These plastic nut covers fit over matching hexagonal nuts and bolt heads to give exposed fixings a neat finish. Also known as nut protection caps, hex bolt covers or push-on nut caps, they have an internal hexagonal retaining feature that grips the fastener.
Choose the spanner size and colour using the options above. Black, grey, white, brown, green and graphite variants are available across the range; colour availability depends on size. There is no minimum order: buy one replacement cover or the quantity required for your project.
Use these covers on matching exposed fixings in fencing, metal frameworks, furniture and equipment assemblies. They conceal the nut or bolt head and provide a protective covering over the fastener.
Measure across two opposite flat sides of the nut or hexagonal bolt head. This is the spanner size (across flats), not the distance across the corners and not the diameter of the thread.
For example, a fixing measuring 13 mm across flats requires the 13 mm cover. The table pairs this size with M8, but check the actual spanner size: the thread designation alone does not confirm the dimensions of every fastener.
Check the available space around the fixing and the height of any thread projecting above the nut. The cover must have enough internal clearance to seat properly. Compare the dimensions below with the drawing before ordering.
All dimensions are in millimetres. Colour buttons select matching shop variants. Sizes marked “Available to order” are supplied to order. Please contact us to confirm the required size, colour, quantity, price and lead time before ordering. An X means that the dimension was not supplied.
| Type | Thread size | Spanner size | Choose colour | B | D | H | A |
|---|---|---|---|---|---|---|---|
| Nut / Bolt Cover | M5 | 8mm | Black Grey White Green Brown Graphite | 7.9 | 10.6 | 9.5 | 6.0 |
| Nut / Bolt Cover | M6 | 10mm | Graphite Green Brown White Grey Black | 9.9 | 12.3 | 13.4 | 7.3 |
| Nut / Bolt Cover | M8 | 13mm | Graphite Green Brown White Grey Black | 12.9 | 17.6 | 16.5 | 8.7 |
| Nut / Bolt Cover | M10 | 17mm | Brown Graphite Green White Grey Black | 16.9 | 21.6 | 20.3 | 10.1 |
| Nut / Bolt Cover | M12 | 19mm | Graphite Green Brown White Grey Black | 18.9 | 23.6 | 21.9 | 11.4 |
| Nut / Bolt Cover | M14 | 22mm | Graphite White Grey Black | 21.9 | 27.4 | 24.2 | 12.5 |
| Nut / Bolt Cover | M16 | 24mm | Brown Graphite Green White Grey Black | 23.9 | 29.6 | 27.2 | 14.0 |
| Nut / Bolt Cover | M18 | 27mm | Available to order | 26.5 | 33.3 | 30.3 | 17.4 |
| Nut / Bolt Cover | M20 | 30mm | Available to order | 29.0 | 36.5 | 33.5 | 18.0 |
| Nut / Bolt Cover | M22 | 32mm | Available to order | 31.3 | 38.9 | 36.0 | 20.0 |
| Nut / Bolt Cover | M24 | 36mm | Available to order | 34.5 | 43.9 | 39.3 | 20.2 |
| Nut / Bolt Cover | M30 | 46mm | Available to order | 45.8 | 56.0 | 51.3 | 24.8 |
| Nut / Bolt Cover | M33 | 50mm | Available to order | 48.7 | 59.5 | 56.2 | 28.3 |
| Nut / Bolt Cover | M36 | 55mm | Available to order | 54.1 | 66.0 | 58.0 | 29.2 |
| Nut / Bolt Cover | M39 | 60mm | Available to order | 59.5 | 72.0 | 61.0 | 34.6 |
| Nut / Bolt Cover | M42 | 64mm | Available to order | 64.0 | 76.6 | 63.0 | 36.6 |
| Nut / Bolt Cover | M45 | 70mm | Available to order | 68.4 | 84.0 | 88.4 | 34.5 |
These are push-on plastic covers for existing hexagonal fixings. They do not replace the nut or bolt and are not threaded dome nuts, tube bungs or hole plugs. For open-ended round tubing, see our round tube inserts and end caps.
Align the internal hexagonal shape with the nut or bolt head and press the correctly sized cover into place. If it will not seat, check the across-flats measurement, surrounding clearance and any projecting thread. Contact us with these measurements and a photograph if you need help choosing.
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