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DIN 935 Class 8 Zinc Finish Steel Slotted Hex Nut

DIN 935 Class 8 Zinc Finish Steel Slotted Hex Castle Nut

FULLERKREG DIN 935 Class 8 Hexagon Slotted Castle Nuts are manufactured from 35K medium-strength carbon steel with a Zinc Cr3 (trivalent chromium zinc plating) surface finish. Conforming to DIN 935 / ISO 7035 standards, these castle nuts are engineered for use with cotter pins or split pins to deliver positive mechanical locking in high-load, high-vibration assemblies. Widely used in automotive, heavy machinery, agricultural equipment, construction, and general industrial applications where strength and corrosion protection are both required.

Product Specifications

  • Standard: DIN 935 / ISO 7035
  • Material: 35K Medium-Strength Carbon Steel
  • Surface Treatment: Zinc Cr3 (Trivalent Chromium Zinc Plating)
  • Thread: Metric coarse thread (ISO 68-1)
  • Size Range: M5 × 0.8 – M52 × 5.0
  • Property Class: Class 8
  • Proof Load Stress: 800 MPa (min.)
  • RoHS Compliant: Yes (Cr3 trivalent zinc, no hexavalent chromium)

Dimensional Data (DIN 935 – Class 8, Zinc Cr3)

All dimensions in mm. Single-piece weight (单重) is approximate reference value based on carbon steel density (7.85 g/cm³).

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 ≈4.7
M10 1.5 16.73 / 17.00 17.77 7.64 / 8.00 11.57 / 12.00 3.0 ≈8.4
M12 1.75 18.67 / 19.00 20.03 9.64 / 10.00 14.57 / 15.00 3.5 ≈13.3
M14 2.0 21.67 / 22.00 23.35 10.30 / 11.00 15.57 / 16.00 4.0 ≈17.8
M16 2.0 23.67 / 24.00 26.75 12.30 / 13.00 18.48 / 19.00 4.0 ≈25.6
M18 2.5 26.16 / 27.00 29.56 14.30 / 15.00 20.16 / 21.00 5.0 ≈35.5
M20 2.5 29.16 / 30.00 32.95 14.90 / 16.00 21.16 / 22.00 5.0 ≈45.2
M22 2.5 31.00 / 32.00 35.03 16.90 / 18.00 25.16 / 26.00 5.0 ≈61.0
M24 3.0 35.00 / 36.00 39.55 17.70 / 19.00 26.16 / 27.00 6.0 ≈78.5
M27 3.0 40.00 / 41.00 45.20 20.70 / 22.00 29.16 / 30.00 6.0 ≈113.0
M30 3.5 45.00 / 46.00 50.85 22.70 / 24.00 32.00 / 33.00 6.0 ≈152.0
M33 3.5 50.00 / 51.00 55.37 24.70 / 26.00 35.00 / 36.00 7.0 ≈205.0
M36 4.0 55.00 / 56.00 60.79 27.40 / 29.00 38.00 / 39.00 7.0 ≈268.0
M39 4.0 60.00 / 61.00 66.44 29.40 / 31.00 42.00 / 43.00 8.0 ≈348.0
M42 4.5 65.00 / 66.00 71.30 31.80 / 34.00 45.00 / 46.00 8.0 ≈435.0
M45 4.5 70.00 / 71.00 76.95 34.40 / 36.00 48.00 / 50.00 9.0 ≈545.0
M48 5.0 75.00 / 76.00 82.60 36.40 / 38.00 52.00 / 54.00 9.0 ≈670.0
M52 5.0 80.00 / 82.00 88.25 39.40 / 42.00 56.00 / 58.00 10.0 ≈820.0

* 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，如有疑问请联系我们确认。M33及以上尺寸为非优先尺寸，供货周期较长，请提前询价。

Surface Treatment – Zinc Cr3 Explained

Property Details
Plating Type Electrolytic Zinc with Trivalent Chromium (Cr3) Passivation
Coating Thickness 5–8 μm (standard); 8–12 μm (thick film available)
Salt Spray Resistance ≥ 72 hours (white rust); ≥ 200 hours (red rust) per ISO 9227
RoHS Status ✅ Compliant – No hexavalent chromium (Cr6)
Appearance Bright silver / slight blue iridescence
Temperature Resistance Up to 120°C continuous service
vs. Yellow Zinc (Cr6) Environmentally friendly alternative; similar corrosion performance

Selection Guide – DIN 935 Class 8 Castle Nut

Feature Details
Standard DIN 935 / ISO 7035
Material 35K Medium-Strength Carbon Steel
Property Class Class 8 (Proof Load Stress ≥ 800 MPa)
Surface Zinc Cr3 – bright silver, RoHS compliant
Locking Method Cotter pin / split pin through castle slots
Thread Type Metric coarse (ISO 68-1)
Applicable Bolt DIN 931 / DIN 933 Class 8.8 hex bolts with drilled shank
Typical Applications Automotive axles, agricultural machinery, heavy equipment, construction fastening
Temperature Range -40°C to +120°C (zinc coating limit)
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 metric bolts and screws, harmonized with ISO 7035. FULLERKREG manufactures Class 8 carbon steel castle nuts to full DIN 935 dimensional compliance. Hardness and mechanical property test reports are available upon request.

  • DIN 935 – Hexagon slotted and castle nuts (metric)
  • ISO 7035 – Prevailing torque type hexagon nuts (slotted)
  • ISO 898-2 – Mechanical properties of fasteners – nuts with specified proof load values (coarse thread)
  • ISO 68-1 – Metric screw threads – general plan
  • ISO 9227 – Corrosion tests in artificial atmospheres – salt spray tests
  • RoHS Directive 2011/65/EU – Restriction of hazardous substances (Cr3 compliant)

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Why Choose FULLERKREG?

  • 🏭 Direct Manufacturer – Factory-direct pricing with no middlemen
  • 📐 DIN/ISO Precision – Strict dimensional compliance to international standards
  • 🔬 Quality Certified – Hardness, tensile, and salt spray test reports available
  • 🛡️ RoHS Zinc Cr3 – Environmentally compliant trivalent zinc coating, no Cr6
  • ⚙️ Class 8 Strength – High proof load for demanding mechanical assemblies
  • 🌍 Global Shipping – Reliable export logistics to worldwide destinations
  • 📦 Flexible MOQ – Wholesale bulk orders and sample orders welcome
  • 📏 Wide Size Range – M5 to M52 available, covering standard and large sizes
  • 💬 Technical Support – Engineering assistance for grade and size selection

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