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FULLERKREG DIN 6923 Class 4 non-serrated hexagon flange nuts are manufactured from low carbon steel Q195, conforming to DIN 6923. The smooth (non-serrated) flange bearing surface distributes clamping load over a wider area without marking or damaging the mating surface — making these nuts the preferred choice for applications involving soft substrates, coated surfaces, or frequent re-assembly. Surface finish: bright zinc plated with trivalent chromium passivation (Zn + Cr3), providing reliable corrosion protection for general indoor and light outdoor applications. Thread: metric coarse (ISO 68-1). RoHS compliant.
| Thread (d) | Pitch (mm) | s — Width Across Flats (mm) | e — Width Across Corners (mm) | m — Nut Height (mm) | dc — Flange Dia. (mm) | c — Flange Thickness (mm) | Unit Weight (g) |
|---|---|---|---|---|---|---|---|
| M5 | 0.8 | 8 | 8.79 | 5.0 | 11.8 | 1.0 | 1.5 |
| M6 | 1.0 | 10 | 11.05 | 6.0 | 14.2 | 1.1 | 2.8 |
| M8 | 1.25 | 13 | 14.38 | 8.0 | 17.9 | 1.2 | 6.0 |
| M10 | 1.5 | 15 | 16.64 | 10.0 | 21.8 | 1.5 | 10.5 |
| M12 | 1.75 | 18 | 20.03 | 12.0 | 26.0 | 1.8 | 18.0 |
| M14 | 2.0 | 21 | 23.36 | 14.0 | 29.9 | 2.0 | 27.5 |
| M16 | 2.0 | 24 | 26.75 | 16.0 | 34.5 | 2.0 | 40.0 |
| M20 | 2.5 | 30 | 33.53 | 20.0 | 42.9 | 2.5 | 76.0 |
All dimensions in mm. Unit weight is approximate (calculated at steel density 7.85 g/cm³); actual weight may vary slightly by batch. Tolerances per DIN 6923. Zinc plating adds approximately 5–25 µm per side; verify fit with mating components before ordering in bulk. Dimensions are identical to the serrated variant; only the flange bearing surface differs.
| Parameter | Value |
|---|---|
| Standard | DIN 6923 |
| Type | Non-Serrated Hexagon Flange Nut |
| Material | Low Carbon Steel Q195 |
| Strength Class | Class 4 |
| Surface Treatment | Bright Zinc Plated + Trivalent Chromium Passivation (Zn Cr3) |
| Zinc Layer Thickness | 5–25 µm (per ISO 4042) |
| Flange Face | Smooth / Non-Serrated (surface-friendly) |
| Thread Type | Metric Coarse Thread (ISO 68-1) |
| Size Range | M5 – M20 |
| RoHS Compliant | Yes (Cr3 trivalent, hexavalent-chromium free) |
| Brand | FULLERKREG |
| Property | Value |
|---|---|
| Material | Low Carbon Steel Q195 |
| Strength Class | Class 4 |
| Proof Load Stress | 510 MPa |
| Tensile Strength (min.) | 400 MPa |
| Yield Strength (min.) | 320 MPa |
| Hardness | HV 130 – 302 |
| Elongation (min.) | 25% |
| Corrosion Resistance | Moderate — suitable for indoor & light outdoor use |
| Element | C | Si | Mn | P | S |
|---|---|---|---|---|---|
| Content (%) | ≤0.12 | ≤0.30 | ≤0.50 | ≤0.035 | ≤0.040 |
| Property | Detail |
|---|---|
| Plating Type | Electrolytic Zinc (Bright) |
| Passivation | Trivalent Chromium (Cr3) — RoHS compliant |
| Coating Thickness | 5–25 µm typical |
| Salt Spray Resistance | < 24 hours (white rust, standard supply) — 48h or 72h available upon request (custom order) |
| Appearance | Bright silver finish |
| Hexavalent Chromium (Cr6) | None — fully RoHS / REACH compliant |
| Property | Non-Serrated (Plain Flange) ✔ | Serrated Flange |
|---|---|---|
| Flange Bearing Surface | Smooth / plain | Toothed / serrated |
| Mating Surface Protection | ✔ No marking or damage | ⚠ Teeth bite into surface |
| Re-usability | ✔ Fully re-usable | ⚠ Limited (teeth wear) |
| Soft / coated substrates | ✔ Suitable (aluminium, plastics, painted) | ✖ May damage surface |
| Vibration resistance | Standard (use with washer if needed) | ✔ Enhanced (built-in locking) |
| Load distribution | ✔ Wide, even bearing area | ✔ Wide bearing area |
| Typical application | Precision, aesthetics, re-assembly | Vibration-prone joints |
| Requirement | Recommended Spec |
|---|---|
| Mating surface must not be marked or scratched | Non-Serrated Class 4 Zn ✔ |
| Aluminium, plastic, or painted substrate | Non-Serrated Class 4 Zn ✔ |
| Frequent disassembly / re-use required | Non-Serrated Class 4 Zn ✔ |
| General indoor / light structural assembly | Class 4 Zn Cr3 ✔ |
| RoHS / REACH compliant finish required | Cr3 trivalent passivation ✔ |
| 48h / 72h salt spray required | Custom order available — contact FULLERKREG |
| Vibration-prone joint (locking without washer) | Consider Serrated Class 4 Zn instead |
| Marine / outdoor / high-humidity environment | Consider A2 or A4 stainless steel instead |
| Higher strength requirement (> Class 4) | Consider Class 8 or Class 10 Zn instead |
DIN 6923 specifies hexagon flange nuts in both serrated and non-serrated (plain) variants. The non-serrated variant features a smooth flange bearing surface that spreads the clamping load without damaging the mating surface — making it suitable for soft materials, coated surfaces, and applications requiring repeated assembly. Bright zinc plating per ISO 4042 with trivalent chromium (Cr3) passivation ensures RoHS compliance and provides adequate corrosion protection for general engineering applications. FULLERKREG manufactures to the current edition of DIN 6923 with full dimensional traceability.
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🏭 Direct Manufacturer — No middlemen. Factory-direct pricing with full production traceability.
📐 DIN Precision — Every batch produced and inspected to DIN 6923 dimensional standards.
🔩 Wide Size Range — M5 through M20 in stock; non-standard sizes available on request.
📦 Flexible MOQ & Packaging — Bulk bags, small boxes, or custom retail packaging to your specification.
🌍 Global Shipping — Direct export from China; experienced with Amazon FBA inbound, sea freight, and air freight.
✅ RoHS & Material Certs — Mill certificates, RoHS declarations, and inspection reports available on request.
🤝 OEM / Private Label — Custom marking, packaging, and labeling for wholesale partners.
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