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Chamfered Square Nuts (DIN 557) - Stainless Steel (A2)

Chamfered Square Nuts (DIN 557) — Stainless Steel A2 (SUS304)

FULLERKREG DIN 557 chamfered square nuts are manufactured from austenitic stainless steel grade A2 (SUS304), offering excellent corrosion resistance and mechanical strength. The chamfered top face provides a clean, professional appearance and facilitates easy assembly. Ideal for structural, mechanical, and industrial fastening applications where corrosion resistance is critical.

Product Specifications

Property Details
Standard DIN 557
Type Chamfered Square Nut
Material Stainless Steel SUS304 (A2)
Surface Treatment Pickled & Passivated (Bright Finish)
Thread Type Metric Coarse Thread (ISO 68-1)
Size Range M5 – M16
RoHS Compliant Yes
Magnetic Properties Slightly magnetic (inherent to austenitic SS after cold working)

Dimensional Data (DIN 557 · Unit: mm)

Thread Size
d		 Pitch
(mm)		 Nut Height m (mm) Min Wrenching
mw (mm)		 Across Flats s (mm) Across Corners e (mm) Bearing Dia.
dw min (mm)		 Est. Unit Weight
(g/pc)
max min max min max min
M5 0.8 4.00 3.52 2.50 8.00 7.64 11.30 9.93 6.70 ~1.5
M6 1.0 5.00 4.52 3.20 10.00 9.64 14.10 12.53 8.70 ~2.8
M8 1.25 6.50 5.92 4.10 13.00 12.57 18.40 16.34 11.50 ~6.0
M10 1.5 8.00 7.42 5.20 17.00 16.57 24.00 21.54 14.50 ~11.5
M12 1.75 10.00 9.42 6.60 19.00 18.57 26.90 24.02 16.50 ~17.0
M16 2.0 13.00 12.30 8.60 24.00 23.16 33.90 30.11 22.00 ~38.0

* Dimensions per DIN 557. Unit weight values are approximate references for SUS304 material density (7.93 g/cm³). Actual weight may vary slightly by batch. Data is strictly informative.

Selection Guide

Application Scenario Recommended Size Reason
Light-duty electronics / instrument panels M5 – M6 Compact profile, easy torque control
General mechanical assemblies M8 – M10 Balanced strength and wrench clearance
Structural / heavy-duty industrial M12 – M16 High clamping force, wide bearing surface
Outdoor / marine / food-grade environments All sizes A2 SUS304 corrosion resistance
T-slot / channel framing systems M8 – M12 Square profile locks into slot without rotation

Standard & Compliance

DIN 557 specifies chamfered square nuts with metric coarse threads. The standard defines geometry, tolerances, and mechanical requirements. FULLERKREG DIN 557 A2 nuts comply with:

  • DIN 557 — Chamfered Square Nuts (superseded in part by ISO 4032 for hex nuts, but DIN 557 square nut geometry remains the industry reference)
  • ISO 3506-2 — Mechanical properties of stainless steel nuts (Property Class A2-70)
  • ISO 68-1 — Metric screw thread profile
  • RoHS Directive — Restriction of Hazardous Substances compliant

Material & Surface

  • Material: Austenitic Stainless Steel SUS304 / AISI 304 / EN 1.4301 (A2)
  • Surface: Pickled & Passivated — bright, oxide-free finish that maximizes corrosion resistance
  • Tensile Strength: ≥ 500 MPa (A2-50) / ≥ 700 MPa (A2-70)
  • Proof Load Stress: Per ISO 3506-2 Annex F
  • Note: All austenitic stainless steel fasteners may exhibit slight magnetic properties due to cold working during manufacturing. This does not affect corrosion resistance or mechanical performance.

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Why FULLERKREG

  • 🏭 Direct Manufacturer — Factory-direct pricing with full traceability from raw material to finished fastener
  • 📐 Precision Conformance — Strict dimensional inspection per DIN 557; CMM-verified critical dimensions
  • 🔬 Material Certification — Mill test reports (MTR) and RoHS certificates available on request
  • 📦 Flexible MOQ — Bulk pallet quantities or sample packs; custom packaging available
  • 🌍 Global Shipping — Export experience to 50+ countries; sea, air, and express logistics supported
  • ⚡ Fast Lead Time — In-stock standard sizes ship within 3–5 business days
  • 🤝 B2B Wholesale — Volume pricing tiers, OEM labeling, and long-term supply agreements available

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