Home » DIN 980V Top Locknut, Grade 8, Steel, Zinc Finish, Coarse Thread

DIN 980V Top Locknut, Grade 8, Steel, Zinc Finish, Coarse Thread

DIN 980V All-Metal Prevailing Torque Lock Nut — Grade 8, Steel, Zinc Cr3 Finish

FULLERKREG DIN 980V Grade 8 all-metal prevailing torque hex lock nuts are manufactured from 35K medium-carbon steel with a Zinc Cr3 (trivalent chromate) surface treatment. The top-locking (Volcano-type) design permanently distorts the top threads to generate prevailing torque without any nylon insert, delivering reliable vibration resistance across a wide temperature range. Compliant with DIN 980V and ASME B18.16.3M standards.

Product Overview

Parameter Details
Standard DIN 980V / ASME B18.16.3M
Type All-Metal Prevailing Torque Hex Lock Nut (Top-Locking / Volcano Type)
Material 35K Medium-Carbon Steel
Grade Grade 8 / 8.0
Surface Treatment Zinc Cr3 (Trivalent Chromate Passivation)
Thread Metric Coarse Thread (6H)
Size Range M6 – M20
Hardness Rockwell C26–C36
RoHS Compliant Yes (Cr3 trivalent, hexavalent-chromium free)
Brand FULLERKREG

Dimensional Data (DIN 980V)

All dimensions in millimeters (mm). Unit weight is approximate reference value.

Nominal Size Thread Pitch (mm) s Max (mm) s Min (mm) e Min (mm) m Max (mm) m Min (mm) Unit Weight (g/pc)
M6 1.00 10.00 9.78 11.05 5.0 4.4 ≈2.2
M8 1.25 13.00 12.73 14.38 6.5 5.8 ≈5.0
M10 1.50 17.00 16.73 18.90 8.0 7.2 ≈9.5
M12 1.75 19.00 18.67 21.10 10.0 9.0 ≈15
M16 2.00 24.00 23.67 26.75 13.0 12.0 ≈32
M20 2.50 30.00 29.16 32.95 16.0 15.0 ≈62

* s = Width Across Flats  |  e = Width Across Corners  |  m = Nut Height  |  Unit weight values are approximate for reference only (carbon steel density ≈ 7.85 g/cm³).

Prevailing Torque Requirements (DIN 980V)

Minimum and maximum prevailing torque values per DIN 980V for Grade 8 steel nuts. Values measured on 5th engagement of standard test bolt.

Size Min Prevailing Torque (N·m) Max Prevailing Torque (N·m) Min Proof Load (kN)
M6 0.5 3.0 11.2
M8 1.0 6.0 20.5
M10 1.5 9.0 32.4
M12 2.5 14.0 47.4
M16 5.0 28.0 88.4
M20 8.0 45.0 139.0

Material & Mechanical Properties

Property Specification
Material 35K Medium-Carbon Steel
Grade Grade 8 / 8.0
Tensile Strength ≥ 800 MPa
Proof Load Stress 600 MPa
Hardness Rockwell C26–C36
Heat Treatment Quenched & Tempered to meet DIN 980V Grade 8 mechanical requirements
Chemical Composition C 0.32–0.38%, Mn 0.50–0.80%, Si 0.17–0.37%, S ≤ 0.035%, P ≤ 0.035%
Surface Treatment Zinc Cr3 — electrolytic zinc plating + trivalent chromate passivation (RoHS compliant, hexavalent-Cr free)
Corrosion Resistance ≥ 72 hrs neutral salt spray (NSS) per ISO 9227
Temperature Range -50°C to +300°C (all-metal, no nylon insert)

Selection Guide

Application Scenario Recommended Size Key Reason
Automotive Chassis & Suspension M8 – M16 Grade 8 high strength + prevailing torque resists vibration loosening
Heavy Machinery & Equipment M12 – M20 High proof load capacity for structural joints under dynamic load
Steel Structures & Frames M10 – M20 Cost-effective carbon steel with zinc corrosion protection
High-Temperature Environments M6 – M20 All-metal design rated to 300°C — no nylon degradation risk
General Industrial Fastening M6 – M16 Economical Grade 8 steel with reliable locking performance

Standard Notes

  • DIN 980V specifies the Volcano-type (top-locking) all-metal prevailing torque hex nut for metric coarse threads.
  • Locking is achieved by controlled deformation of the top 2–3 threads — no insert required, suitable for repeated assembly.
  • Prevailing torque may decrease after repeated use; replace if torque falls below minimum specification per DIN 980V.
  • Thread tolerance: 6H per ISO 965-1.
  • Zinc Cr3 coating is RoHS compliant — free of hexavalent chromium (Cr6+), meeting EU ELV and RoHS directives.
  • Recommended mating bolt grade: Grade 8.8 or higher.
  • Do not use with stainless steel bolts — galvanic corrosion risk in wet environments.

Product Gallery

DIN 980V Grade 8 Steel Zinc Lock Nut — actual product photos:

[Photo 1] [Photo 2] [Photo 3] [Photo 4]

Why Choose FULLERKREG

🏭 Direct Manufacturer — Factory-direct pricing with full production traceability.
📐 Strict Dimensional Control — 100% inspection against DIN 980V tolerances.
🔬 Material Certification — Mill test reports, hardness certificates, and RoHS declarations available on request.
🛡️ Salt Spray Tested — Zinc Cr3 coating verified per ISO 9227 neutral salt spray test.
📦 Flexible MOQ & Packaging — Bulk bags, boxes, or custom retail packaging available.
🚢 Global Shipping — FBA-ready export packaging, direct China-to-warehouse shipping.
⚙️ OEM Services — Custom marking, packaging, and certification documentation supported.

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