Home » Dome Nuts (DIN 1587) - Bright Zinc Plated Carbon Steel (Class 4)

Dome Nuts (DIN 1587) - Bright Zinc Plated Carbon Steel (Class 4)

Dome Nuts (DIN 1587) — Bright Zinc Plated Carbon Steel (Class 4)

FULLERKREG DIN 1587 hexagon domed cap nuts (acorn nuts) in Q195 low carbon steel with bright zinc plating (Cr3, trivalent chromium passivation) offer a cost-effective solution for general-purpose indoor and light outdoor fastening applications. The domed cap fully encloses the thread end, providing both mechanical protection and a neat finished appearance. The bright zinc Cr3 coating delivers reliable corrosion protection while meeting RoHS environmental requirements.

  • Standard: DIN 1587
  • Material: Q195 Low Carbon Steel
  • Property Class: Class 4
  • Surface Treatment: Bright Zinc Plated — Trivalent Chromium Cr3 Passivation (Zinc Cr3)
  • Coating Thickness: ≥5 μm (standard); ≥12 μm available on request
  • Size Range: M3 × 0.5 — M30 × 3.5
  • Thread: Metric coarse thread (ISO 68-1)
  • Drive: Hexagon (spanner-driven)
  • RoHS Compliant: Yes — Cr3 (trivalent) passivation, hexavalent chromium-free

Zinc Plating Specification — Cr3 vs Cr6

Property Cr6 (Hexavalent — Yellow Zinc) Cr3 (Trivalent — Bright Zinc) ✔
RoHS Compliance ❌ Non-compliant ✅ Fully compliant
Appearance Yellow / iridescent Bright silver / clear
Corrosion Resistance Good Good (equivalent performance)
Environmental Safety Hazardous (Cr6 restricted) Safe — no toxic chromate
EU REACH / ELV Restricted Compliant

Dimensional Data — DIN 1587 Dome Nuts (Bright Zinc Plated, Class 4)

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

Nominal Size
d		 Pitch
(mm)		 Width Across Flats
s max / s min (mm)		 Width Across Corners
e min (mm)		 Dome Dia
dk max (mm)		 Thickness
m max / m min (mm)		 Height
h max / h min (mm)		 单重 Unit Weight
(g/pc, ref.)
M3 0.5 5.50 / 5.14 6.01 5.50 3.20 / 2.70 6.50 / 5.86 ≈ 0.8
M4 0.7 7.00 / 6.64 7.50 6.50 3.20 / 2.90 8.00 / 7.42 ≈ 1.5
M5 0.8 8.00 / 7.64 8.63 7.50 4.00 / 3.70 10.00 / 9.42 ≈ 2.4
M6 1.0 10.00 / 9.64 10.89 9.50 5.00 / 4.70 12.00 / 11.30 ≈ 4.4
M8 1.25 13.00 / 12.57 14.20 12.50 6.50 / 6.14 16.00 / 14.30 ≈ 9.3
M10 1.5 17.00 / 16.57 17.59 16.00 8.00 / 7.64 18.00 / 17.30 ≈ 16
M12 1.75 19.00 / 18.48 19.85 18.00 10.00 / 9.64 22.00 / 21.16 ≈ 26
M14 2.0 22.00 / 21.16 22.78 21.00 11.00 / 10.30 25.00 / 24.16 ≈ 41
M16 2.0 24.00 / 23.16 26.17 23.00 13.00 / 12.30 28.00 / 27.16 ≈ 57
M18 2.5 27.00 / 26.16 29.56 26.00 15.00 / 14.30 32.00 / 31.00 ≈ 80
M20 2.5 30.00 / 29.16 32.95 28.00 16.00 / 14.90 34.00 / 33.00 ≈ 108
M22 2.5 34.00 / 33.00 37.29 33.00 18.00 / 16.90 39.00 / 38.00 ≈ 157
M24 3.0 36.00 / 35.00 39.55 34.00 19.00 / 17.70 42.00 / 41.00 ≈ 192
M27 3.0 41.00 / 40.00 47.30 40.00 20.00 / 18.70 47.00 / 46.00 ≈ 280
M30 3.5 46.00 / 45.00 52.00 42.00 24.00 / 22.60 52.00 / 51.00 ≈ 383

* Unit weights are theoretical reference values based on carbon steel density (7.85 g/cm³), excluding zinc coating weight. Actual weights may vary slightly. Contact FULLERKREG for certified weight data on bulk orders.

Selection Guide — DIN 1587 Dome Nuts (Bright Zinc Plated, Class 4)

Application Requirement Recommended Specification
General indoor / light outdoor fastening M3–M16, Class 4, Zinc Cr3 — cost-effective, clean finish
Thread end protection (safety cover) Any size — dome cap fully encloses exposed thread
Furniture / cabinetry / fixtures M4–M10, Class 4, Zinc Cr3 — bright appearance, economical
Electrical enclosures / control panels M4–M12, Class 4, Zinc Cr3 — RoHS compliant, clean look
Automotive / light machinery (dry environments) M6–M20, Class 4, Zinc Cr3 — standard corrosion protection
High corrosion / marine / chemical environments ⚠️ Not recommended — consider A2 or A4 stainless steel grades

Standard Reference

DIN 1587 specifies hexagon domed cap nuts (acorn nuts) with metric coarse thread. The standard defines the hexagon body dimensions (width across flats, height) and the domed cap geometry (dome diameter and total height). DIN 1587 is harmonized with ISO 1587. Thread tolerance class: 6H per ISO 965-1.

  • Equivalent Standards: ISO 1587, BS 1768
  • Thread Standard: ISO 68-1 Metric Coarse
  • Tolerance Class: 6H
  • Property Class: Class 4 per ISO 898-2
  • Coating Standard: ISO 4042 (Electroplated zinc coatings on threaded fasteners)
  • Passivation: Trivalent chromium Cr3 — RoHS / REACH / ELV compliant

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DIN 1587 Dome Nuts — Bright Zinc Plated Carbon Steel Class 4 | FULLERKREG

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Why FULLERKREG?

  • 🏭 Direct Manufacturer — Factory-direct pricing, no middlemen, consistent quality control
  • 📐 DIN / ISO Precision — Strict dimensional compliance to DIN 1587 & ISO 1587 standards
  • 🔩 Full Size Range — M3 to M30 in stock, ready for bulk wholesale orders
  • ✨ Bright Zinc Cr3 Finish — Clean silver appearance, RoHS-compliant trivalent passivation
  • ✅ RoHS / REACH Compliant — Hexavalent chromium-free, meets EU environmental directives
  • 📦 Wholesale Ready — Bulk packaging, custom labeling, and OEM support available
  • 🌍 Global Export — Experienced in international shipping, documentation, and compliance
  • 📋 Material Certification — Mill test reports and coating inspection reports available on request

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