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FULLERKREG DIN 439 thin hexagon nuts in A4 marine-grade stainless steel (SUS 316 / 1.4401) offer superior corrosion resistance compared to standard A2 (SS304), making them the preferred choice for marine, offshore, chemical processing, and highly corrosive environments. Manufactured to DIN 439 / ISO 4035 standards with a reduced height profile for jam-nut and locking applications. All nuts are passivated and whitened for a clean, bright finish and enhanced surface protection.
| Attribute | Details |
|---|---|
| Standard | DIN 439 / ISO 4035 |
| Type | Thin Hexagon Nut (Jam Nut / Half Nut) |
| Material | A4 Marine Stainless Steel (SUS 316 / 1.4401) |
| Surface Treatment | Passivated & Whitened (Bright Finish) |
| Strength Grade | A4-70 |
| Size Range | M1.6 – M48 |
| Thread | Metric Coarse Thread (per ISO 261) |
| Key Advantage | Molybdenum (Mo 2–3%) addition for superior chloride & saltwater resistance |
| RoHS Compliant | Yes |
Width Across Flats (s), Width Across Corners (e), Nut Height (m) — per DIN 439B standard. Unit weight (g) is theoretical reference value for A4 SS316 (density 7.98 g/cm³).
| Thread Size | Pitch (mm) | s max (mm) | s min (mm) | e min (mm) | m max (mm) | m min (mm) | Unit Weight (g/pc) |
|---|---|---|---|---|---|---|---|
| M1.6 | 0.35 | 3.20 | 3.00 | 3.41 | 1.00 | 0.75 | 0.06 |
| M2 | 0.4 | 4.00 | 3.80 | 4.32 | 1.20 | 0.95 | 0.12 |
| M2.3 | 0.4 | 4.50 | 4.30 | 4.88 | 1.20 | 0.95 | 0.15 |
| M2.5 | 0.45 | 5.00 | 4.80 | 5.45 | 1.60 | 1.35 | 0.22 |
| M2.6 | 0.45 | 5.00 | 4.80 | 5.45 | 1.60 | 1.35 | 0.22 |
| M3 | 0.5 | 5.50 | 5.30 | 6.01 | 1.80 | 1.55 | 0.35 |
| M3.5 | 0.6 | 6.00 | 5.80 | 6.01 | 2.00 | 1.75 | 0.45 |
| M4 | 0.7 | 7.00 | 6.78 | 7.66 | 2.20 | 1.95 | 0.73 |
| M5 | 0.8 | 8.00 | 7.78 | 8.79 | 2.70 | 2.45 | 1.19 |
| M6 | 1 | 10.00 | 9.78 | 11.05 | 2.70 | 2.45 | 1.79 |
| M6×1.25 | 1.25 | 10.00 | 9.78 | 11.05 | 3.20 | 2.90 | 2.11 |
| M8 | 1.25 | 13.00 | 12.73 | 14.38 | 4.00 | 3.70 | 3.87 |
| M10 | 1.5 | 17.00 | 16.73 | 18.90 | 5.00 | 4.70 | 7.24 |
| M10×1.25 | 1.25 | 17.00 | 16.73 | 18.90 | 5.00 | 4.70 | 7.24 |
| M12 | 1.75 | 19.00 | 18.67 | 21.10 | 6.00 | 5.70 | 11.87 |
| M12×1.75 | 1.75 | 19.00 | 18.67 | 21.10 | 6.00 | 5.70 | 11.87 |
| M14 | 2 | 22.00 | 21.67 | 24.49 | 7.00 | 6.42 | 18.60 |
| M16 | 2 | 24.00 | 23.67 | 26.75 | 8.00 | 7.42 | 26.97 |
| M16×2 | 2 | 24.00 | 23.67 | 26.75 | 8.00 | 7.42 | 26.97 |
| M18 | 2.5 | 27.00 | 26.16 | 29.56 | 9.00 | 8.42 | 37.72 |
| M20 | 2.5 | 30.00 | 29.16 | 32.95 | 10.00 | 9.10 | 52.30 |
| M22 | 2.5 | 32.00 | 31.00 | 35.03 | 11.00 | 9.90 | 68.40 |
| M24 | 3 | 36.00 | 35.00 | 39.55 | 12.00 | 10.90 | 98.60 |
| M27 | 3 | 41.00 | 40.00 | 45.20 | 13.50 | 12.40 | 145.90 |
| M30 | 3.5 | 46.00 | 45.00 | 50.85 | 15.00 | 13.90 | 206.20 |
| M33 | 3.5 | 50.00 | 49.00 | 55.37 | 16.50 | 15.40 | 279.70 |
| M36 | 4 | 55.00 | 53.80 | 60.79 | 18.00 | 16.90 | 382.20 |
| M39 | 4 | 60.00 | 58.80 | 66.44 | 19.50 | 18.20 | 492.90 |
| M42 | 4.5 | 65.00 | 63.10 | 71.30 | 21.00 | 19.70 | 628.60 |
| M45 | 4.5 | 70.00 | 68.10 | 76.95 | 22.50 | 21.20 | 794.50 |
| M48 | 5 | 75.00 | 73.10 | 82.60 | 24.00 | 22.70 | 985.80 |
* Unit weight values are theoretical reference based on A4 SS316 density (7.98 g/cm³). Actual weights may vary slightly. Sizes M1.6–M2.6 and M45 are non-preferred; availability is limited and MOQ may be higher.
| Property | Value |
|---|---|
| Proof Load Stress | 580 N/mm² |
| Hardness (Vickers) | HV 147 – 302 (Rockwell B70–B100) |
| Tensile Strength (min) | 700 N/mm² |
| Yield Strength (min) | 450 N/mm² |
| Element | C | Si | Mn | P | S | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| Max % | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 16.5–18.5 | 10.0–13.0 | 2.0–3.0 |
* Molybdenum (Mo) content is the key differentiator of A4 (SS316) vs A2 (SS304), providing significantly enhanced resistance to chloride pitting and crevice corrosion in marine and chemical environments.
| Property | A2 (SS304) | A4 (SS316) |
|---|---|---|
| Molybdenum Content | None | 2.0–3.0% |
| Chloride Resistance | Moderate | Excellent |
| Marine / Saltwater Use | Limited | Recommended |
| Chemical Processing | Moderate | Superior |
| Pitting Resistance (PRE) | ~18 | ~24–26 |
| Cost | Standard | Premium (~20–30% higher) |
| Application | Recommended Size | Notes |
|---|---|---|
| Marine / Offshore structures | M6 – M36 | Saltwater splash zones, boat fittings, dock hardware |
| Chemical processing equipment | M8 – M24 | Acid/alkali environments; Mo content resists pitting |
| Food & pharmaceutical industry | M3 – M16 | Hygienic, non-magnetic, easy to clean |
| Locking / Jam applications | M3 – M24 | Pair with standard hex nut; tighten jam nut first |
| Coastal / high-humidity outdoor | All sizes | Superior long-term performance vs A2 in salt-laden air |
| Heavy structural / large diameter | M27 – M48 | Contact FULLERKREG for bulk pricing and lead time |
These thin hexagon nuts conform to DIN 439 Part B (equivalent to ISO 4035). Material and mechanical properties comply with ISO 3506-2 for austenitic stainless steel fasteners, grade A4-70. Thread tolerance is per ISO 965-2 (6H).
DIN 439 Thin Hexagon Nuts — A4 Marine Stainless Steel (SS316) — FULLERKREG
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🏭 Direct Manufacturer — Factory-direct pricing with no middlemen, ensuring competitive wholesale rates.
🌊 True Marine Grade — Genuine A4 SS316 with Mo content verified; not substituted with A2 SS304.
📐 Precision to Standard — Every nut manufactured and inspected to DIN 439 / ISO 4035 dimensional tolerances.
🔬 Material Certified — Full material traceability; mill certificates and test reports available on request.
📦 Bulk & Wholesale Ready — Flexible MOQ, bulk packaging, and custom labeling available for distributors.
🚢 Global Shipping — Reliable international logistics with experience in B2B export to 50+ countries.
✅ RoHS & REACH Compliant — All products meet international environmental and safety regulations.
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