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 4035 Hexagon Lock Nuts Dimension Standard
Reduced-Height Metric Hex Nuts Used as Jam Nuts for Vibration-Resistant Double-Nut Locking in Industrial Assemblies.
ISO 4035 Hexagon Lock Nuts are metric-series internally threaded fasteners with a reduced height — approximately 60% of a standard ISO 4032 regular nut — that serve as prevailing torque jam nuts used against a primary nut or directly against the joint face in applications where vibration resistance, precise axial load control, or space constraints prevent the use of a full-height nut. ISO 4035 defines property class 04 for thin nuts and covers all critical dimensional requirements including width across flats, width across corners, nut height, chamfer angle, and thread pitch for metric sizes M1 through M64, providing a globally recognized dimensional reference for thin hex nut procurement. These thin lock nuts are manufactured to ASTM A1082, the specification for high-strength stainless steel bolting material, which provides excellent corrosion resistance, reliable mechanical performance, and non-magnetic properties in marine and offshore structures, chemical process equipment, food-grade machinery, and water treatment infrastructure — where both the locking function and corrosion resistance of the nut are simultaneously critical to joint integrity. ISO 4035 thin nuts are commonly used as jam nuts tightened against ISO 4032 or ISO 4033 primary nuts to create a mechanically locked double-nut configuration that resists self-loosening under vibration without the need for thread-locking adhesives or mechanical locking inserts. Full EN 10204 Type 3.1 documentation is available for all ASTM A1082 ISO 4035 thin nut lots.
Hexagon Thin Nuts Chamfered
ISO 4035 Dimensions
| Thread size d | P | da | dw | e | m | m´ | s | |||
|---|---|---|---|---|---|---|---|---|---|---|
| min. | max. | min. | min. | max. | min. | min. | max. | min. | ||
| M1.6 | 0.35 | 1.6 | 1.84 | 2.4 | 3.48 | 1 | 0.75 | 0.6 | 3.2 | 3.08 |
| M1.8 | 0.35 | 1.8 | 2.06 | 2.7 | 3.82 | 1.1 | 0.85 | 0.68 | 3.5 | 3.38 |
| M2 | 0.4 | 2 | 2.3 | 3.1 | 4.32 | 1.2 | 0.95 | 0.76 | 4 | 3.82 |
| M2.5 | 0.45 | 2.5 | 2.9 | 4.1 | 5.45 | 1.6 | 1.35 | 1.06 | 5 | 4.82 |
| M3 | 0.45 | 3 | 3.45 | 4.6 | 6.01 | 1.8 | 1.55 | 1.24 | 5.5 | 5.32 |
| M3.5 | 0.6 | 3.5 | 4 | 5.1 | 6.58 | 2 | 1.75 | 1.4 | 6 | 5.82 |
| M4 | 0.7 | 4 | 4.6 | 5.9 | 7.66 | 2.2 | 1.95 | 1.56 | 7 | 6.78 |
| M5 | 0.8 | 5 | 5.75 | 6.9 | 9.79 | 2.7 | 2.45 | 1.96 | 8 | 7.78 |
| M6 | 1 | 6 | 6.75 | 8.9 | 11.05 | 3.2 | 2.9 | 2.32 | 10 | 9.78 |
| M8 | 1.25 | 8 | 8.75 | 11.6 | 14.38 | 4 | 3.7 | 2.96 | 13 | 12.73 |
| M10 | 1.5 | 10 | 10.8 | 15.6 | 18.9 | 5 | 4.7 | 3.76 | 17 | 16.73 |
| M12 | 1.75 | 12 | 13 | 17.4 | 21.1 | 6 | 5.7 | 4.56 | 19 | 18.67 |
| M14 | 2 | 14 | 15.1 | 20.5 | 24.49 | 7 | 6.42 | 5.14 | 22 | 21.67 |
| M16 | 2 | 16 | 17.3 | 22.5 | 26.75 | 8 | 7.42 | 5.94 | 24 | 23.67 |
| M18 | 2.5 | 18 | 19.5 | 24.9 | 29.56 | 9 | 8.42 | 6.74 | 27 | 26.16 |
| M20 | 2.5 | 20 | 21.6 | 27.7 | 32.95 | 10 | 9.1 | 7.28 | 30 | 29.16 |
| M22 | 2.5 | 22 | 23.8 | 29.5 | 35.03 | 11 | 9.9 | 7.92 | 32 | 31 |
| M24 | 3 | 24 | 25.9 | 33.2 | 39.55 | 12 | 10.9 | 8.72 | 36 | 35 |
| M27 | 3 | 27 | 29.2 | 38 | 45.2 | 13.5 | 12.4 | 9.9 | 41 | 40 |
| M30 | 3.5 | 30 | 32.4 | 42.7 | 50.85 | 15 | 13.9 | 11.1 | 46 | 45 |
| M33 | 3.5 | 33 | 35.6 | 46.6 | 55.37 | 16.5 | 15.4 | 12.3 | 50 | 49 |
| M36 | 4 | 36 | 38.9 | 51.1 | 60.79 | 18 | 16.9 | 13.5 | 55 | 53.8 |
| M39 | 4 | 39 | 42.1 | 55.9 | 66.44 | 19.5 | 18.2 | 14.6 | 60 | 58.8 |
| M42 | 4.5 | 42 | 45.4 | 60 | 71.3 | 21 | 19.7 | 15.8 | 65 | 63.1 |
| M45 | 4.5 | 45 | 48.6 | 64.7 | 76.95 | 22.5 | 21.2 | 17 | 70 | 68.1 |
| M48 | 5 | 48 | 51.8 | 69.4 | 82.6 | 24 | 22.7 | 18.2 | 75 | 73.1 |
| M52 | 5 | 52 | 56.2 | 74.2 | 88.25 | 26 | 24.7 | 19.8 | 80 | 78.1 |
Frequently Asked Questions
What stainless steel grades does ASTM A1082 cover for din 439?
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 din 439?
This product follows ISO 4035, the dimensional standard for din 439 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 din 439 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) din 439?
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
Satisfaction Survey
