What is a Grade A nut?

Grade A nuts are used with low carbon steel heavy hex bolts. Grade 5 are used with medium carbon cap screws and bolts. Grade C nuts are recommended to be used with A325 structural bolts.

What is ASTM A449?

ASTM A449 is a medium strength bolt manufactured from heat-treated medium carbon or alloy steel. ASTM A449 is identical to ASTM A325 and SAE J429 grade 5 in terms of strength and chemistry. However, A449 is more flexible since it covers a larger diameter range and is not restricted by a specific configuration.

What does A194 mean?

The ASTM A194 specification covers carbon, alloy, and stainless steel nuts intended for use in high-pressure and/or high-temperature service. Unless otherwise specified, the American National Standard Heavy Hex Series (ANSI B 18.2. 2) shall be used.

What are the requirements for ASTM A563 grade nuts?

The ASTM A563 specification covers the chemical and mechanical requirements for carbon and alloy steel nuts used on bolts, studs, and externally threaded fasteners. The charts below address over tapping allowances for hot-dip galvanized nuts, grade marking requirements, and mechanical requirements.

What’s the difference between ASTM A563 and SA 563?

ASTM A563 specification covers the requirement for carbon and alloy steel nuts. ASTM A563 Grade A Nut has carbon in it the more carbon it is added, harder and stronger it gets when heat treated. But A563 Nut also becomes less ductile, which means it loses strength when deformed and isn’t as malleable.

How big is an ASTM A563 Portland bolt?

A563 Mechanical Properties Grade Style Size, in. Proof Load, ksi Proof Load, ksi Plain Galvanized A Hex 1/4 – 1-1/2 90 68 A Heavy Hex 1/4 – 4 100 75 B Heavy Hex 1/4 – 1 133 100

Can you substitute ASTM A194 grade 2H nuts?

This is important because some nut grades are not readily available in certain sizes and finishes. Additionally, the specification allows for the substitution of ASTM A194 grade 2H nuts in lieu of A563 grade DH nuts due to the lack of availability of grade DH nuts in nominal sizes 3/4″ and larger.