Medium carbon alloy steel in accordance with ASTM AM. ASTM AM. Heavy Hex Structural Bolts (Metric) Approved: M.R. Tiddy. Page: 1 of 7. AM Bolt. 3 Jul Manufacturing High Strength Structural Heavy Hex Bolts as per ASTM AM specification in metric and imperial sizes with Zinc, Galvanized or. ASTM A M– min Heat Analysis. NY ASTM A M. min Nickel.3 ISO Standards:4 Hexagon Bolts for High Strength Structural Bolting.

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N Bearing type connection with threads included in the shear plane.

Therefore, jobs that require astm a490m stronger bolt typically use Grade A A is stronger than A However, the customer must be made aware this modified process is not currently in compliance with Astm a490m standards. The astm a490m in grades A and A may seem simple. The process is modified after the degreasing stage and consists of: TYPE 2 Withdrawn in September 11, Authored by Daniel Barlow.

These structural bolts have a specific thread length and shank length.

SC Slip critical connection. Refer to the Structural Bolts page astm a490m our site for thread lengths and other related dimensions. Ultimately, your engineers will specify which grade of F astm a490m bolts you will need to use, but it is important to know the distinction between grades A and Aastm High strength bolts mechanically cleaned and galvanized according to the modified galvanizing process cited above passed both of these tests.

We are choosing to keep this technical information about the sstm obsolete A specification on our website for astm a490m and informational purposes only.


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With failures due to hydrogen embrittlement occurring hours, weeks, months, or even up to a year after the galvanizing process, the cause of the problem has been shown to originate from the cleaning step of zstm hot-dip galvanizing process. The threaded section of the bolt is the weakest, thus a longer shank length makes for a stronger tensile connection. Contact Us For More Info. Therefore, removing the source aztm hydrogen astm a490m pickling acids from the galvanizing process astm a490m eliminates the concern for hydrogen embrittlement failure.

ASTM A – Portland Bolt

astm a490m Results of these tests were typical for hot-dip galvanizing and showed no adverse effect on the coating from the modified process. These bolts are intended for use in astm a490m connections and therefore have shorter thread lengths than standard hex bolts.

ASTM F Grades A and A are two of the main types of structural bolts we sell, and they are the two you will most often see on a jobsite. Astm a490m A is not as strong, but it is a lower cost bolt that can be galvanized.

Both of these F bolts have a heavy hex head astm a490m which gives a larger bearing surface to distribute the load. Grade A is stronger than Grade A, but it cannot be hot dip or mechanical galvanized.

ASTM AM Type 1 & Type 3 Heavy Hex Structural Bolts

The A specification is applicable to heavy hex structural bolts only. The bolts were also subject to tests standard to the hot-dip galvanizing industry to determine paintability, corrosion protection, coating astm a490m, and adhesion.

For more information on the ASTM, visit their website. ASTM A bolts shall not be coated by hot-dip galvanizing, mechanical deposition, or electroplating with zinc due to the potential risk of hydrogen embrittlement. In structural bolting applications, astm a490m allows the bolt’s threads to not be in the shear plane where the two astm a490m meet up. Once in the trap site, the hydrogen atoms can cause a premature failure of the steel fastener when a4990m in the field.


This makes them weaker than A, certain jobs do not require a structural bolt asgm strong as Grade A This blog is for informational astm a490m only.

MF Fastener Industries LLC

A astm a490m are similar in application and dimensions to A heavy hex structural bolts but are made from an alloy steel rather than a medium carbon steel, resulting in a higher strength astm a490m.

While the results of this study are indeed promising and indicate a change to the standards may be made in the future, they are not to astm a490m used as standard procedure. The time the steel spends immersed in the pickling acids must be eliminated as this is the only source of hydrogen atoms in the galvanizing process.

If a customer wants to hot-dip galvanize high strength bolts, results from this study can be astm a490m to reach an agreement.

astm a490m high strength steel bolts

In a lot of ways, grades A and A are similar. How Can We Help? An important distinction between A astm a490m A is that it A Type 1 bolts can be galvanized. TYPE 3 Weathering steel.