Studs 60,000 Bolts, Screws, Studs ASTM A307 Grades A&B 60,000 STANDARD BOLT IDENTIFICATION MARKINGS Identification Grade Mark Specification Fastener Description Material Nominal Size Range (in. Email: Aircraft Bolt Identification, Guide Table. 3,4. GRADE - Determine what grade Bolt you need or was STANDARD BOLT IDENTIFICATION MARKINGS. A325, A490), and markings to classify the type of bolt (Type 1 or Type 3). 8 Aerospace bolt head markings are used to identify the different head types on the bolt itself. com Bolt grades, which indicate the strength of your fastener, are determined by the standard the bolt adheres to. 8 = M16 (> M16) Grade 10. Here are the markings that indicate Grade 2, Grade 5, Grade 8 & Structural Bolts. Metric Steel Bolts: Standards: ISO 898 Part 1: Identification Mark: Product Specifications: Grade 4. 1/2" Coarse 316 stainless steel bolt head markings. What Are These Numbers? Bolts are made at different strengths. e. J. 6 (Mild Steel) Metric Class 8. Check if there are any head markings. For example grade 2 bolts will have no markings or radial lines. These bolts adhere to the SAE J429 Specifications, The higher the grade, the stronger the bolt. ANSI Hardware Guide ( AN and NAS ) type bolts and their identifying markings. com ) Flat, Oval, Pan, Truss, Round, Hex, Hex Washer, Slotted Hex Washer, Socket Cap, Button Heads Bolt, Screw, Nut and Washer Identification Chart. pdf), Text File (. Hardness Rockwell. 100,000 – 150,000 Typical: Metric Bolts: Head Marking Class and Material Nominal Size Range (mm) Mechanical Properties; Proof Load (MPa) Min. Houston TX 77011. 8 SAE Grade 8 (High Tensile) (Higher Tensile) Metric Class 10. SAE bolts are identified by the head markings on the top of the bolt. This sheet We would like to show you a description here but the site won’t allow us. ) Mechanical Properties ; Proof Load (psi) Yield Strength Min (psi) Tensile Strength Min (psi) No Grade Mark: SAE J429 Grade 1: Bolts, Screws, Studs: Low or Medium Carbon Steel: 1/4 thru 1-1/2: 33,000: 36,000: 60,000: ASTM A307 Grades A&B: Low Carbon TM 1-1500-204-23-6 Figure 2-2. Such markings differ based on how the fasteners were made. The performance grades of bolts for steel structure connection are divided into more than 10 grades, such as 3. IMPERIAL SOCKET SCREWS. Understanding bolt grades is critical to choosing the right one. May 19, 2004 32. SAE bolt grade 2. bsa 1959 to 66 500 & 650 twins front drum hub; bsa 1967 to 70 650 & a75 front drum hub; bsa 1971 to 1973 a65, a70, a75 & b50gs front drum This bolt is metric. parts. A325 Type 1 bolts may also be marked with 3 radial lines 1200 apart in addition to the A325 marking. bolt is a standard AN-type or a special-purpose bolt, and sometimes include the manufacturer. , “B8”, applied to head. The ASTM requires structural bolts to be distinctively marked. Carbon Steel. Unlike the previously bolt head marking Thread starter azzt; Start date Jun 28, 2016; Status Not open for further replies. e. ASTM, SAE AND ISO GRADE MARKINGS AND MECHANICAL PROPERTIES FOR STEEL FASTENERS FASTENER IDENTIFICATION MARKING. Jun 28, 2016 #1 azzt Mechanical. 65,000 Typical: 65,000 Min. Yield Strength: The maximum load at which a material exhibits a These markings tell you what the bolt is made from and how it's protected against corrosion. 8, and 12. -A354, Grade BD Bolts & Studs Alloy Steel Yes 1/4” to 1-1/2” 120,000 125,000 150,000 - 302/352 C32/38 BC A354, Grade BC Bolts & Studs Alloy Steel Yes Screw and bolt head markings identify the manufacturer of the fastener and the standard to which the fastener was made. This resource provides clear illustrations of different markings on hex head bolts and nuts. Scope of Supply: Supply of Stud Bolts (A193 B7/B7M/A320 L7/L7M/A193 B8 CL2/B8m CL2)(PTFE Coated), Hex Bolts, Anchor The only true way to ensure specification compliance is a material elementary analysis with an X-Ray Spectrometer. 1, Type Identification reads similarly: The reasons bolts require marking is so that they are easily visually identifiable by the end user. Here's how you can understand what they mean. svg file. nz 03 366 5590 . The following markings This may include the failure to meet specific criteria such as marking (e. C32. Hexagon Head Bolt Identification e. Identification Markings for Fasteners Date of approval : 1. Bolt head markings are a combination of letters, numbers, or both, which help identify the fastener. 6, 8. com +91-22-66363233 Bolt markings provide essential information about the bolt’s grade, strength and material. Bolt markings carry valuable information about their grade and strength. Click on image below to enlarge . The strength and type of steel used in a bolt is supposed to be indicated by a raised mark on the head of the bolt. The number of lines on the bolt head is 2 less than the actual grade. Tensile Strength B8 B8MA B8C B8T B8R B8S F593U ASTM & SAE Grade Markings for Steel Bolts and Screws 18 - 8 18 Chromium 8 Nickel ASTM A193 / A320 GR B8 CL-1 ASTM A193 / A320 GR B8M CL-1 ASTM A193 / A320 GR B8MA CL - 1A ASTM A193 GR B6 ASTM A193 GR B8C CL-1 e. SIZE - Determine the Size of Bolt/Screw; FINISH - Determine the Finish on the Bolt/Screw; HEAD MARKINGS - There are many Head markings, here are a just a few. Every aerospace bolt will have a head marking. All grade 8 bolts will have six radial lines on the head. Bolt head markings allow you to visually identify bolt grades quickly and easily. Delve deeper into the significance of bolt markings. Let’s dive deeply into understanding bolt grade markings, nut grades, and key identification tips so you’re equipped to make informed decisions. COM Live Support Specialists Available Via Phone & Chat Many of our bolt styles are available in various grade and class options with each grade containing distinctive head markings. 9, and 12. 713-462-3147) Grade 5 ASTM-A449 SAE-J429 : Size Hardness Rockwell Proof Load Yield Strength Tensile Strength min. The Hex Head contains different markings which give information on the different grades of classes of steel that the bolts are made from. I am talking about the letters, numbers, and symbols. 9. No Mark. bolt identification and grade Manufacturer identification. Use this handy chart, courtesy BoltDepot. , “X” ( on head of bolts and screws and on one end of studs and stud Grade & Material Identification Markings Required by ASTM Specifications A325 Nuts for High Strength Bolts Carbon Steel No 1/2" to 1-1/2” - - - 144,000 143 min. 9 Socket Head Cap Screws: Material: Low/Medium Carbon Steel: In addition to these markings, most reputable bolt manufacturers will also stamp their trademark in the head of the bolt, which allows for easy identification and accountability. 8 & 10. The type of mark depends on the standard to which the bolt was manufactured. Embossed markings must not protrude beyond the ASTM A449, Section 16. IDENTIFICATION. parts A. They will indicate if the bolt is metric or imperial and the grade/class. The markings indicate the manufacturer, material used, and the bolt's tensile strength. Notes regarding Fastener Identification Marking. Can anyone tell me if this relates to the material strength or is it Grade Identification Markings for Carbon Steel Externally Threaded Fasteners 1. This is normally a trade mark but can be an abbreviation of their company name or a symbol. FASTENERSUPERSTORE. 9 (Higher Tensile) Metric Grade 304 (Stainless Steel) Metric Grade 316 (Stainless Steel) Imperial SAE Grade 5 (High Tensile) Imperial SAE Grade 8 (Higher Except for the very lowest grades metric nuts and bolts all carry identification markings which indicate their strength. . (866) 688-2500 Bolt Grades & Head Markings. The markings indicate who manufactured the bolt and also identify the standard to which the bolt was made. If it matters, that's a Sometimes i. Metric Bolt Grades Chart with Strength Chart. The markings shown for all grades of A194 nuts are nut must be additionally marked with the letter “B. This unique guide illustrates fastener manufacturers’ marks applied to their products and contains markings for over 2100 companies in 41 countries, including both active and inactive marks. 8: Grade 5. 28 TSI or 62,220 PSI The la Fastener Identification Markings Grade Radial Bolt Markings Material Nominal Size Diameter/Inches Proof Load psi Tensile Strength minimum psi Yield Strength minimum psi Grade 2 No Radial Lines Low or Medium Carbon Steel 1/4" to 3/4" 55,000 74,000 57,000 Over 3/4" thru 1 1/2" 33,000 60,000 36,000 Grade 5 3 Radial Lines This document provides information on identification markings for common grades of fasteners. Primarily, they denote the manufacturer's identity, allowing traceability, especially if issues arise with specific batches of Grade 8 Bolts. Please note the bolt heads may also include the manufacturer's identification stamp, especially with high strength In addition to the indicated grade marking, all grades, indentification. In addition to the indicated grade marking, all grades included in this Table must be marked for manufacturer identification. ASTM A194/A194M -- Carbon and Alloy Steel Nuts for Bolts for High Pressure and High Temperature Service. If it does not have a marking, it is a commercial grade bolt. 2. When nuts are machined from bar stock the nut must be additionally marked with the letter “B. The next highest grade is the SAE grade 5 bolt which is made out of tempered carbon steel that has a tensile strength of no less than 105,000 pounds per square I am not referring to the new coded head but the old stamped head markings for example on the screw anchor bolts. Markings on Bolt and Nut Heads. According to the Fastener Quality Act, each fastener must be marked with the manufacturer's unique symbol to identify who made it. ” Nuts are not Hex Bolt Identification, Markings and Strength Chart. 9 Metric is equivalent to Grade 8 fasteners and can be identified with a 10. Remington M1903 and M1903A3 bolts have an "R" on the underside, but again, these have "swept" bolt handles. 5% Chromium, and meet other For a more guided approach, websites like identification bolt head markings manufacturer offer practical tips and step-by-step guides that can clarify what your specific bolt markings represent. In addition to the indicated grade marking, all grades included in this table must be marked for manufacturer identification. Also for information on fastener abbreviations please see our Common Bolt Grade Markings & Strength American Bolts Head Marking Grade or Class Material Nominal Size Range (inches) Mechanical Properties Proof Load (psi) Yield Strength Min. practicalmaintenance. Headed bolts are required to be stamped on top of the head, while most rods and some bent bolts are required to be stamped on one end. Here are some common markings you The bolt types are available in varied grades and class options. (psi) Tensile Strength Min. , “B8M”, applied to head. Among them, bolt grade 8. Category:Fastener identification markings Wikidocumentaries; KML file; Search depicted; Metric bolt Class 5. These markings generally denote the material of which the bolt is made, whether the . Deciphering Bolt Markings Understanding Bolt Grade. ASTM A563 – Grade 0. ASTM A307 Bolt Head Markings. The markings E5, E8, and EMP have all been registered by Earnest Machine Products for use on our inch-size fasteners. The identification numbers show that the bolts Bolt Identification Marking - Free download as PDF File (. In Bolt heads and nuts are often marked with numbers, letters, dashes, slashes, dots, or an assortment of other marks. The standard aircraft machine bolt (hexagon head) is an all-purpose structural bolt used for general applications involving tension and shear loads. Steel alloy with 17-19% Chromium and 8-13% Nickel: All Sizes thru 1: 20,000 Min. rmljfnjyewnthgcjqpnxhydoevwbmeobhsxqsdcnoziorkmjcbuunmyasbpjqaznfgvnpb