51 rows·In addition to the indicated grade marking,all grades,except A563 grades O,A and B,mustAircraft Hardware,by Ron AlexanderIf you see no markings at all on the head of a bolt,do not use it.It is probably a commercial grade bolt.The markings on bolts vary according to the manufacturer.You should see an X or an asterisk along with a name,etc.If you purchase a corrosion resistant (stainless steel) bolt,the head of that bolt should have one raised dash.
The proof strength of Grade 2 bolts between.24 and.75 inches is 55 ksi (thousand pounds per square inch),and 60% of this is 34.2 ksi.So,were looking for a bolt with a tensile area greater than our load (2.5*100 lbs) divided by 33 ksi,or.0076 square inches.A #6 UNC should work.Bolt Depot - Bolt Grade Markings and Strength Chart23 rows·US Bolts Head Marking Grade and Material Nominal Size Range (inches) MechanicalBolt Lubricant and Torque A Comprehensive Guide - Hex Jan 30,2021·For example,we once saw a company do a test on 1/4 inch bolts.The problem The average size bolt in the petrochemcial industry is 3/4 inch.So those tests werent especially helpful.It should also be noted that recent research has shown there to be nut factor dependence on bolt material,bolt diameter,and assembly temperature.
A grade 2 bolt has no markings,a grade 5 bolt will have three markings,while a grade 8 bolt will have six lines.Metric bolts are more simply identified the class is explicitly stamped on the bolt head.Other standards regulate specific types or applications for bolts and they should be consulted as needed.Common Automotive Fasteners Guide NAPA Know How BlogThe grade markings on the head tell the story.SAE bolts use hash marks.SAE Grade 8,Metric 10.9.These bolts are the highest yield fasteners for carbon steel.They feature 6 radial lines on the head and are made from medium carbon alloy steel which has been quenched and tempered.Metric bolts have the grade number formed on the head face.Determining Bolt Grades and Understanding Head MarkingsDetermining Bolt Grades Understanding Head Markings The Nut and Bolt Solution Series.Identifying bolt grades and head markings for US grades 2,5 and 8.Metric grades 8.8.,10.9 and 12.9 (socket products).Video 1 Determining Bolt Grade and Head Markings
There are certain tools whose proper selection and use go beyond making your job faster and easier and actually affect workplace safety.Eye bolts are such tools.For this reason,selecting and using eye bolts correctly can make the difference between a safe work environment and one that puts peoples lives atFastener Basics - Bolt DepotLow Carbon Grade 5 Grade 8 Class 8.8 Class 10.9 Class 12.9 US bolt head markings Metric bolt head markings 8.8 10.9 12.9 Hex bolts,or hex cap screws,are used in machinery and construction.Can be used with a nut,or in a tapped hole.Fully threaded hex bolts are also known as tap bolts.Wood screws have large threads and a smoothFasteners Bolt Grades,Strength MaterialsAs far as grades go,I was showing you the grades,most plain bolts,other than structural,will have the grade 8 markings on them.Ours are grade eight or better,and that's the way that they're indicated on our website,as grade 8 or better,and you will see the grade 8 slashes on the head.
The most common grading system used for bolts in the U.S.is the SAE system,but you can find metric grading systems as well.There are several grades of bolts but the three common grades for SAE are 2,5 and 8.The common class (grades) for metric are 5.8,8.8,File Size 1MBPage Count 1STANDARD BOLT IDENTIFICATION MARKINGSSTANDARD BOLT IDENTIFICATION MARKINGS.Proof Load (psi) Yield Strength Min (psi) Tensile Strength Min (psi) Low or Medium Carbon Steel 1/4 THRU 1 ½ 33,000 36,000 LowCarbon Steel 14 thru 4 SAE J429 Grade 2 Low or Medium Carbon Steel 14 thru 34 Over 34 thru 1 ½ 55,000 33,000 57,000 36,000 74,000 60,000.No Grade Mark.General description of Stud Bolts and Hex Bolts used in The height of a nut for a Stud Bolt is the same as the diameter of the thread rod Materials for Stud Bolts.Dimensions from Stud Bolts are defined in the ASME B16.5 standard.The material qualities for studs are defined in the different ASTM standards,and are indicated by Grade.Frequently used grades are A193 for thread rods and A194 for the
A grade 8 bolt is stronger than the more commonly used grade 5.It is made of alloy steel and has six radial lines on the top of the bolt head.Grade 8 bolts have a tensile strength of 150,000 pounds per square inch.We recommend using grade 8 nuts,flat washers and high alloy lock washers with any grade 8 bolts / hex cap screws.Grade Identification Markings for Nuts - Québec Boltsof Bolt (A) Finish (B) Size (In.) Recommended (C) Heavy Hex ASTM A307 Plain 1/4 to 1-1/2 Grade A Hex Nut A,C,DH Grade A Zinc Coated over 1-1/2 to 2 Grade A Heavy Hex Nut C,DH over 2 to 4 Grade A Heavy Hex Nut C,DH ASTM A307 Plain 1/4 to 1-1/2 Grade A Heavy Hex Nut C,DH Grade B Zinc Coated over 1-1/2 to 2 Grade A Heavy Hex Nut C,DHGrades and Classes of Nuts,Bolts Fasteners - What's the What do the markings on bolts mean? Imperial Grades.There are two main grading systems in the US that use imperial diameters.The American Society for Testing and Materials (ASTM) system,and the Society of Automotive Engineers (SAE).They both use numbers to grade their bolts - the higher the number,the higher the tensile strength.
1 Inch Latch Bolt Can withstand 10 strikes of 75 pounds of force (150 foot-pounds).Grade 2 A mid-grade lock for a mid-grade price -- usually used on residential doors.Tested to withstand 800,000 opening and closing cycles.5/8 Inch Latch Bolt Can withstand 5 strikes of 75 pounds of force (120 foot-pounds).Grade 3How to Identify Grade 8 Bolts DoItYourselfPosition the magnet in the pile of bolts that you want to classify.The bolts that are not attracted to the magnet are Grade 8 bolts.Look for Bolt Markings.If you do not have a magnet you can still identify Grade 8 bolts by brushing the head of the bolt using a wire brush and counting its radial lines.There are six radial lines on the heads of Grade 8 bolts.Length is measured from under the head.IDENTIFICATION GRSPECIFICATIONFASTENER DESCRIPMATERIALNoGradeMarkSAE J429 Grade 1Bolts,Screws,StudsLow or Medium CarboNoGradeMarkASTM A307 Grades ABolts,Screws,StudsLow Carbon SteelNoGradeMarkSAE J429 Grade 2Bolts,Screws,StudsLow or Medium CarboNoGradeMarkSAE J429 Grade 4StudsMedium Carbon Cold 51 rows on americanfastenerStrength and Grades of Fasteners QuadratecJan 07,2017·Of course,matching grades of nut and bolt/stud must be used together.Note that many manufacturers (e.g.Caterpillar,Bowman) manufacture bolts to specifications that exceed those for SAE Grade 8 bolts.These fasteners (Figure 7) are often marked in a similar fashion to SAE graded hardware by means of dashes embossed on the head of the bolt.
Location 6331 Cullen Blvd,Houston,77021,TXPhone (713) 747-3924Frequently Asked Questions on Bolting Matters - Bolt Science
conform to the ASTM A307 Grade A standard.The bolt head shown at the side indicates that it is of property class 8.8 and ML is the manufacturer's mark.Both marks are usually located onMarks USAMARKS USA has become a leading proponent of Value Engineered solutions on a wide array of high-end projects.While offering their clientele tremendous savings on locksets,both during bidding as well as during order placement,the result is increased business volume for their customers.Structural Bolting Structural Bolting A325 bolts require a washer under the element (head or nut) being turned to tighten the bolt (shown under the nut,above right) A490 bolts require a washer under both the head and nut (AISC NISD2000) Washers 7 Grip is the distance frombehind the bolt head to the back of the nut or washer
Turn-Of-NutAlternative Design BoltsWasher ControlCalibrated Wrench MethodThis method involves tightening the fastener to a low initial snug tight condition and then applying a prescribed amount of turn to develop the required preload.The actual preload will depend on how far the nut is turned as well as how much preload was established prior to the turning.1.Snug the joint to bring the assembly into firm contact.Apply a few impacts with impact wrench until solid sound or apply full effort with a spud wrench.2.Inspect the joint to verify snug tight.3.Match mark bearing face of the nuSee more on fastenalMetric Steel Bolts - Grades and Property ClassesSteel Bolts - Metric Grades ; Steel Bolts - SAE Grades ; For metric bolts strength is according ISO 898 Mechanical properties of fasteners made of carbon steel and alloy steel described by property classes with designations 4.6,4.8,5.8,8.8,9.8,10.9 and 12.9.Structural Bolts Feb-26-09 DONE - FastenalASTM A325 bolts are available in diameters from ½ to 1-1/2 inch diameters (for diameters greater than 1-1/2,ASTM A449 specifications should be considered) with a minimum tensile strength of 120,000 PSI for diameters one inch and less and 105,000 PSI for sizesTech 101 - Identifying and replacing automotive hardware Nov 22,2013·Larger sizes up to 1-1/2 inches have a yield strength of 36,000 PSI and a tensile strength of 60,000.Most automotive hardware is Grade 5 rated and is identified by three radial lines on the head of the bolt.They are made from a medium carbon steel that is quenched and tempered.
US BOLTS(HEAD MAUS BOLTS(GRADE AUS BOLTS(NOMINAUS BOLTS(MECHANINo MarkingsGrade 2 Low or mediu1/4 thru 3/455,000No MarkingsGrade 2 Low or mediuOver 3/4 thru 1-1/233,0003 Radial LinesGrade 5 Medium carb1/4 thru 185,0003 Radial LinesGrade 5 Medium carbOver 1 thru 1-1/274,000 23 rows on boltdepotBolt Grades
First,you need to be able to identify bolts by the different grades when you go to the local hardware store.Grade 5 bolts have 3 marks or lines on the head that are in the shape of a Y.Grade 8 bolts have 6 marks on the head.Second,the different grades have a meaning to them.It tells you how strong the fastener is.There areUnderstanding Fastener Grades and Classes - Fastener MartSpecial markings on screw heads and nuts identify the fastener's grade.Replace a graded fastener with same or higher grade (don't replace a Grade 8 fastener with a Grade 5 or 2).If in doubt,ask a professional for assistance.The chart below summarizes some of the more common grades and classes available here at Fastener Mart.WHAT GRADE BOLT SHOULD I USE? Marks BoltsApr 05,2019·In the metric world (a.k.a.ISO) the most common bolts are marked with an 8.8,10.9,or 12.9.If there are no head markings at all,they are most likely comparable to the SAE grade 2.The 8.8 is comparable to the SAE Grade 5.The 10.9 is comparable to the SAE Grade 8.The 12.9 is comparable to the SAE allen head.
May 26,2016·In the metric world (a.k.a.ISO) the most common bolts are marked with an 8.8,10.9,or 12.9.If there are no head markings at all,they are most likely comparable to the SAE grade 2.The 8.8 is comparable to the SAE Grade 5.The 10.9 is comparable to the SAE Grade 8.The 12.9 is comparable to the SAE allen head.What Are the Different Grades of Bolts? HunkerThe SAE marking standard starts with grade 2,indicated by a bolt head with no markings whatsoever.A grade 2 bolt made of low-carbon steel has a tensile strength of 64,000 pounds per square inch or less.Tensile strength is the amount of pull the bolt can withstand before breaking.What Steel Grade Should I Use? Metal SupermarketsJul 20,2015·What Steel Grade Should I Use? Category Steel,Hints and Tips,Video.Posted July 20,2015.Steel is a common metal used for both industrial and non-industrial applications.In most cases,it can be difficult to choose the correct Steel grade for your intended application.If your project does not have any physical or structural
Jul 03,2013·The result is an exterior-grade wood that's ideal for building decks,fences,sheds,picnic tables,swing sets,and other outdoor projects. screws,bolts