Home » DIN 980V Top Lock Nuts, Class 10, Alloy Steel, Zinc Finish, Coarse Thread

DIN 980V Top Lock Nuts, Class 10, Alloy Steel, Zinc Finish, Coarse Thread

DIN 980V All-Metal Prevailing Torque Lock Nut — Class 10, Alloy Steel 10B21, Zinc Cr3 Finish

FULLERKREG DIN 980V Class 10 all-metal prevailing torque hex lock nuts are manufactured from boron alloy steel 10B21 with Zinc Cr3 (trivalent chromate) surface treatment. As the highest standard grade in the DIN 980V series, Class 10 nuts deliver superior proof load capacity and prevailing torque performance, making them the preferred choice for critical structural joints, heavy machinery, and high-vibration environments. The top-locking (Volcano-type) design deforms the top threads to generate reliable locking torque without any nylon insert — fully compliant with DIN 980V and ASME B18.16.3M.

Product Overview

Parameter Details
Standard DIN 980V / ASME B18.16.3M
Type All-Metal Prevailing Torque Hex Lock Nut (Top-Locking / Volcano Type)
Material Alloy Steel 10B21 (Boron Steel)
Grade / Class Class 10 / 10.0
Surface Treatment Zinc Cr3 (Electrolytic Zinc + Trivalent Chromate Passivation)
Thread Metric Coarse Thread (6H)
Size Range M6 – M20
Hardness Rockwell C32–C39
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 based on alloy steel density ≈ 7.85 g/cm³.

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 5.7 4.9 ≈2.4
M8 1.25 13.00 12.73 14.38 7.5 6.6 ≈5.5
M10 1.50 17.00 16.73 18.90 9.0 8.0 ≈10.5
M12 1.75 19.00 18.67 21.10 11.0 10.0 ≈17
M16 2.00 24.00 23.67 26.75 14.0 13.0 ≈35
M20 2.50 30.00 29.16 32.95 18.0 16.9 ≈70

* s = Width Across Flats  |  e = Width Across Corners  |  m = Nut Height  |  Class 10 nuts have greater height (m) than Grade 8 for higher proof load. Unit weight values are approximate for reference only.

Prevailing Torque Requirements (DIN 980V — Class 10)

Class 10 nuts generate higher prevailing torque than Grade 8 due to greater nut height and harder material. Values per DIN 980V, measured on 5th engagement of standard test bolt.

Size Min Prevailing Torque (N·m) Max Prevailing Torque (N·m) Min Proof Load (kN)
M6 0.8 4.0 14.0
M8 1.5 8.0 25.6
M10 2.5 13.0 40.5
M12 4.0 20.0 59.2
M16 8.0 40.0 110.5
M20 13.0 65.0 174.0

Material & Mechanical Properties

Property Specification
Material Alloy Steel 10B21 (Boron-added medium-carbon steel)
Grade / Class Class 10 / 10.0 — highest DIN 980V strength class
Tensile Strength ≥ 1000 MPa
Proof Load Stress 900 MPa
Hardness Rockwell C32–C39
Heat Treatment Quenched & Tempered — mandatory for Class 10 per DIN 980V
Chemical Composition (10B21) C 0.18–0.23%, Mn 0.80–1.10%, B 0.0005–0.003%, S ≤ 0.035%, P ≤ 0.035%
Surface Treatment Zinc Cr3 — electrolytic zinc plating + trivalent chromate passivation (RoHS compliant, Cr6+ free)
Corrosion Resistance ≥ 72 hrs neutral salt spray (NSS) per ISO 9227
Temperature Range -50°C to +300°C (all-metal, no nylon insert)

Class 10 vs Grade 8 — Key Differences

Parameter Grade 8 Class 10 ★
Material 35K Carbon Steel 10B21 Boron Alloy Steel
Tensile Strength ≥ 800 MPa ≥ 1000 MPa
Proof Load Stress 600 MPa 900 MPa
Hardness C26–C36 C32–C39
Nut Height (m) M12 10.0 mm 11.0 mm
Recommended Bolt Grade 8.8 10.9 or higher

Selection Guide

Application Scenario Recommended Size Key Reason
Heavy-Duty Automotive (engine, drivetrain) M8 – M16 Class 10 high proof load + all-metal locking for extreme vibration
Construction & Steel Structures M12 – M20 Superior tensile strength for structural integrity under dynamic loads
Mining & Heavy Equipment M16 – M20 Highest proof load capacity in DIN 980V range
Wind Turbine & Energy Infrastructure M12 – M20 Fatigue-resistant boron steel with reliable prevailing torque
High-Temperature Industrial Joints M6 – M20 All-metal design rated to 300°C — no nylon degradation risk

Standard Notes

  • DIN 980V specifies the Volcano-type (top-locking) all-metal prevailing torque hex nut for metric coarse threads.
  • Class 10 is the highest strength class in DIN 980V — mandatory quench & temper heat treatment required.
  • Locking achieved by controlled deformation of top 2–3 threads; no insert required. Nuts are reusable but replace if prevailing torque falls below minimum.
  • Thread tolerance: 6H per ISO 965-1.
  • 10B21 boron steel provides superior hardenability vs plain carbon steel at equivalent carbon content.
  • Zinc Cr3 coating is RoHS compliant — free of hexavalent chromium (Cr6+), meeting EU ELV and RoHS directives.
  • Recommended mating bolt grade: 10.9 or higher. Do not pair with Grade 8.8 bolts in critical joints.
  • Do not use with stainless steel bolts — galvanic corrosion risk in wet environments.

Product Gallery

DIN 980V Class 10 Alloy 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 Class 10 tolerances.
🔬 Material Certification — Mill test reports, hardness certificates, heat treatment records, 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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