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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There is also a T version, which is used to refer to fully threaded bolts. Type 1 — a general-purpose medium carbon steel materials, Type 2 — a low-carbon martensite steel for atmospheric temperature applications, and Type 3 — a weathering steel suitable for use with sections or plate made using ASTM A weathering steel. These bolts use the same material as aastm common cousins ASTM FM for metric boltsbut have a thicker and wider head to more effectively distribute the load.

Note that independent of the material the bolt is quenched and tempered.

Views Read Edit View history. Since there is only one pitch per diameter, it is common to refer to metric bolts only with the nominal diameter, for example M24 or M Large hex bolts for structural bolting with large width across flats – short thread. By using this site, you agree to the Terms of Use and Privacy Policy.


A and A heavy hex structural bolts are now grades under the new F specification. Carbon Steel Boltsretrieved Hexagon bolts for structural bolting with large width across flats.

There are four basic methods for making sure a bolt have the proper amount of tension: High-strength structural bolting saaemblies for preloading-Part 4: High-strength structural bolting saaemblies for preloading-Part 7: High strength bolts with large hexagon head for steel structure.

High strength large hexagon bolts for steel structure. The nuts selected for a particular application must match the bolt for both material type and geometry.

Maryland Metrics: Metric ASTM Structural Fasteners

Metric Heavy Hex Structural Bolts. The term “spud” wrench is a contribution of Irish-American iron workers. Hexagon bolts with large widths across flats for steel structures. atm

If the bolt is s325m tightened it will probably break in which case the iron worker simply needs to remove the broken bolt and install a new one. If the bolt tension is too large, the bolt may break.

ASTM A325M Specification

The number of turns past snug is dependent on the length xstm the bolt relative to its diameter and the geometry of the two surfaces. High-strength structural bolting saaemblies for preloading-Part 3: Hexagon head bolts with hexagon nut for steel structures Suppliers 1.

These bolts are often referred to as “common” bolts, “unfinished” bolts or “rough” bolts. Unfortunately, calibrated wrenches need to be calibrated at least every day since they tend to lose their calibration relatively quickly.


The most commonly used bolts in the USCU system were A bolts also called “common” or “unfinished” bolts and A bolts although A and A bolts are also sometimes used.

ASTM A/AM Type 3 Bolts, Stud Bolts, Threaded Rods

The minimum tensile strength and the minimum bolt installation tension are shown in the table below.

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. AM bolts are manufactured using material with a minimum yield strength of MPa and a minimum ultimate strength of MPa. Heavy hex bolts Suppliers 2. Customary Unit Fasteners Although metric fastener standards have been available in the US for more asrm 20 years, metric structural bolting is still not asm implemented in the United States.

AM bolts have thicker and wider heads to more effectively distribute the head load to the piece and shorter shanks to keep the threads out of the load bearing part of the bolt. Direct Tension Indicator Method Direct tension indicators are special washers with grooves on one face. From Wikipedia, the free encyclopedia. Heavy Hex Structural Bolts.

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