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bolt head markings and what they mean

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STANDARD BOLT IDENTIFICATION MARKINGS

The lines on the head of a bolt indicate its grade SAE J429 Society of Automotive Engineers bolts have radial lines whereas ASTM American Society for Testing and Materials uses a combination of letters and numbers to indicate the grade Find out Bolt Head Markings What Do They Mean Fasteners 101 fasteners bear all forms of markings on their heads from number and letters to shapes and hash marks but what do they mean boltsnutsscrewsonline how to tell the grade of a stainless steel bolt or set screw by reading the head markings

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What do bolt markings mean

2019 8 9 nbsp 0183 32 All fasteners come with certain markings on their head which will help you identify their make material and dimension Fastener manufacturers are accountable for ensuring that customers know what they purchase Here is a handy guide which will help you navigate through identifying the fasteners with the markings present on them Often one will find quot extra quot marks on a bolt head marks in addition to those shown above Usually these marks indicate the bolt s manufacturer ASTM A325 Type 2 bolts have been discontinued but are included above because they can be found in existing structures Their properties can be important in failure investigations

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Question What Do Markings On Bolt Heads Mean Know

2021 4 10 nbsp 0183 32 Here we have a bolt head with the Wilson Garner manufacturer mark and six radial lines These radial lines indicate that the bolt is a Grade 8 bolt A quick aside – You may notice that in the images the WG mark has been moved around a bit to accommodate the grade markings This is a totally legitimate practice 2018 8 8 nbsp 0183 32 Fasteners bear all forms of markings on their heads from number and letters to shapes and hash marks But what do they mean In this video our fastener spe

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Bolt amp Screw Head Markings and What They Mean – Part 3 Wilson Garner

2019 7 7 nbsp 0183 32 What do bolt head markings mean Sometimes there are lines on the bolt head The lines on the head of a bolt indicate its grade SAE J429 Society of Automotive Engineers bolts have radial lines whereas ASTM American Society for Testing and Materials uses a combination of letters and numbers to indicate the grade US Bolts Head Marking Grade and Material Nominal Size Range inches Mechanical Properties Proof Load psi Min Yield Strength psi Min Tensile Strength psi 307A Low carbon steel 1 4 quot thru 4 quot N A N A 60 000 No Markings Grade 2

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What do bolt markings mean

2012 11 2 nbsp 0183 32 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 In most cases bolts used in machinery are made to SAE standard J429 and bolts used in structural applications are made to ASTM standards Fastener manufacturers mark the heads of their bolts and screw with the identification mark This is normally a trade mark but can be an abbreviation of their company name or a symbol Traceability is important particularly in the case of fastener failure

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Bolt amp Screw Head Markings and What They Mean – Part 3

Hex Bolt Identification Markings and Strength Chart Table Guide Hex Bolt Identification Markings and Strength Chart Additonal information on bolts is located at the bottom of the webpage Note Some bolts share identical head identification and What are some common head markings on stainless steel bolts and screws If you look at the head of a stainless steel fastener you might see a marking stamped onto the surface These marks hold valuable information about the

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Building Fasteners FAQ What Do Fastener Markings Mean

Bolt Head Markings What do they mean Fasteners 101 Fasteners Views 1462 Update time 2020 06 11 14 36 57 Previous How to Operate a ZTR Lawnmower Next How to Change the Blades on a Riding Lawn Mower Related News Read More gt gt Pay attention to the following points when installing the synchronous belt2020 5 22 nbsp 0183 32 The lines on the head of a bolt indicate its grade SAE J429 Society of Automotive Engineers bolts have radial lines whereas ASTM American Society for Testing and Materials uses a combination of letters and numbers to indicate the grade