Zinc-plated nylock nuts with a nylon insert that grips the bolt thread and prevents the nut working loose under vibration. Available in M5 through to M16. Sold in boxes of 100 for trade use.
Size
Price
QTY
M5
£0.85£1.02
M6
£1.52£1.82
M8
£2.00£2.40
M10
£5.28£6.34
M12
£8.35£10.02
M16
£16.26£19.51
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.
Pro Tip: Nylock nuts are technically single-use in safety-critical applications because the nylon insert deforms on first fitting and loses some of its locking force if removed and refitted — always use a fresh nut when disassembling and reassembling anything structural or load-bearing.
Zinc nylock nuts turn up on almost every type of construction and fabrication job. Steelwork connections, timber frame bolting, general bracketing, mechanical plant, agricultural machinery, and vehicle bodywork are all common territory. Anywhere a standard nut might work loose over time due to vibration or cyclic loading, a nylock is the sensible choice. They're also widely used in joinery and fitted furniture manufacture where you want a bolt assembly that stays put through years of use without needing to be checked.
Best For
Steel fabrication and structural bolting
Machinery and mechanical plant assembly
Agricultural and vehicle applications
Timber frame and construction bracketing
Joinery and fitted furniture
Any application subject to vibration or load cycling
Works With
Standard metric bolts and threaded rod
M5, M6, M8, M10, M12, M16 threads
Grade 4.6 and 8.8 bolts
Structural steel, timber, aluminium, and plastic substrates
Key Features
Nylon insert locks nut to prevent loosening
Zinc-plated steel for corrosion resistance
Full metric size range M5 to M16
Trade pack of 100 per box
No additional locking hardware required
Not suitable for: Not recommended for continuous high-temperature environments where the nylon insert may soften and lose its grip. These are also not intended for reuse in critical or load-bearing applications once removed from a bolt.
Run the nut down the bolt by hand until it reaches the nylon insert, then use a spanner to drive it home. You will feel increased resistance as the nylon begins to compress around the thread. Continue tightening to the required torque. The nut does not need any additional threadlocking compound or spring washer to function.
In safety-critical or structural applications, treat these as single-use fasteners. Once the nylon has been deformed by the first installation, its locking effectiveness is reduced. If you need to disassemble the joint, fit a new nylock nut on reassembly rather than reusing the original.
Select the correct nut size to match your bolt thread — M5 through M16 available
Run the nut down the bolt thread by hand until resistance increases at the nylon insert
Switch to a spanner and tighten through the nylon section to the required torque
Check that the bolt protrudes at least one full thread diameter beyond the nut once tightened
Do not reuse in structural or safety-critical applications after removal
Can I reuse zinc nylock nuts once they have been removed?
For general, non-critical assembly work, a nylock nut can be reused a limited number of times if it still feels tight on the thread. However, in structural, load-bearing, or safety-critical applications, always fit a new nut on reassembly. The nylon insert deforms on first use and some locking force is lost each time it is removed and refitted.
Are these suitable for outdoor use?
Yes, for most outdoor applications in sheltered or semi-exposed conditions the zinc plating offers adequate corrosion protection. They are not the best choice for fully exposed marine or coastal environments over the long term. If you need stronger corrosion resistance, stainless steel nylock nuts would be a better specification.
These nylock nuts are manufactured from steel with a zinc electroplated finish for corrosion protection. The locking element is a nylon insert bonded into the top of the nut, with an inside diameter slightly smaller than the nominal thread size. When tightened, the nylon deforms and grips the bolt thread, providing a mechanical lock that resists loosening under vibration and dynamic loading. They conform to DIN 985 standard for prevailing torque nylon insert nuts.
Material
Steel with zinc electroplate finish
Locking mechanism
Nylon insert (prevailing torque type)
Standard
DIN 985
Thread type
Metric ISO
Available sizes
M5, M6, M8, M10, M12, M16
Pack quantity
100 per box
Finish
Zinc plated
Size
M10, M12, M16, M5, M6, M8
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