Metric bolt grades pdf

Metric bolt grades and strength calculator to show proof strength, tensile strength, vickers brinell hardness, minimum breaking torque and stress area of metric bolts and screws made of carbon steel and alloy steel with designations 4. Always match bolts and nuts of comparable grades use a grade 8 nut with a grade 8 bolt. Grade b bolts have looser tolerances and can be manufactured in a cold or hotforging process. If the pitch is the normally used coarse pitch listed in iso 261 or iso 262, it can be omitted e. This edition has been technically revised and introduces the designation of product grade c in place of. Contact american fastener with any questions or for a custom quote.

Metric bolt grade mechanical requirements for carbon steel. The grade 5 fastener has already reached its ultimate load and failed before the grade 8 starts to yield or stretch. Lubricate all contact areas of the bolts and washers. A comprehensive catalogue of unbrako socket screws and related. Mechanical properties proof loadpsi yield strength min psi tensile strength min psi nogrademark sae j429 grade 1 bolts, screws, studs low or medium carbon. Head marking class and material nominal size range mm mechanical properties. Mechanical properties and identification markings for threaded. The standard metric fastener thread series for general purpose threaded components is the m thread profile and the coarse pitch thread series. Steel grade sae 5 sae 8 socket head cap screws property class 8.

Metric pitch threads per millimeter metric fasteners can also have extra fine pitch thread head markings inch head markings metric xx grade 5 cap screw grade 5 nut grade 8 nut xx grade 8 cap screw xx 8. The torque figures quoted have been based on a theoretical bolt load equal to 85% of the proof load of the bolting material. Metric and imperial standard bolt torques standardtorques. Minimum ulitmate tensile loads3 iso metric coarse standard pitch thread. Grade5 is identified by three bars on the head and grade8 by 6 bars on the. Details of the software products used to create this pdf file can be found in the general info relative to the file. Nov 19, 20 strength grades for metric fasteners are designated by a symbol comprised of 2 numbers, separated by a decimal. These calculations are in metric units, the torque program can also work in units of inches and pounds and work with the unified thread form.

Pdf iso metric black hexagon bolts, screws and nuts. Iso 8981 is applicable to bolts, screws and studs made of carbon steel or alloy steel, having triangular iso metric screw thread in accordance with iso 681 with. Torque values chart for common bolt sizes intpi1 n m2 ftlb3 n m ftlb n m ftlb mm x pitch4 n m ftlb n m ftlb n m ftlb 14 20 7. Grade 5 bolt capability in tension failure 120,000 lbs in2 x. Bolts, screws and studs 4017 hexagon head screwsproduct grades a and b 1110 iso metric hexagon head bolts and screwsproduct grades a and b this is a free 9 page sample.

Bolt grades torque specs cahart industrial metal supply. Performance data listed are for standard production items only. For example, m10 or m106g, by default, specifies m10 x 1. Grade identification markings inch steel bolts grade marking specification description material nominal size inches proof load psi tensile strength min psi yield strength min psi rockwell hardness min max sae j429 grade 1 bolts, screws, studs low or medium carbon steel 14 1 12 33000 60000 36000 b70 b100 sae j429 grade 2 bolts. Astm, sae and iso grade markings for steel fasteners. In this video you will know about bolt grades or fa. Except for the very lowest grades, metric nuts and bolts all carry identification markings which indicate their strength. Astm a307 grade a sae j429 grade 5 sae j429 grade 8 f n l g 9 fnl grade 9 clamp load lbs. The first number represents 1100 of the nominal tensile strength in nmm2. Table of design properties for metric steel bolts m5 to m39.

Bolts are also specified for strength, known as grade for sae or class for metric. Table of design properties for metric hexagonal bolts steel properties fy, fu for 4. Imperial grades ibfin2 psi metric classes mpa nmm2 l9 180,000 psi high tensile. Where the proof load is not quoted in the specification this has been taken as 95% of the yield stress.

Identification grade mark specification fastener description material nominal size range in. Applications advantages has greater tensile strength than class 4. In preparation of this standard assistance has been derived from din 5291986 masonry and foundation bolts issued by deutsches institut fiir normung din. Bolt sciences torque program example calculation metric.

The metric system designates strength capabilities via property classes rather than grades. In metric bolts there are 3 commonly used classes, 8. Length is measured from under the head to the end of the bolt note. Material, nominal size range mm, mechanical properties. Grade a bolts are the preferred style for most applications. Download a complimentary pdf of our fastener markings chart. Some notes from iso 898 metric screw threads standards. 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.

A hex bolt with metric thread pitch made from medium carbon steel and heattreated. Metric bolt grade markings and steel strength chart. Standard metric bolt dimensions and grades metric m8 1. Iso metric screw threads are designated by basic diameter and thread pitch.

Hex bolts, or hex cap screws, are used in machinery and construction. Table 8 strength grade designations for steel nuts strength grade designation 4 6 8 10 12 proof load stress nmm2 400 600 800 1 000 1 200 16. Torque tightening analysis results example calculation for a m12 bolt. Fastener technical data and charts section kl jack. Metric nuts are marked with a single or double numerical symbol 8, 10 or 12. Pack qty 45 50 55 60 653805438055 38163 37335 37325 37336 37337 5 5 5 5 5 asnzs 11101995 iso 4014 1999 hexagon bolt metric property class 8. On the head of each bolt are two numbers separated by a decimal point, the full list includes ten grades from 3. Metric nuts and bolts thomsonrail total rail solutions. Grade 5 per sae j429, zincclear plated per astm b633. Product material and treatment tensile yield strength, nmm2 tensile ultimate strength, nmm2 surface, max prod. Externallythreaded fasteners metric series property class.

Metric bolt torque specifications lbsft bolt grade 8. They were one of the first international standards agreed when the international organization for standardization iso was set up in 1947. Grade 8 bolts, screws, studs medium carbon alloy steel, quenched and tempered 14 thru 112 120,000,000 150,000 astm a354 grade bd alloy steel, quenched and tempered4 no grade mark sae j429 grade 8. There are also lower grade metric bolts which should be avoided. Service manual supplement july 2016 fastener torque specifications 4 sae and metric fastener torque specifications sae plain and zinc plated hex and socket head cap. The iso metric screw thread is the most commonly used type of generalpurpose screw thread worldwide. Threaded fastener grades part 1 20110326 auto service. Presented below are the results from torque for a m12 grade 8. This standard is part 1 of a twopart series on iso metric hexagon bolts and screws. Nonstock items may vary due to variables in methods of manufacture. Grade 7 bolts, screws medium carbon alloy steel, quenched and tempered4 14 thru 112 105,000 115,000 3,000 sae j429 grade 8 bolts, screws, studs medium carbon alloy steel, quenched and tempered 14 thru 112 120,000,000 150,000 astm a354 grade bd alloy steel, quenched and tempered4 no grade mark sae j429 grade 8. Choose from our selection of metric bolts in a wide range of styles and sizes. A metric iso screw thread is designated by the letter m followed by the value of the nominal diameter d the maximum thread diameter and the pitch p, both expressed in millimetres and separated by the hyphen sign, e. Head markings metric bolt class mechanical properties proof load mpa min yield mpa min tensile strength mpa class 8.