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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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. Hot selling structural zinc plated carbon steel hexagon astm A hex bolt nut. High strength large hexagon bolts for steel structure.

High Strength Heavy Hex Bolts.

ASTM AM Structural Bolts, Stud Bolts, Threaded Rods

Hexagon bolts for structural bolting with large width across flats. Steel structure with high torsional shear strength hexagon head bolts. High strength bolts with large hexagon head for steel structure. Calibrated Wrench Method Most iron workers use pneumatic power wrenches, also called impact wrenches, to tighten bolts.

The proof loads and tensile strengths of Class 4. What is your terms of payment 9 A: This page was last edited on 28 Septemberat Direct Tension Indicator Method Direct tension indicators are special washers with grooves on one face.

High-strength structural bolting saaemblies for preloading-Part 3: Views Read Edit View history. A mm diameter bolt with a 3-mm pitch is designated as an M24x3 bolt, the M indicating that this is a metric asfm. Except for bolts smaller than wstm mm, all bolt heads are marked such that the property class is easily determined as shown in the figure below.


High strength hexagon bolts wstm friction grip joints Suppliers 1. Metric heavy hex head bolts. The Industrial Fasteners Institute publishes an excellent summary of all metric fastener specifications in its Metric Fastener A325mm.

Tension Indicating Bolts An indirect way to verify that a bolt has been properly tightened is to use tension indicating bolts like the one shown at the right. Astm f tc bolts for steel structure. There are also three connection types defined: Direct tension indicators are special washers with grooves on one face.

ASTM A – Wikipedia

For products in stock, we can ship it within 7 days after receiving your payment. We have strict atsm control from producing to delivery. Hexagon head bolts with hexagon head nuts for steel structure Suppliers 1. Bolts M20 Grade 8. Sample Order Free samples. Large size heavy hex screws. The standard currently defines two types, however it previously defined the following three: Large hex bolts for structural bolting with large width across flats – short thread.

Although AM bolts are made using A Class 8. Hardware Bolts Screws Nuts. If the bolt tension is too large, the bolt may break. This modified geometry is often referred to as heavy hex geometry. When designing slip-critical connections it is very important that the fastener be tightened such that the bolt is in a slightly yielded condition. They also receive various tests and inspections at the JM quality center before shipment.

High-strength structural bolting assemblies for preloading-Part 4: Every bolt head must be marked with the bolt type e. 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.


Hexagon nuts -Black, Qstm style. An iron worker tightens the bolt and nut as tight as possible using a spud 3 wrench or a pneumatic impact wrench. Type 1 — a general-purpose medium carbon steel materials, Type 2 — a low-carbon martensite steel for atmospheric temperature applications, and Axtm 3 — a weathering steel suitable for use with sections or plate made using ASTM A weathering steel. Note that independent of the material the bolt is quenched and tempered.

The sections that follow show the metric head markings and the figure below shows the markings for the most common types of USCU structural bolts.

High-strength structural bolting saaemblies for preloading-Part 4: High-Strength Steel Bolts Suppliers atsm. A chalk mark or paint is then made on the bolt and nut.

Hexagon bolts for high-strength structural bolting with large width across flats thread lengths according to ISO —Product grade C—Property classes 8.

ASTM bolts can be considered equivalent to Grade 8. System HV-Hexagon bolt with large width across flats and nut assemblies.

astm a325m bolts

The number of turns past snug is dependent on the length of the bolt relative to its asgm and the geometry of the two surfaces. Both USCU and metric fasteners are marked so that iron workers and inspectors can quickly and easily verify that they are w325m the correct type of fastener e.

If the bolt is over tightened it will probably break in which case the iron worker simply needs to remove the broken bolt and install a new one.