ASTM A194 Grade - 8M

ASTM A194 Grades

Mechanical properties of Nuts made of carbon steel and alloy steel Grade 8M

The Grade 8M Carbon and Alloy Steel Nuts for Bolts of High Pressure or High Temperature Service

The ASTM A194 Grade 8M 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. Nuts up to and including 1-inch nominal size shall be UNC Series Class 2B fit. Nuts over 1-inch nominal size shall be either UNC Series Class 2B fit or 8 UN Series Class 2B fit. High strength ASTM A194 grade 8M nuts are common in the market place and are often substituted for ASTM A563 grade DH nuts due to the limited availability of DH nuts in certain diameters and finishes.

ASTM A194 Grade 8M
8M Carbon steel Hex Nut, Heavy hex nut
ASTM A194 Grade 8M Chemical properties

Property class

Chemical composition

C.

Mn.

Si.

P.

S.

Cr.

Ni.

Mo.

V.

Ti.

8M

0.08

2.00

1.00

0.045

0.030

16.00-18.00

10.00-14.00

2.0-3.0

-

-

ASTM A194 Grade 8M Hardness properties Inch Product

Class

Diameter, [mm]

Brinell

Hardness

Rockwell Hardness

C Scale

B Scale

8M

All

126-300

32 max

60 min