ASTM A194 Standard Specification for Carbon Steel, Alloy Steel, and Stainless Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both
Grade Symbol: 2H
Material: Carbon
Chemical Requirements (Composition, %)
C: ≥0.40
Mn: 1.00
P: ≤0.040
S: ≤0.050
Si: 0.40
Hardness Requirements
| Type | Brinell Hardness | Rockwell Hardness | |
| to 1-1/2 in. or M36, incl | 248 to 327 | 24 to 35 | … |
| over 1-1/2 in. or M36 | 212 to 327 | 35 max | 95 min |
Minimum Tempering Temperature, [°C] 455
