Home » DIN 917 Class 4 Steel Zinc Plated Cap Nut — Low Profile Thin Pattern

DIN 917 Class 4 Steel Zinc Plated Cap Nut — Low Profile Thin Pattern

DIN 917 Cap Nut — Low Profile Thin Pattern | Class 4 Steel Zinc Plated (Cr3)

FULLERKREG DIN 917 cap nuts are manufactured to the DIN 917 low-profile thin-pattern standard in low carbon steel with a zinc plated (Cr3 / trivalent chromium) surface finish. Rated at Class 4 strength, these cap nuts provide reliable mechanical performance and good corrosion resistance for general industrial, automotive, and construction fastening applications. The closed domed top protects bolt ends from contamination, damage, and corrosion while delivering a clean, finished appearance.

Product Specifications

Attribute Detail
Standard DIN 917
Type Low Profile Thin Pattern Cap Nut (Acorn Nut / Dome Nut)
Material Low Carbon Steel (Q195 / equivalent)
Surface Treatment Zinc Plated — Trivalent Chromium Cr3 (RoHS Compliant, Blue-White Finish)
Strength Class Class 4
Thread Type Metric Coarse Thread (ISO 68-1)
Size Range M3 – M20
Drive Type Hexagonal (Wrench / Spanner)
RoHS Compliance Yes — Cr3 (Trivalent Chromium), Hexavalent Chromium (Cr6) Free

Dimensional Data (DIN 917 — Low Profile Thin Pattern)

All dimensions in millimeters (mm). Tolerances per DIN 917 / ISO 4759-1.

Thread
d		 Pitch
p (mm)		 Width Across
Flats s (mm)		 Width Across
Corners e (mm)		 Total Height
m (mm)		 Cap Height
h (mm)		 Cap Inner
Dia. dk (mm)		 Cap Inner
Depth t (mm)		 Unit Weight
(g/pc)
M3 0.5 5.5 6.01 5.5 2.4 3.4 1.8 0.5
M4 0.7 7.0 7.66 6.5 2.8 4.5 2.2 1.1
M5 0.8 8.0 8.79 8.0 3.5 5.5 2.8 1.9
M6 1.0 10.0 11.05 9.0 4.0 6.5 3.2 3.3
M8 1.25 13.0 14.38 11.0 5.0 8.6 4.0 7.1
M10 1.5 17.0 18.90 14.0 6.0 10.6 4.8 14.2
M12 1.75 19.0 21.10 16.0 7.0 12.6 5.6 20.8
M14 2.0 22.0 24.49 19.0 8.0 14.6 6.4 35.0
M16 2.0 24.0 26.75 21.0 9.0 16.6 7.2 47.5
M20 2.5 30.0 33.53 25.0 11.0 20.6 9.0 90.0

* Unit weights are approximate reference values for low carbon steel (density ≈ 7.85 g/cm³). Actual weights may vary slightly by batch. Zinc coating adds negligible weight.

Zinc Plating (Cr3) — Coating Specification

Parameter Specification
Plating Type Electrolytic Zinc Plating
Passivation Trivalent Chromium (Cr3) — Blue-White Finish
Chromium Type Cr3 (Hexavalent Chromium Cr6 Free)
RoHS Compliant Yes
Typical Coating Thickness 5–12 μm (per ISO 4042)
Salt Spray Resistance ≥ 72 hours (white rust) per ISO 9227
Appearance Bright blue-white metallic finish

Selection Guide

Application Requirement Recommended Specification
General indoor mechanical assembly M3–M10, Class 4, Zinc Cr3
Automotive body & trim panels M5–M12, Class 4, Zinc Cr3 (RoHS)
Electrical enclosures & control panels M3–M8, Class 4, Zinc Cr3
Light structural / construction framing M8–M20, Class 4, Zinc Cr3
Furniture & shelving hardware M4–M10, Class 4, Zinc Cr3
Agricultural & garden equipment M6–M16, Class 4, Zinc Cr3
Bolt-end protection (aesthetic finish) M3–M20, Class 4, Zinc Cr3 — bright appearance

Standard Reference

DIN 917 specifies low-profile thin-pattern cap nuts with a closed domed top that covers and protects the bolt end. Key standard relationships:

  • DIN 917 — Low profile thin pattern cap nut (this product)
  • DIN 1587 — High profile cap nut (taller dome, deeper cap cavity)
  • Thread tolerance: 6H per ISO 965-1
  • Mechanical properties: Class 4 per ISO 898-2
  • Dimensional tolerance: ISO 4759-1 Product Grade A (M3–M16), Grade B (M20)
  • Zinc plating standard: ISO 4042 / DIN 50979
  • Salt spray test: ISO 9227

Product Gallery

DIN 917 Class 4 Steel Zinc Plated Cap Nut — actual product photos:

[Product Image 1] [Product Image 2] [Product Image 3] [Product Image 4]

Why FULLERKREG

  • 🏭 Direct Manufacturer — Produced in our own facility with full process control from raw material to finished part
  • 📐 Strict DIN Compliance — Every batch dimensionally verified against DIN 917 drawings; mechanical properties certified to Class 4 (ISO 898-2)
  • 🔬 Cr3 Zinc Plating Quality Control — Coating thickness and salt spray resistance tested per ISO 4042 & ISO 9227; Cr6-free certification available
  • 📦 Wholesale & Bulk Ready — Standard packaging in bulk bags or box-of-boxes; custom labeling and kitting available for OEM/distributor orders
  • 🌍 Global Export Experience — Regularly shipped to Europe, North America, Southeast Asia, and the Middle East with full export documentation
  • ⚡ Fast Lead Times — In-stock sizes available for immediate dispatch; large-volume and custom orders on short lead time
  • 💬 Engineering Support — Technical team available to assist with specification, substitution, and application questions

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