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Dome Nuts (DIN 1587) - Marine Stainless Steel (A4)

Dome Nuts (DIN 1587) — Marine Stainless Steel A4 (SS316)

FULLERKREG DIN 1587 hexagon domed cap nuts (acorn nuts) in Marine Stainless Steel A4 (SUS 316) offer superior corrosion resistance compared to standard A2 grade, making them the preferred choice for marine, coastal, chemical, and highly corrosive environments. The domed cap fully encloses the thread end, providing both protection and a clean finished appearance. All parts are passivated (acid-washed & passivated finish) for enhanced surface quality and maximum long-term durability.

  • Standard: DIN 1587
  • Material: Marine Stainless Steel A4 / 1.4401 (SUS 316)
  • Surface Treatment: Acid-washed & Passivated (洗白钝化)
  • Size Range: M3 × 0.5 — M30 × 3.5
  • Thread: Metric coarse thread (ISO 68-1)
  • Drive: Hexagon (spanner-driven)
  • RoHS Compliant: Yes

A4 vs A2 — Why Choose Marine Grade?

Property A2 (SS304 / 1.4301) A4 (SS316 / 1.4401)
Molybdenum Content None 2–3% Mo added
Chloride Resistance Moderate Excellent
Marine / Coastal Use Limited Recommended
Chemical Resistance Good Superior
Pitting Corrosion Susceptible in salt environments Highly resistant
Food & Pharma Grade Acceptable Preferred

Dimensional Data — DIN 1587 Dome Nuts (Marine Stainless Steel A4)

All dimensions in mm. Single-piece weight (单重) is theoretical reference value based on SS316 density (7.98 g/cm³).

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 ≈ 2.6
M6 1.0 10.00 / 9.64 10.89 9.50 5.00 / 4.70 12.00 / 11.30 ≈ 4.6
M8 1.25 13.00 / 12.57 14.20 12.50 6.50 / 6.14 16.00 / 14.30 ≈ 9.6
M10 1.5 17.00 / 16.57 17.59 16.00 8.00 / 7.64 18.00 / 17.30 ≈ 17
M12 1.75 19.00 / 18.48 19.85 18.00 10.00 / 9.64 22.00 / 21.16 ≈ 27
M14 2.0 22.00 / 21.16 22.78 21.00 11.00 / 10.30 25.00 / 24.16 ≈ 42
M16 2.0 24.00 / 23.16 26.17 23.00 13.00 / 12.30 28.00 / 27.16 ≈ 58
M18 2.5 27.00 / 26.16 29.56 26.00 15.00 / 14.30 32.00 / 31.00 ≈ 83
M20 2.5 30.00 / 29.16 32.95 28.00 16.00 / 14.90 34.00 / 33.00 ≈ 111
M22 2.5 34.00 / 33.00 37.29 33.00 18.00 / 16.90 39.00 / 38.00 ≈ 161
M24 3.0 36.00 / 35.00 39.55 34.00 19.00 / 17.70 42.00 / 41.00 ≈ 196
M27 3.0 41.00 / 40.00 47.30 40.00 20.00 / 18.70 47.00 / 46.00 ≈ 287
M30 3.5 46.00 / 45.00 52.00 42.00 24.00 / 22.60 52.00 / 51.00 ≈ 393

* Unit weights are theoretical reference values based on SS316 density (7.98 g/cm³). Actual weights may vary slightly. Contact FULLERKREG for certified weight data on bulk orders.

Selection Guide — DIN 1587 Dome Nuts (A4 Marine Grade)

Application Requirement Recommended Specification
Marine / offshore / boat fittings M6–M24, A4 SS316, passivated — chloride-resistant
Coastal / salt-air environments M4–M20, A4 SS316 — superior pitting resistance
Chemical processing equipment M6–M24, A4 SS316 — resistant to acids and chlorides
Food processing / pharmaceutical M4–M16, A4 SS316 passivated — hygienic, easy to clean
Swimming pools / water treatment M6–M20, A4 SS316 — chlorinated water resistance
Decorative / visible outdoor fastening M3–M12, A4 SS316 passivated — premium finish, long-lasting

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
  • Material Standard: ISO 3506-2 Annex F (Austenitic A4 / 1.4401)

Product Gallery

DIN 1587 Dome Nuts — Marine Stainless Steel A4 (SS316) | 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
  • 🌊 Marine Grade A4 — SS316 with 2–3% Mo for outstanding chloride and pitting resistance
  • 🛡️ Passivated Finish — Acid-washed & passivated surface for maximum corrosion protection
  • 📦 Wholesale Ready — Bulk packaging, custom labeling, and OEM support available
  • 🌍 Global Export — Experienced in international shipping, documentation, and compliance
  • ✅ RoHS Compliant — All products meet RoHS environmental requirements
  • 📋 Material Certification — Mill test reports and material certificates available on request

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