Fair Wind Fasteners

316/A4 Stainless Metric Nyloc Lock Nuts

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316 Stainless Steel (A4) DIN 985 Metric Nyloc Lock Nuts

When vibration and movement threaten to loosen ordinary nuts, DIN 985 nylon insert lock nuts provide a proven mechanical locking solution. Our DIN 985 lock nuts are manufactured from A4 grade 316 stainless steel and fitted with a precision molded nylon insert that resists loosening even under shock, vibration, and cyclic loading.

These nuts are designed to meet the DIN 985 standard, which specifies the thread form, nut height, and locking insert position to ensure consistent performance. As the bolt is tightened, the threads engage the nylon insert, creating friction that prevents the nut from backing off while still allowing the fastener to be removed and reused when needed.

This makes DIN 985 lock nuts ideal for:

Marine and offshore hardware
Engines and mechanical systems
Deck hardware and rigging attachments
Trailers and towing equipment
Machinery and equipment frames
Automotive and industrial assemblies

Unlike standard hex nuts, nylon insert lock nuts maintain preload even when exposed to vibration, making them critical in environments where fasteners are constantly being worked loose.

Why DIN 985 Matters

DIN 985 defines the nut geometry, thread tolerance, and insert placement so that locking force is consistent from nut to nut. These are not generic nylock nuts. They are precision metric locking fasteners designed to work properly with metric bolts and threaded rod.

A proper DIN 985 nut grips the threads firmly without damaging them, ensuring reliable locking without compromising fastener strength.