All-Metal Prevailing Torque Nuts
| Standard | DIN 980 · ISO 7042 / ISO 2320 |
|---|---|
| Material | Carbon Steel / Alloy Steel |
| Strength Grade | Grade 8 / 10 |
| Size Range | M6-M30 |
| Surface Treatment | Zinc Plated / Zinc Flake / Phosphate |
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Product Description
Product Description & Key Specifications
All-metal prevailing torque nuts are locking nuts used where vibration, dynamic load or elevated temperature makes nylon insert nuts unsuitable. They are supplied to ISO 7042, DIN 980 and ISO 2320 references in carbon steel or alloy steel, with Grade 8 / 10 strength options and M6-M30 size coverage.
The locking function is created by controlled thread deformation or top-lock geometry that generates prevailing torque during installation. Selection should confirm bolt grade, thread class, installation torque, reuse policy, coating, lubrication and whether the assembly operates near heat, vibration or maintenance-sensitive equipment.
Zinc plated nuts are common for general construction and machinery, zinc flake coating supports corrosion protection with controlled coating thickness, and phosphate finish is used for selected industrial or high-friction assemblies. These nuts are frequently specified for rail bogies, construction equipment, machinery frames, engine-adjacent assemblies and structural accessories.
| Product type | All-metal prevailing torque nuts / metal lock nuts |
|---|---|
| Standards | ISO 7042 / DIN 980 / ISO 2320 |
| Material | Carbon steel / Alloy steel |
| Strength grade | Grade 8 / 10 |
| Size range | M6-M30 |
| Common models | M6, M8, M10, M12, M16, M20, M24, M30 |
| Thread type | Metric thread with prevailing torque locking feature |
| Surface finish | Zinc plated / Zinc flake / Phosphate |
| Matched hardware | Metric bolts, double-end studs, threaded rods and machinery fasteners |
| Documentation | CoC, MTC, prevailing torque or dimensional report on request |
Dimensions & SpecificationsDIN 980 / ISO 7042
Technical Drawing
Dimensional Table
| Parameter | M3 | M4 | M5 | M6 | M7 | M8 | M10 | M12 | M14 | M16 |
|---|---|---|---|---|---|---|---|---|---|---|
| P | 0.5 | 0.7 | 0.8 | 1 | 1 | 1|1.25 | 1|1.25|1.5 | 1.25|1.5|1.75 | 1.5|2 | 1.5|2 |
| e/min | 6.01 | 7.66 | 8.79 | 11.05 | 12.12 | 14.38 | 18.9 | 21.1 | 24.49 | 26.75 |
| k/max | 3.7 | 4.2 | 5.1 | 6 | 7 | 8 | 10 | 12 | 14 | 16 |
| k/min | 3.4 | 3.9 | 4.8 | 5.7 | 6.5 | 7.5 | 9 | 11 | 12 | 14 |
| s/max | 5.5 | 7 | 8 | 10 | 11 | 13 | 17 | 19 | 22 | 24 |
| s/min | 5.32 | 6.78 | 7.78 | 9.78 | 10.73 | 12.73 | 16.73 | 18.67 | 21.67 | 23.67 |
Engineering references
Technical resources
Review the applicable dimensions, drawing and standard relationship before confirming the ordered specification.02
Selection
Selection Advantages by Application
Railway and Vibration Assemblies
All-metal lock nuts are used in selected rail bogie, bracket and equipment connections where vibration resistance is needed and non-metallic inserts are not preferred.
Railway fastenersConstruction Equipment and Machinery
Grade 8 / 10 DIN 980 nuts support machinery frames, guards, chassis brackets and equipment connections exposed to impact or repeated service loads.
Construction fastenersHeat-Adjacent Industrial Assemblies
Because the locking feature is metal rather than nylon, these nuts are considered for engine-adjacent, exhaust-adjacent or industrial heat environments where the full assembly specification permits them.
Industrial equipment fasteners03
Assembly
Recommended Matching Products
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Manufacturing
Manufacturing & Quality Control
Manufacturing CapabilityQuality Control
Cold forming, hot forming or machining of nut blanksCarbon steel / alloy steel material and grade verification
Tapping and controlled prevailing torque feature formingThread gauge, prevailing torque and dimensional inspection by lot
Zinc plated, zinc flake or phosphate surface treatmentCoating thickness, thread fit and visual inspection after finish
Grade 8 / 10 lock nut supply by ISO / DIN referenceProof load, hardness and marking checks when specified
Carton, bulk or project kit packagingMTC, CoC and inspection reports prepared on request
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FAQ
Common Questions Before RFQ
When should I use all-metal prevailing torque nuts?
Use them when the joint needs resistance to loosening and nylon insert nuts are not suitable because of heat, chemical exposure or project specification.
How do all-metal lock nuts work?
They use controlled thread deformation or top-lock geometry to create prevailing torque as the nut is installed on the bolt or stud.
Are they reusable?
Reuse depends on the standard, torque performance after removal and project rules. Critical assemblies should define a reuse policy before installation.
Which finish should I choose?
Zinc plated is common for general use, zinc flake supports higher corrosion performance with controlled thickness, and phosphate is used for selected industrial assemblies.
What RFQ details are required?
Send standard, size, grade, finish, mating bolt grade, application temperature or vibration conditions, quantity and certificate requirements.
Need all-metal prevailing torque nuts?
Send size, grade, standard, finish, mating bolt or stud, application conditions and documentation needs. We can quote ISO 7042 / DIN 980 lock nuts for railway, machinery and construction equipment assemblies.
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