Nylon Insert Lock Nut (DIN 985 / DIN 982 / ISO 10511)
Nylon insert lock nuts have a polyamide ring at one end. As the nut is threaded onto the bolt, the bolt deforms the nylon, generating friction that resists loosening from vibration. DIN 985 is the standard (lower height) version; DIN 982 is the taller version.
Specifications
| Standards | DIN 985 (low), DIN 982 (high), ISO 10511, ISO 7040 |
|---|---|
| Property Class | 5, 8, 10 |
| Size Range | M3 – M48 |
| Temperature Limit | Continuous service typically up to ~120 °C (limited by nylon) |
| Reusability | Limited — typically 5-10 reuse cycles before locking torque drops significantly |
Frequently Asked Questions
How many times can a nylon lock nut be reused?
Industry guidance suggests 5-10 cycles before the prevailing torque drops below specification. For critical safety applications (lifting equipment, transport), use a new lock nut on each installation.
Can nylon insert lock nuts be used at high temperature?
Standard nylon (PA66) has a continuous service temperature of around 120 °C. Above this, the nylon softens and locking action is lost. For higher temperatures, use all-metal lock nuts (DIN 980), wedge-lock washers, or thread-locking adhesive.
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