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If you're a cyclist who cares about keeping your bike clean and hardware protected, exposed hex socket bolts on your stem, handlebar clamp, or brake levers are a constant nuisance — they collect mud, trap moisture, and eventually rust. These plastic hexagon head screw caps snap directly over M5 and M6 socket head screws to seal out dust, dirt, and water with zero tools required.
Each set includes 10 caps made from durable, lightweight plastic. Available in five colors — white, red, green, blue, and black — they fit standard metric M5 and M6 hex socket screws (typically 8–10 mm hex head diameter). The slotted outer profile allows easy removal with a flathead screwdriver when you need to access the bolt.
Ideal for mountain bike stem bolt covers, road bike handlebar clamp caps, e-bike accessory bolt protection, and general M5/M6 hex screw dust covers on exercise equipment or furniture hardware.
| Product Name | Hexagon Head Screw Cap / Hex Socket Screw Cover |
|---|---|
| Material | Plastic |
| Compatible Screw Sizes | M5, M6 (metric) |
| Head Style | Hexagon head / socket head |
| Drive Style | Slotted (for cap removal) |
| Colors Available | White, Red, Green, Blue, Black |
| Quantity per Pack | 10 pieces |
| Measurement System | Metric |
| Typical Applications | Bicycle stem, handlebar clamps, brake levers, derailleur bolts, exercise equipment, furniture hardware |
| Weight | See variant options |
Protect stem and handlebar hex bolts from trail mud, rain, and sweat. Keep hardware looking clean and prevent socket corrosion between service intervals.
Cover accessory mount bolts and display bracket hardware on e-bikes where moisture exposure is higher and bolt access is less frequent.
Use on M5 or M6 hex socket bolts in furniture, shelving, or exercise equipment to give a finished appearance and prevent dust buildup in the socket.
No — each pack contains caps for one size only, either M5 or M6. Select your required size when ordering. M5 caps are slightly smaller than M6 caps. Check your bike's bolt size before ordering; most stem bolts are M5, while some handlebar clamps use M6.
Both. Their primary function is to seal the hex socket from moisture, sweat, and mud. Water trapped inside a hex bolt socket causes rust over time and can strip the wrench interface. These caps create a barrier to keep bolts dry and clean.
Press the cap firmly onto the screw head until it sits flush — the plastic uses an interference fit to hold in place. For normal road and trail riding, they stay secure. Direct pressure washing may dislodge them. For a permanent fit, a small drop of silicone adhesive can be used, though most riders find the friction fit sufficient.
No — the cap covers the hex socket opening. To adjust the bolt, remove the cap first using a small flathead screwdriver or knife tip. The caps are reusable as long as they are not damaged during removal.
Yes — they fit any M5 or M6 hex socket head screw regardless of application. Common uses include furniture assembly bolts, exercise equipment, motorcycle accessories, and tool handles. Simply match the screw size.
Currently available in 10-piece sets. Order multiple sets if you need more. For bulk quantities or wholesale pricing, contact our customer service team.
The caps are made from impact-resistant plastic. They are generally suitable for typical outdoor riding temperatures. Extreme cold (below -20°C / -4°F) may increase brittleness, but for most cycling conditions they perform reliably.
