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Why are protective nut- and bolt caps applied?
Bolted and screwed connections are important structural elements and it may be necessary to protect them with a protective cap. Covering bolts and nuts with a protection cap or cover cap has a number of advantages:
- gives a visually more attractive finish
- increases safety; protruding parts are covered
- protects and preserves against external influences, such as damage, dirt, corrosion (rust) or UV and chemical action
- makes preservative coatings unnecessary
- simplifies service work, such as reviewing bolted connections
What types and sizes of protective nut and thread covers are available?
Verpas offers plastic nut and bolt caps for metric thread sizes from M3 ascending to M95 as well as for UNC ¼" to 3 ½". For protecting and covering internal threads, threaded holes and threaded fittings, a comprehensive range is available under our section Thread and bore protection
Plastic nut caps and cover caps are supplied in two varieties:
- De regular quality nut and bolt caps are suitable for a neat optical finish, increasing safety and, to a limited extent, preservation. As applied to furniture, playground equipment, trailers, etc.
- The industrial grade cover caps for nuts and threads are specifically suitable for preserving and protecting bolted joints and threaded ends. Applications include technical plants, construction, traffic, maritime, offshore and wind turbines, etc.
Protective nut and bolt caps are available in both fixed-heights and telescopic versions. It is also possible to protect washers, counter nuts or high nuts, or just uncovered threadeds. If that is not enough, there are also possibilities for customisation.
How are protective nut and bolt caps mounted?
Mounting a bolt and nut cap or cover cap can follow different principles. For example, there are self-clamping versions that simply clamp around the hexagon of a bolt or nut. There are also bolt and nut caps and covers that are screwed or clamped onto the thread. Finally, there is a two-part version with a base and a cover cap; this version is generally used in playground environments.
Cover caps for nuts and bolts - colours and customisation
Cover caps for bolts, nuts are available in various colours. Black, white and grey are common, although other colours are also possible. For the 2-piece secure cover caps for bolts and nuts attended for play equipment, a variety of colours is available as standard.
For more complex bolted joints, it is possible to supply customised cover caps and nut caps. Customisation is only possible with industrial-quality cover caps. For instance, customisation options such as extra height of space for HV washers, extra high nuts or to accommodate spacer bushings, etc. We will be happy to inform you about the possibilities. Contact
