ASTM A194 Grade 2H
Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or both.
ASTM A194 specification covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1/4 through 4 in. and metric M6 through M100 nominal. It also covers austenitic stainless steel nuts in the size range 1/4 in. and M6 nominal and above. These nuts are intended for high-pressure or high-temperature service, or both.
ASTM A194 Grade 2H Nut Grades
| Grade | Tensile Class | Raw Material |
|---|
ASTM A194 Grade 2H Chemical Components
| Grade | Material | UNS Number |
C, % | Mn, % | Ph, % | S, % | Si, % | Cr, % | Ni, % | Mo, % | Ti, % | Cb & Ta, % | N, % | Other Elements, % |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2H | Carbon | 0.40 min | 1.000 | 0.040 | 0.050 | 0.400 | - | - | - | - | - | - | - |
ASTM A194 Grade 2H Hardness Requirement
| Grade & Type | Brinell Hardness | Rockwell Hardness | |
|---|---|---|---|
| C Scale | B Scale | ||
| 2H | 248-327 | 24-35 | - |
| 2H | 212-327 | 35 max | 95 min |
ASTM A194 Grade 2H Proof Load (Inch Series)
| Nominal Size, inch | Threads per inch | Stress Area inch | Proof Load, lbf | |
|---|---|---|---|---|
| Grade 2H | ||||
| Heavy Hex | Hex | |||
| 1/4" | 20 | 0.0316 | 4770 | 4300 |
| 5/16" | 18 | 0.0524 | 7860 | 7070 |
| 3/8" | 16 | 0.0774 | 11620 | 10460 |
| 7/16" | 14 | 0.1063 | 15940 | 14350 |
| 1/2" | 13 | 0.1419 | 21280 | 19160 |
| 9/16" | 12 | 0.1820 | 27300 | 24570 |
| 5/8" | 11 | 0.2260 | 33900 | 30510 |
| 3/4" | 10 | 0.3340 | 50100 | 45090 |
| 7/8" | 9 | 0.4620 | 69300 | 62370 |
| 1" | 8 | 0.606 | 90900 | 81810 |
| 1 1/8" | 8 | 0.7900 | 118500 | 106700 |
| 1 1/4" | 8 | 1.0000 | 150000 | 135000 |
| 1 3/8" | 8 | 1.2330 | 185000 | 166500 |
| 1 1/2" | 8 | 1.492 | 223800 | 201400 |
ASTM A194 Grade 2H Marking
| Grade Type | Hot Forged or Cold Punched Nuts | Nuts Machined from Bar Stock |
|---|---|---|
| 2H | 2H | 2HB |
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