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Castle Nuts (DIN 935) - Marine Stainless Steel (A4)

Castle Nuts (DIN 935) – Marine Stainless Steel A4 (SUS316)

FULLERKREG DIN 935 Hexagon Slotted Castle Nuts in Marine Grade Stainless Steel A4 (SUS316 / 1.4401) offer superior corrosion resistance compared to standard A2 grade, making them the preferred choice for marine, offshore, chemical processing, and coastal construction environments. Manufactured to DIN 935 / ISO 7035 standards with a passivated (洗白钝化) finish, these castle nuts are designed for use with cotter pins or split pins to provide positive mechanical locking in high-vibration and safety-critical assemblies.

Product Specifications

  • Standard: DIN 935 / ISO 7035
  • Material: Marine Stainless Steel A4 / SUS316 / 1.4401
  • Surface Treatment: Passivated (洗白钝化) – natural silver finish
  • Thread: Metric coarse thread (ISO 68-1)
  • Size Range: M5 × 0.8 – M30 × 3.5
  • Strength Class: A4-70
  • RoHS Compliant: Yes
  • Key Advantage: Contains molybdenum (Mo 2–3%) for enhanced chloride and pitting corrosion resistance

Dimensional Data (DIN 935 – Marine Stainless Steel A4)

All dimensions in mm. Single-piece weight (单重) is approximate reference value.

Thread Size
(d)		 Pitch
(mm)		 Width Across Flats s
Min / Max (mm)		 Width Across Corners e
Min (mm)		 Wrenching Height m
Min / Max (mm)		 Nut Height h
Min / Max (mm)		 Slot Width n
(approx. mm)		 单重
(g/pc)
M5 0.8 7.78 / 8.00 8.79 3.70 / 4.00 5.70 / 6.00 1.6 ≈1.2
M6 1.0 9.78 / 10.00 11.05 4.70 / 5.00 7.14 / 7.50 2.0 ≈2.2
M8 1.25 12.73 / 13.00 14.38 6.14 / 6.50 9.14 / 9.50 2.5 ≈4.9
M10 1.5 16.73 / 17.00 17.77 7.64 / 8.00 11.57 / 12.00 3.0 ≈8.6
M12 1.75 18.67 / 19.00 20.03 9.64 / 10.00 14.57 / 15.00 3.5 ≈13.7
M14 2.0 21.67 / 22.00 23.35 10.30 / 11.00 15.57 / 16.00 4.0 ≈18.3
M16 2.0 23.67 / 24.00 26.75 12.30 / 13.00 18.48 / 19.00 4.0 ≈26.4
M18 2.5 26.16 / 27.00 29.56 14.30 / 15.00 20.16 / 21.00 5.0 ≈36.5
M20 2.5 29.16 / 30.00 32.95 14.90 / 16.00 21.16 / 22.00 5.0 ≈46.7
M22 2.5 31.00 / 32.00 35.03 16.90 / 18.00 25.16 / 26.00 5.0 ≈63.0
M24 3.0 35.00 / 36.00 39.55 17.70 / 19.00 26.16 / 27.00 6.0 ≈81.5
M27 3.0 40.00 / 41.00 45.20 20.70 / 22.00 29.16 / 30.00 6.0 ≈117.0
M30 3.5 45.00 / 46.00 50.85 22.70 / 24.00 32.00 / 33.00 6.0 ≈157.5

* 单重为参考值，实际重量因批次略有差异。尺寸数据依据 DIN 935 标准及实测数据，如有疑问请联系我们确认。

A4 vs A2 – Material Comparison

Property A2 (SUS304 / 1.4301) A4 (SUS316 / 1.4401)
Chromium Content 17–19% 16–18%
Nickel Content 8–10% 10–14%
Molybdenum None 2–3% (key differentiator)
Chloride Resistance Moderate Excellent
Pitting Resistance Moderate Superior
Marine / Coastal Use Limited Recommended
Chemical Processing Suitable for mild environments Preferred
Strength Class A2-70 A4-70

Selection Guide – DIN 935 Castle Nut (A4 Marine Stainless Steel)

Feature Details
Standard DIN 935 / ISO 7035
Material Grade A4 / SUS316 / 1.4401
Surface Passivated (洗白钝化) – natural silver finish
Corrosion Resistance Excellent – ideal for marine, offshore, and chemical environments
Locking Method Used with cotter pin / split pin through castle slots
Thread Type Metric coarse (ISO 68-1)
Applicable Bolt DIN 931 / DIN 933 hex bolts with drilled shank
Magnetic Slightly magnetic possible due to cold working
Temperature Range -196°C to +300°C (continuous service)
Typical Applications Marine hardware, offshore platforms, chemical plants, food processing, coastal structures
Packaging Bulk bag / small box / custom packaging available
MOQ Contact us for wholesale pricing and MOQ

Standard Reference

DIN 935 specifies hexagon slotted and castle nuts for use with metric bolts and screws, harmonized with ISO 7035. FULLERKREG manufactures these A4 marine grade nuts to full DIN 935 dimensional compliance. Material certification is available upon request (EN 10204 3.1 Mill Certificate).

  • DIN 935 – Hexagon slotted and castle nuts (metric)
  • ISO 7035 – Prevailing torque type hexagon nuts (slotted)
  • ISO 3506-2 – Mechanical properties of corrosion-resistant stainless steel fasteners (nuts), Annex F
  • ISO 68-1 – Metric screw threads – general plan
  • EN 10204 3.1 – Material test certificate available on request

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Why Choose FULLERKREG?

  • 🏭 Direct Manufacturer – Factory-direct pricing with no middlemen
  • 📐 DIN/ISO Precision – Strict dimensional compliance to international standards
  • 🔬 Material Certified – EN 10204 3.1 mill certificates available on request
  • 🌊 Marine Grade A4 – Superior Mo-alloyed SUS316 for harsh corrosive environments
  • 🌍 Global Shipping – Reliable export logistics to worldwide destinations
  • 📦 Flexible MOQ – Wholesale bulk orders and sample orders welcome
  • ⚙️ Full Range – M5 to M30 in stock, custom sizes available
  • ✅ RoHS Compliant – Meets environmental and regulatory requirements
  • 💬 Technical Support – Engineering assistance for material and size selection

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