ASTM A194 Grade 43 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 L43 Studs or headed fasteners. It is mainly used for large diameter bolting, predominantly between 2 ½” and 4” diameter throughout the oil and gas industry in low temperature environments.
LoneStar Fasteners Europe hold various options of ASTM A194 43 Grade nuts offering a standard product with the supplementary requirements of ASTM A194 or bespoke manufactured to the additional requirements of API 20E BSL 2 or 3.
ASTM A194 43: 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 43: Sizes and Threads
| LoneStar Manufacture | ||
| Metric Coarse | ✓ | |
| Metric Fine | ✓ | |
| Imperial UNC | ✓ | |
| Imperial 8UN | ✓ | |
| Imperial UNF | ✓ | |
| ACME | ✓ | |
| Metric sizes available Up to M100 | Up to M100 | |
| Imperial sizes available Up to 4.00″ | Up to 4.00″ |
ASTM A194 43: Chemical Composition
| Carbon | 0.38 – 0.43 | % |
| Manganese | 0.60 – 0.85 | % |
| Phosphorus | 0.035 | % Max |
| Sulphur | 0.04 | % Max |
| Silicon | 0.15 – 0.35 | % |
| Chromium | 0.70 – 0.90 | % |
| Nickel | 1.65 – 2.00 | % |
| Molybdenum | 0.20 – 0.30 | % |
| Copper | … | … |
| Niobium | … | … |
| Titanium | … | … |
| Vanadium | … | … |
| Aluminium | … | … |
| Nitrogen | … | … |
Mechanical Properties
| Proof Load | Hardness | Hardness | |
| Up to 4” Inc. | ASTM A194 Table 3 + 4 |
248-327 HB | 24-35 HRC |
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