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 1 Heavy Hex Nuts — UNS K01503
Reliable carbon steel heavy hex nuts designed for general industrial bolting and piping applications.
ASTM A194/A194M Grade 1 Nuts are manufactured from carbon steel and are commonly used in conjunction with bolting assemblies for piping, valves, flanges, and pressure vessel applications. These heavy hex nuts provide dependable strength, machinability, and durability for industrial environments. They are frequently paired with specifications such as ASTM A193/A193M stud bolts for high-pressure applications, ASTM A320/A320M bolting for low-temperature service, ASTM A563M structural fasteners, and ASTM F2437/F2437M mechanical fastening systems. Grade 1 nuts are widely used in petrochemical plants, fabrication projects, and general engineering applications where economical fastening solutions are required.
ASTM A194/A194M Grade 1 Chemical Requirements
| Grade | Description and UNS Designation |
C | Mn | P | SE | Si |
|---|---|---|---|---|---|---|
| ASTM A194/A194M Grade 1 | C | 0.15 min | 1.00 | 0.040 | 0.050 | 0.40 |
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ASTM A194/A194M Grade 1 Hardness Requirements
| Grade and Type | Completed Nuts | Sample Nut after Treatment | ||
|---|---|---|---|---|
| Brinell Hardness | Rockwell Hardness | Brinell Hardness, min | Rockwell Hardness B Scale, min | |
| B Scale | ||||
| ASTM A194/A194M Grade 1 | 121 min | 70 min | 121 | 70 |
ASTM A194/A194M Grade 1 Proof Load Requirements (Inch Series)
| Nominal Size, in. | Threads per Inch | Stress Area in. 2 | Proof Load, lbf A | |
|---|---|---|---|---|
| Grade 1 | ||||
| Heavy HexB | HexC | |||
| 1/4 | 20 | 0.0316 | 4 130 | 3 820 |
| 5/16 | 18 | 0.0524 | 6 810 | 6 290 |
| 3/8 | 16 | 0.0774 | 10 080 | 9 300 |
| 7/16 | 14 | 0.1063 | 13 820 | 12 760 |
| 1/2 | 13 | 0.1419 | 18 450 | 17 030 |
| 9/16 | 12 | 0.182 | 23 660 | 21 840 |
| 5/8 | 11 | 0.226 | 29 380 | 27 120 |
| 3/4 | 10 | 0.334 | 43 420 | 40 080 |
| 7/8 | 9 | 0.462 | 60 060 | 55 440 |
| 1 | 8 | 0.606 | 78 780 | 72 720 |
| 11/8 | 8 | 0.790 | 102 700 | 94 800 |
| 11/4 | 8 | 1.000 | 130 000 | 120 000 |
| 13/8 | 8 | 1.233 | 160 200 | 148 000 |
| 11/2 | 8 | 1.492 | 194 000 | 170 040 |
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ASTM A194/A194M Grade 1 Proof Load Requirements (Metric Series)
| Nominal Size, mm | Threads Pitch | Stress Area mm 2 | Proof Load, kNA | |
|---|---|---|---|---|
| Grade 1 | ||||
| Heavy HexB | HexC | |||
| M6 | 1.0 | 20.1 | 18.0 | 16.6 |
| M8 | 1.25 | 36.6 | 32.8 | 30.2 |
| M10 | 1.50 | 58.0 | 51.9 | 47.9 |
| M12 | 1.75 | 84.3 | 75.5 | 69.5 |
| M14 | 2.0 | 115.0 | 102.9 | 94.9 |
| M16 | 2.0 | 157.0 | 140.5 | 129.5 |
| M20 | 2.5 | 245.0 | 219.3 | 202.1 |
| M22 | 2.5 | 303.0 | 271.2 | 249.9 |
| M24 | 3.0 | 353.0 | 315.9 | 291.2 |
| M27 | 3.0 | 459.0 | 411.0 | 378.7 |
| M30 | 3.5 | 561.0 | 502.1 | 462.8 |
| M36 | 4.0 | 817.0 | 731.2 | 674.0 |
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Related A194 Grades & References
Grade 1 is the low-carbon-steel A194 nut for general bolting. For Q&T variants see Grade 2 or the more common Grade 2H (refinery/petrochem standard). For corrosive service use stainless Grade 8 (304) or Grade 8M (316). Dimensions: ASME B18.2.2 heavy hex. Full specification: ASTM A194 PDF. A194 hub.
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