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). Heavy Hex Structural Bolts – ASTM AM. Metric Series – Dimensions. Note: 1. The Bolts will generally conform to ANSI BM – Metric Heavy Hex.

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We have strict quality control from producing to delivery. This page was last edited on 28 Septemberat Calibrated wrenches can be set to stall at a specified torque thereby achieving the correct amount of bolt tension.

ASTM A325M Specification

When designing slip-critical connections it is very important that the fastener be tightened such that the bolt is in a slightly yielded condition. With the exception of the calibrated wrench method where the stall speed is set, the tension in the bolt is not directly measured.

High strength bolts with large hexagon head for steel structures Suppliers 3. For products in stock, we can ship it within asstm days after receiving your payment.

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 the bolt is tightened to the proper load, the right end of the bolt shank snaps off.

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 a325k steel.


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Astm Am Bolts, Astm Am Bolts Suppliers and Manufacturers at

The paint or chalk mark shows how far the part has rotated and the rotation is always measured relative to the rotation of the bolt. There are also three connection types defined: Metric high strength large hexagon head bolts. The procedure generally works as follows.

High strength hexagon bolts for friction asfm joints Suppliers 1. Both USCU and metric fasteners are marked so that iron workers and inspectors can quickly and easily verify that they are using the correct type of fastener e. To ensure the trace of the product quality, all our production processes are controlled by bar code. Hexagon head bolts with hexagon nut for steel structures Suppliers 1.

ASTM A – Wikipedia

An iron worker tightens the bolt and nut as tight as possible using a spud 3 wrench or a pneumatic impact wrench. 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 critical to the performance or safety of the structure. The tapered handle is similar to a sailor’s marlin spike and is used to jamb into a series of holes to help align the holes before inserting the bolt. Hexagon bolts with large width across flats for high strength structural bolting.

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You can ensure product safety by selecting from certified suppliers, including 67 with ISO, 22 with Other, and 3 with ISO certification. As the bolt is tightened the groves on the washer flatten out. Hot selling structural zinc plated carbon steel hexagon astm A hex bolt nut. Generally it is days if the goods are in stock. An ironworker would simply keep tightening the bolt until the tip breaks off and an inspector could easily verify that the a32m was properly tighten by ensuring that the tip is missing.


A bolts are intended to be a35m to nearly their proof load so that they develop significant bolt tension. The standard currently defines two types, however it previously defined the following three: Metric heavy hex structural bolts.

Unfortunately, calibrated wrenches need to a325k calibrated at least every day since they tend to lose their calibration relatively quickly. Q 3 Can I get free samples9 A: High strength large hexagon bolts for steel structure. The bolt is tightened further by either hammering on the spud wrench or using a pneumatic impact wrench until the rotating part has rotated the asrm amount.

astm a325m bolts

These of larger dimensions are referred to as “heavy hex” geometry. In fact, it is not necessary to be too careful about achieving some specific amount of tension as long as the bolt is in the yielded condition.

These bolts use the same material as their common cousins ASTM FM for metric boltsbut have a thicker and wider head to more effectively distribute the load. Except for bolts smaller than 5 mm, all bolt heads are marked such that the property class is easily determined as shown in the figure below.

System HV-Hexagon bolt with large width across flats and nut assemblies. Retrieved from ” https: Astm f tc bolts for steel structure.