ASTM AM. Heavy Hex Structural Bolting Assemblies (Metric). (AM Bolt, AM Nut & FM Washer). T. R. U. C. T. U. R. A. L. TUNNEL. RAIL. ASTM AM: Standard Specification for Structural Bolts, Steel, Heat Treated MPa Minimum Tensile Strength (Metric). ASTM A/AM Type 3 is a grade specification for structural bolts, stud bolts, threaded rods made from carbon steel, covering requirements for chemical.

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The number of turns past snug is dependent on the length of the bolt relative to its diameter and the geometry of the two surfaces. High strength large hexagon bolts for steel structure.

These bolts use the same material as their common cousins A325j FM for metric boltsbut have a thicker and wider head to more effectively distribute the load.

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ASTM A325M Specification

The term “spud” wrench is a contribution of Irish-American iron workers. Hexagon bolts with large width across flats for high strength a25m bolting. These of larger dimensions are a325mm to as “heavy hex” geometry. An iron worker or inspector knows that the correct tension has been achieved when the gap between the washer and the piece will no long accept a gauge of a specified thickness.


ASTM bolts can be considered equivalent to Grade 8. Heavy hex structural bolts. Heavy Hex Structural Bolts. Such bolts might, for example, be used in a roof truss made up of angle sections in an industrial building or to connect brace members to main structural members. When designing slip-critical connections it is very important that the fastener be tightened asm that the bolt is in a slightly yielded condition.

The previous table shows the number of rotations for a variety of bolt lengths for flat horizontal surfaces. The bolt head are also marked with a manufacturers mark e. By using this site, you agree to the Terms of Use and Privacy Policy.

ASTM A – Portland Bolt

There are four basic methods for making sure a bolt have the proper amount of tension: Turn-of-the-Nut Method The turn-of-the-nut method is the easiest and least expensive method for installing fasteners with the proper bolt tension.

A and A heavy hex structural bolts are now grades under the new F specification.

Metric Heavy Hex Head Bolts. It defines mechanical properties for sizes M12— This modified geometry is often referred to as heavy hex geometry.

Hexagon head bolts with hexagon head nuts for steel structure Suppliers 1. Carbon Steel Boltsretrieved Metric heavy hexagon bolts. System HV-Hexagon bolt with large width across flats and nut assemblies. There are three types of AM bolts: Heavy hex bolts Suppliers 2. From Wikipedia, the free encyclopedia. The bolt is tightened further by either hammering on the spud wrench or using a pneumatic atm wrench until the rotating part has rotated the required amount.


Large size heavy hex screws. High-strength structural bolting saaemblies for preloading-Part 7: A chalk mark or paint is then made on the bolt and nut. The nuts selected for a particular application must match the bolt for both material type and geometry. Calibrated wrenches can be set to stall at a specified torque thereby achieving the correct amount of bolt tension. Show on Mobile terminal. The type refers to the type of material used to make the bolt. The values in the minimum installation strength column are 70 percent of the values in the tensile strength column a325j.

Customary Unit Fasteners Although metric fastener standards have been available in the US for more than 20 years, metric structural bolting is still not fully implemented in the United States.