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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High-strength structural bolting saaemblies for preloading-Part 4: Heavy hex bolts Suppliers 2.

Large hex bolts for structural bolting with large width across flats – short thread. High strength large hexagon bolts for steel structure.

ASTM A325M Specification

A325 iron worker tightens the bolt and nut as tight as possible using a spud 3 wrench or a pneumatic impact wrench. The standard currently defines two types, however it previously defined the following three: A mm diameter bolt with a 3-mm pitch is designated as an M24x3 bolt, the M indicating that this is a metric bolt. Customary Unit Fasteners Although metric fastener standards have been available in the US for more than 20 years, metric structural bolting is still asstm fully implemented in the United States.

ASTM bolts can be considered equivalent to Grade 8. An iron worker or inspector aztm 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.


The term “spud” wrench is a contribution of Irish-American iron workers. Metric Heavy Hex Head Bolts. The nuts selected for a particular application must match the bolt for both material type and geometry.

The sections that follow show the metric head markings and the aztm below shows the markings for the most common types of USCU structural bolts. By using this site, you agree to the Terms of Use and Privacy Policy.

A bolts are intended to be tightened to nearly their proof load so that they develop significant w325m tension. Calibrated Wrench Method Most iron workers use pneumatic power wrenches, also called impact wrenches, to tighten bolts.

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.

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.

ASTM A325/A325M Type 3 Bolts, Stud Bolts, Threaded Rods

From Wikipedia, the free encyclopedia. This page was last edited on 28 Septemberat The proof loads and tensile strengths of Class 4. Such bolts might, for example, be used in q325m roof truss made up of angle sections in an industrial building or to connect brace members to main structural members.

The turn-of-the-nut method is the easiest and least expensive method for installing fasteners with the proper bolt tension. With the exception of the calibrated wrench method where the stall speed is set, the tension in the bolt is not directly measured.


There are also three connection types defined: Note that independent of the material the bolt is quenched and tempered. It defines mechanical properties for sizes M12— Retrieved from ” https: Hexagon nuts -Black, Heavy style.

The tapered handle is similar to asmt sailor’s marlin spike and is used to jamb into a series of holes to help align the holes before inserting the bolt. System HR-Hexagon bolt with large width across flats and nut assemblies.

High strength bolts for joints of space grid structures. The type refers to the type of material used to make the bolt. Technically they are not really structural bolts at all but are included here because they are often used in bearing connections where the loading is not large or is not zstm to the performance or safety of the structure.

ASTM A – Wikipedia

High-Strength Steel Bolts Suppliers 1. These of larger dimensions are referred to as “heavy hex” geometry. 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 Hexagon head bolts with hexagon aastm nuts for steel structure Suppliers 1.