Related 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
ISO 4032 Hexagon Nuts Dimension Standard
The Global Standard for Regular Metric Hex Nuts in Mechanical, Structural, and Process Industry Applications.
ISO 4032 Hexagon Nuts are the most widely used metric regular hexagon nuts in the world, defined as Style 1 metric hex nuts in property classes 6, 8, 10, and 12, covering all critical dimensional requirements including width across flats, width across corners, nut height, thread pitch, and chamfer specifications for metric sizes M1 through M64 — making them the standard mating nut for metric hex bolts, hex cap screws, and stud bolts in virtually every engineering sector globally. The ISO 4032 standard ensures full dimensional interchangeability across all compliant nut manufacturers worldwide, which is essential for global procurement projects, maintenance operations, and assembly lines sourcing fasteners from multiple vendors simultaneously. These hexagon nuts are manufactured to ASTM A1082, the specification for high-strength stainless steel bolting material, providing superior corrosion resistance, excellent mechanical performance, and non-magnetic properties — making ASTM A1082 ISO 4032 hex nuts the preferred choice for chemical processing equipment, marine structures, food and beverage processing machinery, water treatment plants, and pharmaceutical facilities where hygiene, corrosion resistance, and long service life are mandatory requirements. The combination of ISO 4032 dimensional precision and ASTM A1082 material performance ensures consistent preload development, reliable joint clamping, and extended service life without maintenance intervention. Full material traceability per EN 10204 Type 3.1 is available for all ASTM A1082 ISO 4032 hex nut lots.
ISO 4032 Hexagon Nuts Dimensions
| Nominal Size | c | da | e | m | s | Weight Per Pc | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Max | Min | Max | Min | Min | Max | Min | Max | Min | ||
| M1.6 | 0.2 | 0.1 | 2.42 | 2 | 3.41 | 1.3 | 1.05 | 3.2 | 3.02 | - |
| M2 | 0.2 | 0.1 | 3.07 | 2.5 | 4.32 | 1.6 | 1.35 | 4 | 3.82 | - |
| M2.5 | 0.3 | 0.1 | 4.07 | 3.5 | 5.45 | 2 | 1.75 | 5 | 4.82 | - |
| M3 | 0.4 | 0.15 | 4.57 | 4 | 6.01 | 2.4 | 2.15 | 5.5 | 5.32 | - |
| M4 | 0.4 | 0.15 | 5.88 | 5 | 7.66 | 3.2 | 2.9 | 7 | 6.78 | - |
| M5 | 0.5 | 0.15 | 6.88 | 6 | 8.79 | 4.7 | 4.5 | 8 | 7.78 | - |
| M6 | 0.50 | 0.15 | 6.75 | 6.00 | 11.05 | 5.20 | 4.90 | 10.00 | 9.78 | - |
| M8 | 0.60 | 0.15 | 8.75 | 8.00 | 14.38 | 6.80 | 6.44 | 13.00 | 12.73 | 0.0046 |
| M10 | 0.60 | 0.15 | 10.80 | 10.00 | 17.77 | 8.40 | 8.04 | 16.00 | 15.73 | 0.0100 |
| M12 | 0.60 | 0.15 | 13.00 | 12.00 | 20.03 | 10.80 | 10.37 | 18.00 | 17.73 | 0.0151 |
| M14 | 0.60 | 0.15 | 15.10 | 14.00 | 23.36 | 12.80 | 12.10 | 21.00 | 20.67 | 0.0235 |
| M16 | 0.80 | 0.20 | 17.30 | 16.00 | 26.75 | 14.80 | 14.10 | 24.00 | 23.67 | 0.0304 |
| M18 | 0.80 | 0.20 | 19.50 | 18.00 | 29.56 | 15.80 | 15.10 | 27.00 | 26.16 | 0.0435 |
| M20 | 0.80 | 0.20 | 21.60 | 20.00 | 32.95 | 18.00 | 16.90 | 30.00 | 29.16 | 0.0587 |
| M22 | 0.80 | 0.20 | 23.70 | 22.00 | 37.29 | 19.40 | 18.10 | 34.00 | 33.00 | 0.0720 |
| M24 | 0.80 | 0.20 | 25.90 | 24.00 | 39.55 | 21.50 | 20.20 | 36.00 | 35.00 | 0.0983 |
| M27 | 0.80 | 0.20 | 29.10 | 27.00 | 45.20 | 23.80 | 22.50 | 41.00 | 40.00 | 0.1442 |
| M30 | 0.80 | 0.20 | 32.40 | 30.00 | 50.85 | 25.60 | 24.30 | 46.00 | 45.00 | 0.2022 |
| M33 | 0.80 | 0.20 | 35.60 | 33.00 | 55.37 | 28.70 | 27.40 | 50.00 | 49.00 | 0.2584 |
| M36 | 0.80 | 0.20 | 38.90 | 36.00 | 60.79 | 31.00 | 29.40 | 55.00 | 53.80 | 0.3586 |
| M39 | 1.00 | 0.30 | 42.10 | 39.00 | 66.44 | 33.40 | 31.80 | 60.00 | 58.80 | 0.4678 |
| M42 | 1.00 | 0.30 | 45.40 | 42.00 | 71.30 | 34.00 | 32.40 | 65.00 | 63.10 | 0.5908 |
| M45 | 1.00 | 0.30 | 48.60 | 45.00 | 76.95 | 36.00 | 34.40 | 70.00 | 68.10 | 0.7528 |
| M48 | 1.00 | 0.30 | 51.80 | 48.00 | 82.60 | 38.00 | 36.40 | 75.00 | 73.10 | 0.8989 |
| M52 | 1.00 | 0.30 | 56.20 | 52.00 | 88.25 | 42.00 | 40.40 | 80.00 | 78.10 | 1.1251 |
| M56 | 1.00 | 0.30 | 60.50 | 56.00 | 93.56 | 45.00 | 43.40 | 85.00 | 82.80 | 1.3227 |
| M60 | 1.00 | 0.30 | 64.80 | 60.00 | 99.21 | 48.00 | 46.40 | 90.00 | 87.80 | 1.5750 |
| M64 | 1.00 | 0.30 | 69.10 | 64.00 | 104.86 | 51.00 | 49.10 | 95.00 | 92.80 | 1.8190 |
Frequently Asked Questions
What stainless steel grades does ASTM A1082 cover for hexagon nuts?
ASTM A1082 covers duplex grades (S31803/2205, S32205/2205, S32750/2507, S32760/Zeron 100, S39277/AL-6XN) and precipitation-hardening grades (S17400/17-4 PH, S17700/17-7 PH, S15700/15-7 PH, S35500/AM-355) - all available for this product family at TorqBolt.
What is the standard dimensional reference for these hexagon nuts?
This product follows ISO 4032, the dimensional standard for hexagon nuts in stainless steel. Material chemistry, mechanical properties and heat treatment follow ASTM A1082/A1082M. TorqBolt supplies both inch-series and metric sizes per the applicable ASME or ISO drawing.
Are A1082 hexagon nuts suitable for sour service (NACE MR0175)?
Yes, with hardness control. NACE MR0175 / ISO 15156 permits duplex grades S31803, S32205, S32750, S32760 at 28 HRC max for sour service. 17-4 PH (S17400) at H1150 condition (28 HRC) is the most common PH grade qualified for sour service. TorqBolt provides NACE-MR0175 compliant heat-treat reports.
What is the typical strength of A1082 super-duplex 2507 (S32750) hexagon nuts?
Super-duplex 2507 (S32750) per A1082: tensile 116 ksi (800 MPa) min, yield 80 ksi (550 MPa) min, elongation 15% min, 32 HRC max. PREN ≈ 42 - suitable for seawater, brine and chloride-rich pressure-vessel service. Higher strength than austenitic A193 B8M while offering pitting resistance well above 304/316.
References & Standards
- ASTM A1082 / A1082M - Standard Specification for High-Strength Precipitation-Hardening and Duplex Stainless Steel Bolting for Special-Purpose Applications (current edition 2016, active)
- ASTM A962 / A962M - General Requirements for Special-Purpose Bolting Materials
- ASTM A370 - Mechanical Testing of Steel Products
- NACE MR0175 / ISO 15156 - Sour-service hardness limits for petroleum & natural gas industries
- ASME B18 series - Dimensional standards for bolts, screws, nuts, studs
- ISO 4032 / 4033 / 4035 - Metric hexagon nut dimensional standards
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