Fastener protection caps that shield external nuts and bolts from water, dust and corrosion while giving a neat, finished look. Professional installers and DIYers will find TERF Hex Nut and Bolt Dome Caps reduce maintenance and improve appearance. Are M8 (13mm spanner) caps the right fit for your project?
⚡ At a Glance
- • Durability: High-quality PE plastic resists deformation, UV and low temperatures
- • Best for: Maintenance teams, outdoor fixtures and industrial installations exposed to weather
- • Not ideal for: Non-hexagonal or non-M8 fastenings where a 13mm spanner does not fit
Designed for M8 hexagon nuts and bolts with a 13mm spanner fit. Pack of approximately 20 caps made from PE plastic to protect against rust, dust and weathering.
Long-term rust protection – thanks to high-quality PE plastic
PE plastics are corrosion resistant and block moisture and dust while resisting ultraviolet degradation and low-temperature brittleness. The material’s toughness reduces the risk of cracking or deforming in outdoor conditions.
External fixings remain protected from rust and grime, cutting down on replacement and cleaning needs over time.
Neat, professional finish – with dome cap design
Dome-shaped caps fully cover hex heads and exposed threads, presenting a smooth external profile. The hexagonal outer form ensures the cap sits flush with surrounding hardware.
Bolts and nuts look tidier on railings, street lights and equipment, improving visual appearance while concealing weathered fixings.
Quick fit and removal – with M8 hexagon sizing for 13mm spanner
Caps are sized for M8 hexagon nuts and bolts and are described as easy to fit and remove, compatible with a 13mm spanner for secure seating or removal. Accurate sizing reduces the chance of mismatched orders.
Installation works well for medium-scale maintenance jobs, and precise measurements help ensure reliable, repeatable fitting.
✨ The 4 Key Reasons for TERF Hex Nut and Bolt Dome Caps
- PE plastic construction – provides robust weather and UV resistance over time
- M8 (13mm) compatibility – ensures accurate fit for common hexagon fixings
- Pack of approximately 20 – convenient quantity for maintenance and repair jobs
- Wide industrial application – suitable for machines, pipelines, bridges and street lighting
📋 Technical Details at a Glance
- Category: Fastener protection caps
- Material: High-quality PE plastic
- Size compatibility: M8 hexagon nuts and bolts
- Spanner compatibility: 13mm spanner
- Pack size: Approx 20 pieces
❓ Frequently Asked Questions
Q: Are these caps suitable for M8 nuts and bolts?
A: Yes, caps are intended for hexagon shaped M8 nuts and bolts and are sized for a 13mm spanner.
Q: What material are the caps made from?
A: Made from high-quality PE plastics that resist corrosion, ultraviolet rays and low temperatures while remaining tough and lightweight.
Q: Where can these caps be used?
A: Suitable for machine equipment, petrochemical installations, valves, gas pipelines, bridge base guardrails and street lighting, among other external applications.
🏆 Our Verdict
Suitable for maintenance teams, facilities managers and DIYers who need to protect and tidy exposed fixings. Durable PE construction, accurate M8 sizing and a dome cap design combine to reduce corrosion and present a neat finish. Offers strong long-term value by lowering maintenance frequency and prolonging the life of external fastenings.
