Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
ASTM A194 Grade 3 Heavy Hex Nuts — UNS S50100
Corrosion-resistant stainless steel nuts for industrial fastening applications.
ASTM A194/A194M Grade 3 Nuts are stainless steel heavy hex nuts widely used in industrial, marine, and fabrication environments. These nuts provide reliable corrosion resistance and long service life in demanding conditions. They are commonly combined with ASTM A193/A193M stainless steel stud bolts and ASTM A320/A320M low-temperature fasteners. ASTM A563M and ASTM F2437/F2437M specifications are also relevant in engineered fastening assemblies.
ASTM A194/A194M Gr 3 Chemical Requirements
| Grade | Description and UNS Designation |
C | Mn | P | SE | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|---|
| ASTM A194/A194M Grade 3 | (501) S50100 | 0.10 min | 1.00 | 0.040 | 0.030 | 1.00 | 4.0-6.0 | 0.40-0.65 |
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ASTM A194/A194M Gr 3 Hardness Requirements
| Grade and Type | Completed Nuts | Sample Nut after Treatment | ||
|---|---|---|---|---|
| Brinell Hardness | Rockwell Hardness | Brinell Hardness, min | Rockwell Hardness B Scale, min | |
| C Scale | ||||
| ASTM A194/A194M Grade 3 | 248 to 327 | 24 to 35 | 201 | 94 |
ASTM A194/A194M Gr 3 Proof Load Requirements (Inch Series)
| Nominal Size, in. | Threads per Inch | Stress Area in. 2 | Proof Load, lbf A | |
|---|---|---|---|---|
| Grade 3 | ||||
| Heavy HexF | HexG | |||
| 1/4 | 20 | 0.0316 | 5 570 | 4 770 |
| 5/16 | 18 | 0.0524 | 9 170 | 7 860 |
| 3/8 | 16 | 0.0774 | 13 560 | 11 620 |
| 7/16 | 14 | 0.1063 | 18 600 | 15 940 |
| 1/2 | 13 | 0.1419 | 24 830 | 21 280 |
| 9/16 | 12 | 0.182 | 31 850 | 27 300 |
| 5/8 | 11 | 0.226 | 39 550 | 33 900 |
| 3/4 | 10 | 0.334 | 58 450 | 50 100 |
| 7/8 | 9 | 0.462 | 80 850 | 69 300 |
| 1 | 8 | 0.606 | 106 000 | 90 900 |
| 11/8 | 8 | 0.790 | 138 200 | 118 500 |
| 11/4 | 8 | 1.000 | 175 000 | 150 000 |
| 13/8 | 8 | 1.233 | 215 800 | 185 000 |
| 11/2 | 8 | 1.492 | 261 100 | 223 800 |
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ASTM A194/A194M Gr 3 Proof Load Requirements (Metric Series)
| Nominal Size, mm | Threads Pitch | Stress Area mm 2 | Proof Load, kNA | |
|---|---|---|---|---|
| Grade 3 | ||||
| Heavy HexF | HexG | |||
| M6 | 1.0 | 20.1 | 29.2 | 20.8 |
| M8 | 1.25 | 36.6 | 44.1 | 37.9 |
| M10 | 1.50 | 58.0 | 69.9 | 60.0 |
| M12 | 1.75 | 84.3 | 101.6 | 87.3 |
| M14 | 2.0 | 115.0 | 138.6 | 119.0 |
| M16 | 2.0 | 157.0 | 189.2 | 162.5 |
| M20 | 2.5 | 245.0 | 295.2 | 253.6 |
| M22 | 2.5 | 303.0 | 365.1 | 313.6 |
| M24 | 3.0 | 353.0 | 425.4 | 365.4 |
| M27 | 3.0 | 459.0 | 553.4 | 475.1 |
| M30 | 3.5 | 561.0 | 676.0 | 580.6 |
| M36 | 4.0 | 817.0 | 984.5 | 845.6 |
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Related A194 Grades & References
Grade 3 is a 5Cr-0.5Mo alloy A194 nut for high-temperature service. For higher-strength alloy see Grade 7 / 7M (Cr-Mo, paired with A193 B7/B7M). For Cr-Mo-V high-temperature use Grade 16. For carbon-steel standard service use Grade 2H. Dimensions: ASME B18.2.2 heavy hex. Full specification: ASTM A194 PDF. A194 hub.
International Equivalents
| Standard | Region | Notes |
|---|---|---|
| ASTM A182 F5 (companion forging) | USA | 5Cr-0.5Mo forged flange standard |
| ASTM A199 T5 (companion tube) | USA | 5Cr-0.5Mo tube/pipe alloy |
| BS 1503 245 (5Cr alloy) | UK | British 5Cr-0.5Mo bolting alloy |
| DIN 1.7362 (X12CrMo5) | Germany | 5Cr-0.5Mo alloy steel |
| JIS SCM5 (5Cr) | Japan | 5Cr-0.5Mo Japanese alloy |
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