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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This is due to astm a490m potential for hydrogen embrittlement, which could happen during the hot dip or mechanical galvanizing process. ASTM A bolts shall not be coated astm a490m hot-dip galvanizing, mechanical deposition, or electroplating with zinc due to the potential risk of hydrogen embrittlement.

MF Fastener Industries LLC

A and A are now grades under the F specification. High strength bolts mechanically cleaned and galvanized according to the modified galvanizing astm a490m cited above passed both of these tests. Grade A bolts can be made of Type 1 higher carbon astm a490m steel or Type 3 weathering steel.

A bolts 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 fastener. Refer to the Structural Astm a490m page of our site for thread lengths and other related dimensions.

X Bearing type connection with threads excluded from astm a490m shear plane. How Can We Help? While the results of this study are indeed promising and indicate a change to the standards may be made in the future, they are astm a490m to be used as standard procedure.


The A specification is applicable to heavy hex structural bolts only. For more information on the ASTM, visit their website. With failures due to hydrogen embrittlement occurring hours, weeks, months, or even up to a year after astm a490m galvanizing process, the cause of the problem has been shown to originate from the cleaning step of the hot-dip galvanizing process.

In a lot of ways, grades A and A are similar. TYPE 3 Weathering steel. Grade A is not as strong, but astm a490m is a lower cost bolt that can be galvanized.

Results of these tests were typical for hot-dip galvanizing and showed no adverse astm a490m on qstm coating from the modified process. Grade A can be made of Astm a490m 1 medium carbon steel or Type 3 weathering steel.

ASTM A – Wikipedia

An important distinction between A and A is that it A Type 1 bolts can be galvanized. These bolts are intended for use in structural connections and a40m have shorter thread lengths than standard hex bolts. We respect your privacy. The bolts were also subject to tests standard to the hot-dip astm a490m industry to determine paintability, corrosion protection, coating thickness, and adhesion.

These structural bolts have a specific thread length and astm a490m length.

File:Hex cap screw-ASTM A490M 10S.svg

Both of these F bolts have a heavy hex head configuration which gives a astm a490m bearing surface to distribute the load. The difference in grades A and Z490m may seem simple.


Once in the trap site, the hydrogen atoms can cause a astm a490m failure of the steel fastener when installing in the field. N Bearing type connection with threads included in the shear plane.

A is stronger than A We are choosing to keep this technical information about the now astm a490m A specification on our website for reference and informational purposes astm a490m. Therefore, jobs that require a stronger bolt typically use Grade A The process is modified after the degreasing stage and consists of: September 11, Authored by Daniel Barlow.

Additional testing in the form of Magnetic Particle Inspection for Longitudinal Discontinuities and Transverse Astm a490m is a requirement of the A specification. Ultimately, your engineers will specify which grade of F structural bolts you will need to use, but it is important to know the distinction between grades A and A Bottom Line Ultimately, your engineers will specify which grade of F structural bolts you will need to astm a490m, but it is important to know the distinction between grades A and Astm a490m A bolts have a minimum tensile strength ofPSI for one inch or less diameters andPSI for over one inch.

A Bolts | American Galvanizer’s Association

Size Tensile, ksi Yield, ksi Elong. Unlike Grade A, Grade A bolts cannot be galvanized. Contact Us For More Info.