Material
Stainless Steel
Type
All-metal prevailing-torque nut
Size Range
M5–M30
Surface Finish
Plain / Passivated
Class
A2-70 / A4-80
Standard
DIN 980V / ISO 7042
Packaging
Carton / Pallet
MOQ
1 piece (sample)
Precision Manufacturing, Batch After Batch
From cold-heading raw steel wire to heat-treated finished bolts, every step runs under strict in-house process control — ensuring the dimensional accuracy and strength grade printed on every head marking.
Product Overview
Application Scenarios
All-metal hex lock nuts (DIN 980V, also called stover or one-piece prevailing-torque nuts) have a slightly pinched top crown whose distorted threads grip the bolt and resist loosening under vibration — with no nylon insert, so they work at high temperature. Widely used in engines, exhaust systems, machinery and any hot or heavy-duty joint where a nylon-insert nut would fail. The metal locking action gives reliable, reusable prevailing torque.
Installation Notes
Thread the nut on with the pinched (locking) crown facing away from the joint. It will feel stiff as the distorted top threads engage — that prevailing torque is normal and is what stops the nut backing off. Run it down to the mating surface and tighten to the specified torque. Because locking is all-metal, these nuts suit high temperatures and heavy vibration where nylon-insert nuts are not rated.
Material & Certification
Manufactured from austenitic stainless steel — A2-70 (AISI 304) or A4-80 (AISI 316) — to ISO 3506-2 and produced to DIN 980V / ISO 7042, with a distorted all-metal locking crown. The corrosion-resistant metal locking suits outdoor, marine and high-temperature joints. Every batch is traceable to raw material certificates; each run passes 100% dimensional and prevailing-torque inspection; EN 10204 3.1 certificates available on request.
All-Metal Hex Lock Nut
Stainless Steel All-Metal Lock Nut · A2-70 / A4-80 · 304 / 316 · DIN 980V
Dimensional Specifications
DIN 980V / ISO 7042 Standard Reference Dimensions — click a size to locate it below
| Thread Size | Width Across Flats s (mm) | Total Height m (mm) |
|---|---|---|
| M5 | 8 | 5.0 |
| M6 | 10 | 6.0 |
| M8 | 13 | 8.0 |
| M10 | 17 | 10.0 |
| M12 | 19 | 12.0 |
| M16 | 24 | 16.0 |
Reference dimensions per DIN 980V / ISO 7042 standard. Full size range M5–M30 available on request — contact us for custom specification sheets.
Applications
Construction
Steel structures, bridges, buildings, concrete anchors
Machinery
Heavy equipment, industrial machines, manufacturing
Infrastructure
Railways, towers, pipelines, power transmission
Automotive
Vehicle assembly, chassis, engine components
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