ASTM A194 Grade 7 nuts are carbon steel high tensile nuts used in low temperature applications predominantly in the oil, gas and petrochemical industries, used in conjunction with ASTM A320 L7 Studs or headed fasteners.
LoneStar Fasteners Europe hold various options of ASTM A194 7 Grade nuts offering a standard product with the supplementary requirements of ASTM A194 or bespoke manufactured to the additional requirements of API 20E BSL 1, 2 or 3.
ASTM A194 7: Forms
| LoneStar Manufacture | ||
| Imperial Nuts – Heavy and Normal Series – Including ANSI B18.2.2 | ✓ | |
| Metric Nuts – Regular and High types – Including DIN 934 H=D, ISO | ✓ | |
| Available with locking features | ✓ |
ASTM A194 7: Sizes and Threads
| LoneStar Manufacture | ||
| Metric Coarse | ✓ | |
| Metric Fine | ✓ | |
| Imperial UNC | ✓ | |
| Imperial 8UN | ✓ | |
| Imperial UNF | ✓ | |
| ACME | ✓ | |
| Metric sizes available | Up to M100 | |
| Imperial sizes available | Up to 4.00″ |
ASTM A194 7: Chemical Composition
| Carbon | 0.38-0.48 | % |
| Manganese | 0.75-1.00 | % |
| Phosphorus | 0.035 | % Max |
| Sulphur | 0.04 | % Max |
| Silicon | 0.15-0.35 | % |
| Chromium | 0.80-1.10 | % |
| Nickel | – | … |
| Molybdenum | 0.15-0.25 | % |
| Copper | – | … |
| Niobium | – | … |
| Titanium | – | … |
| Vanadium | – | … |
| Aluminium | – | … |
| Nitrogen | – | … |
ASTM A194 7: Mechanical Properties
| Proof Load | Hardness | Hardness | |
| Up to 4” Inc. | ASTM A194 Table 3 + 4 |
248-327 HB | 24–35 HRC |
Similar or Equivalent Standards
| AISI 4142 |
| AFNOR 42 CD 4 |
| DIN 42 Cr Mo 4 |
| B.S. 1506-621 GrA |
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