Blog What is ASTM A563M?

What is ASTM A563M?

What is ASTM A563M?

ASTM A563M specification covers metric M1. 6 to M100 Carbon Steel & Alloy Steel Imperial Nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts. When properly exposed to the atmosphere, these steels can be used bare (uncoated) for many applications.

What is grade DH nut?

Nuts for Structural Applications—Grade DH. These nuts are designed to secure ASTM A325 bolts in structural joints. Also known as heavy hex nuts, they are about 10% wider and taller than standard hex nuts. Black-oxide steel nuts have a dark surface color and are mildly corrosion resistant in dry environments.

What is a Grade B nut?

Strength exceeds Grade 2. ASTM A325. Bolts meet ASTM A325 Type 1 standards for structural steel joints. Grade B Nuts. Strength is similar to Grade 5.

What grade is a A563 nut?


Grade Style Hardness, HBN
A Heavy Hex 116 – 302
B Heavy Hex 121 – 302
Heavy Hex 121 – 302
C / C3 Heavy Hex 143 – 352

What is the difference between 2H and DH nuts?

Both ASTM A194 Grade 2H nuts and ASTM A563 grade DH nuts are high strength nuts that undergo a heat treating process required to develop their strength characteristics. However, they are not necessarily interchangeable. An A194 Grade 2H nut can always be substituted for an A563 Grade DH nut.

Is grade A the same as Grade 2?

A2. A type of the most common stainless steel grade. It is comparable in strength to grade 2 materials, yet slightly weaker and easy to weld.

What does 2H mean on nuts?

nut formation
The grade 2H designation signifies nut formation, including the method of heat treatment, quenching, and temperature range required for tempering. Other markings are also found the same face, designating any plating or coatings applied to the fastener.