Home » Hexagonal Stud Connector Nuts (DIN 6334)

Hexagonal Stud Connector Nuts (DIN 6334)

Hexagonal Stud Connector Nuts (DIN 6334)

FULLERKREG DIN 6334 hexagonal long coupling nuts (also known as stud connector nuts, extension nuts, or long hex nuts) are manufactured to the DIN 6334 standard with a nut length of 3×d — three times the nominal thread diameter — providing full thread engagement at both ends for reliable rod-to-rod and stud-to-stud connections. Available in stainless steel A2 (SUS304), marine stainless steel A4 (SUS316), and zinc-plated carbon steel, covering thread sizes M3 through M56 for structural, mechanical, architectural, and marine applications worldwide.

Browse by Material & Surface

Stainless Steel A2 (SUS304) — Passivated
材质：SUS304 (A2 / 1.4301) · 表面：洗白钒化 · 尺寸：M3–M56 · 长度：3×d · 耐腐蚀：良好 · 适用：通用工业 / 室内外环境

Marine Stainless Steel A4 (SUS316) — Passivated
材质：SUS316 (A4 / 1.4401) · 表面：洗白钒化 · 尺寸：M3–M56 · 长度：3×d · 耐腐蚀：优秀 (Mo合金) · 适用：海洋 / 化工 / 食品级

Q195 Low Carbon Steel — Zinc Plated
材质：Q195 低碳钙 · 表面：电镀锌 (Zn) · 尺寸：M3–M56 · 长度：3×d · 耐腐蚀：良好 (≥ 72h盐雾) · 适用：建筑 / HVAC / 通用工业

Selection Guide

Sub-Series Material Surface Size Range Corrosion Resistance Typical Application
DIN 6334 — A2 SUS304 (A2) Passivated M3–M56 Good General industrial, indoor/outdoor
DIN 6334 — A4 SUS316 (A4) Passivated M3–M56 Excellent Marine, chemical, food-grade, offshore
DIN 6334 — Zinc Plated Q195 Steel Zinc Plated M3–M56 Good (≥72h) Construction, HVAC, general industrial

Standard Notes

DIN 6334 specifies hexagonal long nuts with a nut length equal to 3 times the nominal thread diameter (m = 3×d). This extended engagement length — compared to approximately 0.8×d for a standard DIN 934 hex nut — ensures full thread engagement at both ends when joining two externally threaded components such as threaded rods, studs, or anchor bolts. The hexagonal profile is compatible with standard spanners and sockets.

  • Standard: DIN 6334 — Hexagon long nuts, metric coarse thread
  • Nut length: m = 3×d (e.g. M10 → 30 mm; M20 → 60 mm; M36 → 108 mm)
  • Thread: Metric coarse, right-hand, tolerance class 6H
  • Equivalent / related: ISO 4033 (high hex nut), EN 14399-3 (structural)
  • Typical uses: Threaded rod extension, stud-to-stud connection, anchor bolt adjustment, height adjustment assemblies, architectural hardware, marine structures

Product Gallery

DIN 6334 Hexagonal Long Coupling Nuts — actual product photos:

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Why FULLERKREG

  • 🏭 Factory Direct — Full in-house manufacturing and surface treatment; no middlemen
  • 📐 DIN 6334 Compliant — Length precisely 3×d; all dimensions and tolerances verified against the standard
  • 📏 M3 to M56 — The widest size range available; from precision instruments to heavy structural applications
  • 🔬 Material Certified — Mill test certificates (MTC) available for all grades
  • 📦 Bulk Wholesale — Competitive MOQ; consistent lot quality for production lines
  • 🚢 Global Export — Shipped worldwide with full export documentation
  • 💬 Technical Support — Engineering team available for specification, custom lengths, and sourcing guidance
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