What Is a DIN 985 Nylon Lock Nut?
DIN 985 Nylon Insert Lock Nuts
ISO Equivalent: ISO 7040 | Nyloc® Style Prevailing Torque Nuts
DIN 985 specifies hexagon nuts with a nylon locking insert that provides reliable vibration resistance. The nylon collar deforms around the bolt threads, creating friction that prevents loosening without chemical adhesives.
Quick Specifications
Dimension Chart
| Size | Pitch (mm) | Wrench Size | Height |
|---|---|---|---|
| M3 | 0.5 | 5.5 mm | 4.0 mm |
| M4 | 0.7 | 7 mm | 5.0 mm |
| M5 | 0.8 | 8 mm | 5.0 mm |
| M6 | 1.0 | 10 mm | 6.0 mm |
| M8 | 1.25 | 13 mm | 8.0 mm |
| M10 | 1.5 | 16 mm | 10.0 mm |
| M12 | 1.75 | 18 mm | 12.0 mm |
| M16 | 2.0 | 24 mm | 16.0 mm |
| M20 | 2.5 | 30 mm | 20.0 mm |
Key Advantages
Vibration Resistant
Nylon insert grips threads, preventing loosening under dynamic loads and vibration.
Cost Effective
Most economical prevailing torque lock nut for general applications below 120°C.
Thread Protection
Soft nylon insert won't damage bolt threads during assembly.
⚠️ Temperature Limit
Nylon insert softens above 120°C (248°F). For high-temperature applications, use DIN 980 all-metal lock nuts instead.
💡 DIN 985 vs ISO 7040
Fully interchangeable — Both standards define nylon insert lock nuts with identical dimensions and locking torque requirements.
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The most popular lock nut for vibration-prone assemblies. Steel and stainless available.
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