The Nylon Insert Lock Nut (manufactured to DIN 985 / ISO 7040 standards) is the world’s most popular self-locking fastener. Also widely known as a “Nyloc Nut” or “Elastic Stop Nut,” this Nylon Insert Lock Nut features a captive, undersized blue nylon ring at the top. When the bolt threads enter this nylon insert, they deform the plastic elastically, creating a powerful compressive force (friction) that prevents the nut from loosening under vibration.
Product Overview: Our Nylon Insert Lock Nut is forged from high-quality Stainless Steel A2-70 (304) or A4-70 (316). Unlike standard nuts that require a separate lock washer, the Nylon Insert Lock Nut is a standalone vibration-proof solution, making it the standard choice for automotive suspension, aerospace components, and industrial machinery.
Nylon Insert Lock Nut Specifications
| Product Name | Nylon Insert Lock Nut / Nyloc Nut / DIN 985 |
| Standard | DIN 985 (Low Type) / ISO 7040 |
| Material Grade | Stainless Steel A2 (304) / A4 (316) |
| Insert Material | Nylon 66 (Blue or White) |
| Temperature Range | -40°C to +120°C (Standard Nylon Limits) |
Engineering Insight: How does a Nyloc work?
The magic of the Nylon Insert Lock Nut lies in the principle of “Prevailing Torque.”
- Elastic Memory: The internal diameter of the nylon ring is intentionally smaller than the bolt diameter. As the bolt turns, it doesn’t cut threads into the nylon; instead, it forces the nylon to stretch over the threads. The nylon tries to return to its original shape, squeezing the bolt tightly.
- Gas & Moisture Seal: Because the nylon wraps perfectly around the threads, a Nylon Insert Lock Nut also acts as a seal, preventing moisture from entering the thread path and causing internal rust.
Installation Warning
Because of the friction caused by the nylon insert, you cannot spin a Nylon Insert Lock Nut down by hand like a regular nut. You will need a wrench or socket to drive it once the bolt engages the nylon ring. This resistance confirms the locking mechanism is working.
For more details on self-locking nuts, please refer to the Nyloc nut entry on Wikipedia.
Material Guide: A2 vs A4
- A2 (304): Standard resistance. Ideal for drones, RC cars, and indoor equipment.
- A4 (316): Marine grade. Essential for boat fittings where salt spray would otherwise corrode the nut body.
Frequently Asked Questions (FAQ)
Q: Can I reuse a Nylon Insert Lock Nut?
A: Technically, yes, but we do not recommend it for critical joints. Every time you remove the nut, the nylon insert loses some of its elasticity (“memory”). The locking torque drops significantly after the first removal.
Q: Will the nylon melt?
A: Standard Nylon 66 inserts are safe up to 120°C (248°F). For high-heat applications (like exhaust manifolds), you should use our All-Metal Lock Nuts (DIN 980) instead.
Need Bulk Nyloc Nuts?
Handan Bolt is a premier manufacturer of the Nylon Insert Lock Nut. We stock sizes from M2 to M48. Contact us for wholesale pricing.
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