Bicycle bottle cage bosses (near universal) screw size
M5 · 12 to 18 mm long
Our records put Bicycle bottle cage bosses (near universal) on M5 screws in lengths from 12 to 18 mm.
Where it is used: M5x0.8 braze-ons on down tube and seat tube.
This entry is marked confirmed and comes from specialized.com.
An M5 screw is 5 mm in diameter with a 0.8 mm pitch, tapped with a 4.2 mm drill; imperial look-alike: #10-32 (4.83 mm) — the other common rack thread; check before mixing.
Bicycle bottle cage bosses (near universal) screw specifications
One row per fitment record. Head, drive are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Where it goes | Status |
|---|---|---|---|---|---|---|
| M5 | 12–18 mm | 0.8 mm | not stated | not stated | M5x0.8 braze-ons on down tube and seat tube | Confirmed |
Fitment records and sources
M5x0.8 braze-ons on down tube and seat tube
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
How to check the screw before you buy
- Where the manufacturer publishes a torque value, use a torque driver rather than feel.
- Diameter: across the threads an M5 screw measures about 5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.8 mm from one thread crest to the next (12.5 crests per centimetre). A thread pitch gauge or the pitch-gauge tool settles it in seconds.
- Length: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
- The records span 12–18 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M5 heads take PH2 for Phillips and T25 for Torx, and a 4 mm hex key for socket heads; a bit that fits loosely will cam out and strip the head.
- Tightening: no device-specific torque is published in these records. The site's general figure for M5 is about 4.0-6.0 N·m into metal threads and 1.5-2.5 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M5
- APC Easy PDU rack-mount screws are self-tapping M5x10, intended for the PDU's own mounting brackets rather than standard rack cage-nut threads.
- Wheelchair and mobility OEM screws specify an exact standard and strength class (ISO 7045 CL4.8, ISO 4762 CL12.9). Matching only the thread size can cause a failure under load.
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Devices whose records share a thread with Bicycle bottle cage bosses (near universal), closest length match first.
- VMAC Multifunction Power System D600007 also M5 × 14 mm
- Motorcycle windscreen also M5 × 12–16 mm
- Bicycle stem faceplate bolts also M5 × 18 mm
- Vespa Primavera 125 4T 3V ie ABS E5 instrument cluster also M5 × 16 mm
- Bicycle water bottle cage mounts also M5 × 12–18 mm
- Bicycle 6-bolt disc brake rotors (Shimano/SRAM/Magura) also M5 × 12–13 mm
- SPD-SL / Look 3-hole cycling cleats also M5 × 12–18 mm
- Bicycle water bottle cage bolts also M5 × 16 mm
Questions about Bicycle bottle cage bosses (near universal) screws
- What size screw does Bicycle bottle cage bosses (near universal) use?
- M5 × 12–18 mm for M5x0.8 braze-ons on down tube and seat tube.
- How long are the screws in Bicycle bottle cage bosses (near universal)?
- The records range from 12 to 18 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M5 screw?
- 0.8 mm (coarse), which is the standard pitch for M5 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 4.2 mm and the normal clearance hole is 5.5 mm.
- What screwdriver do I need for Bicycle bottle cage bosses (near universal)?
- The sources do not name the drive. For M5, Phillips heads normally take PH2 and Torx heads T25; socket heads take a 4 mm hex key.
- Can I use an imperial screw instead of M5?
- No. Imperial look-alike: #10-32 (4.83 mm) — the other common rack thread; check before mixing. Use a true M5 screw so it does not cross-thread or strip the hole.