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Metal Insert Self Locking Nut (DIN 980M) SS-304 A2

DIN 980M All-Metal Insert Self-Locking Nut - SUS304 A2 Stainless Steel

FULLERKREG DIN 980M all-metal self-locking hex nuts are manufactured from SUS304 (A2) stainless steel with a passivated finish. The DIN 980M uses a metal collar insert at the top of the nut body to generate prevailing torque, providing consistent locking performance across a wide temperature range without any nylon component. Compliant with DIN 980M and ISO 7042 standards.

Product Overview

Parameter Details
Standard DIN 980M / ISO 7042
Type All-Metal Insert Self-Locking Hex Nut (Metal Collar Type)
Material SUS304 Stainless Steel (A2)
Grade A2-70
Surface Treatment Passivated (Bright Finish)
Thread Metric Coarse Thread (6H)
Size Range M3 to M24
Locking Mechanism Metal collar insert, no nylon, rated to 300 deg C
RoHS Compliant Yes
Brand FULLERKREG

Dimensional Data (DIN 980M)

All dimensions in millimeters (mm). Unit weight is approximate reference value based on SUS304 density 7.93 g per cm3.

Nominal Size Thread Pitch (mm) m Max (mm) Wrenching Height (mm) s Min (mm) s Max (mm) e Min (mm) Unit Weight (g/pc)
M3 0.5 3.70 1.60 5.32 5.50 6.01 approx 0.6
M4 0.7 4.20 2.70 6.78 7.00 7.66 approx 1.2
M5 0.8 5.10 3.50 7.78 8.00 8.79 approx 2.0
M6 1.0 6.00 3.70 9.78 10.00 11.05 approx 3.5
M7 1.0 7.00 4.20 10.73 11.00 12.12 approx 5.5
M8 1.25 8.00 5.40 12.73 13.00 14.38 approx 8.0
M10 1.5 10.00 6.30 15.73 16.00 18.90 approx 15
M12 1.75 12.00 8.10 17.67 18.00 21.10 approx 25
M14 2.0 14.00 9.90 21.67 22.00 24.49 approx 42
M16 2.0 16.00 11.70 23.67 24.00 26.75 approx 62
M20 2.5 20.00 13.80 29.16 30.00 32.95 approx 120
M24 3.0 24.00 16.90 35.00 36.00 39.55 approx 210

m = Total Nut Height | s = Width Across Flats | e = Width Across Corners | Unit weight values are approximate for reference only.

Prevailing Torque Requirements (DIN 980M / ISO 7042)

Minimum and maximum prevailing torque values for A2 stainless steel DIN 980M nuts, measured on 5th engagement of standard test bolt.

Size Min Prevailing Torque (Nm) Max Prevailing Torque (Nm) Min Proof Load (kN)
M3 0.05 0.40 1.53
M4 0.10 0.70 2.78
M5 0.20 1.20 4.46
M6 0.30 2.00 6.44
M8 0.80 5.00 11.8
M10 1.20 8.00 18.7
M12 2.00 12.0 27.3
M16 4.00 25.0 50.9
M20 6.00 40.0 80.2
M24 10.0 60.0 116.0

DIN 980M vs DIN 980V - Key Differences

Parameter DIN 980M (This Product) DIN 980V
Locking Type Metal Collar Insert Top Thread Deformation (Volcano)
Size Range M3 to M24 M6 to M20
Nut Height Taller (full height) Shorter profile
Torque Consistency More consistent across reuse Decreases with reuse
Applicable Standard DIN 980M / ISO 7042 DIN 980V / ASME B18.16.3M

Material and Mechanical Properties

Property Specification
Material Grade SUS304 / A2 Stainless Steel
Tensile Strength 700 MPa min
Proof Load Stress 580 MPa
Corrosion Resistance Excellent - suitable for marine, chemical, and outdoor environments
Temperature Range -196 to +300 deg C (all-metal, no nylon insert)
Magnetic Properties Generally non-magnetic; may exhibit slight magnetism after cold working
Chemical Composition C max 0.08%, Mn max 2.0%, Si max 1.0%, Cr 18-20%, Ni 8-10.5%, S max 0.03%, P max 0.045%

Selection Guide

Application Scenario Recommended Size Key Reason
Marine and Offshore Equipment M6 to M24 A2 SUS304 excellent salt-spray corrosion resistance
Food and Pharmaceutical Machinery M3 to M12 Non-toxic, easy to clean, hygienic stainless surface
High-Temperature Environments M3 to M24 All-metal collar rated to 300 deg C, no nylon degradation
Electronics and Precision Instruments M3 to M6 Non-magnetic A2, small sizes available, no interference
Chemical and Petrochemical Plants M8 to M24 Corrosion-resistant in acidic and alkaline environments

Standard Notes

  • DIN 980M specifies the metal collar insert type all-metal prevailing torque hex nut; equivalent to ISO 7042.
  • The metal collar at the top of the nut is deformed inward to create prevailing torque - no nylon or non-metallic insert used.
  • Nuts are reusable; prevailing torque remains more consistent across multiple assemblies compared to DIN 980V Volcano type.
  • Thread tolerance: 6H per ISO 965-1.
  • Passivation treatment removes free iron and enhances corrosion resistance per ASTM A380.
  • Compatible bolt grade: A2-70 or higher recommended.
  • Note: SUS304 may exhibit slight magnetic properties after cold working during manufacturing - this does not affect mechanical performance.

Product Gallery

DIN 980M A2 Stainless Steel All-Metal Self-Locking 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 980M / ISO 7042 tolerances.
Material Certification - Mill test reports and RoHS certificates available on request.
Corrosion Tested - Salt spray tested per ISO 9227 standard.
Flexible MOQ and 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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