Nylock Nylon Nuts – Zinc – Box of 100

Zinc nylock nuts are one of those fixings that sit quietly in the background doing an important job. The principle is simple: a nylon insert at the top of the nut has a slightly smaller inside diameter than the thread it’s going onto. When you tighten the nut down, that nylon collar bites into the bolt thread and grips. The nut doesn’t back off. It stays exactly where you put it, even when things vibrate, flex, or shift over time.

These are zinc-plated steel nuts, which gives them decent corrosion resistance for general site and workshop use. The zinc finish keeps surface rust at bay in most conditions, making them suitable for both indoor structural work and sheltered external applications. They won’t last forever in fully exposed coastal environments, but for the vast majority of jobs they’re more than up to it.

Where Zinc Nylock Nuts Get Used

The locking action is what makes these worth specifying over a plain nut in any application where vibration is a factor. Machinery, vehicle work, agricultural equipment, steel fabrication — anywhere the assembly moves, shakes, or is subject to load cycling. Furniture frames bolted together, timber structures, general construction brackets, RHS and SHS connections. The list is fairly long.

Standard plain nuts rely on friction alone to stay put. That friction reduces over time. A zinc nylock nut adds a mechanical element to the equation, which is why engineers reach for them as a default in anything that moves.

Size Range and Trade Pack Format

These are available in M5, M6, M8, M10, M12, and M16, which covers the majority of bolt sizes you’ll encounter across construction, fabrication, and general engineering. Sold in boxes of 100, they’re priced to make sense for working in volume rather than picking a handful off a hardware shop peg. If you’re bolting a steel structure together or fitting off a batch of machinery, having a full box to hand saves the usual small-quantity frustration.

The nylon insert does mean these nuts are intended for single use in critical applications. Once the nylon has been compressed around a thread, some of that grip is spent. For anything structural or safety-related, fit a new nut each time. For general assembly work where you’re putting it together once and leaving it, that’s not something you’ll need to think about.

Zinc nylock nuts in the full M5 to M16 range, 100 per box, priced for trade. Straightforward product, does what it says.