Trek bottle cage bolts screw size
M5 · 15 to 18 mm long
The screws used on Trek bottle cage bolts are M5 in lengths from 15 to 18 mm.
Where it is used: sold explicitly as M5x0.8 hex socket bolts.
Head and drive, as the source states them: Hex socket (Allen) drive.
This entry is marked confirmed and comes from trekbikes.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.
Trek bottle cage bolts 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 | 15–18 mm | 0.8 mm | not stated | Hex socket (Allen) | sold explicitly as M5x0.8 hex socket bolts | Confirmed |
Fitment records and sources
sold explicitly as M5x0.8 hex socket bolts
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
How to check the screw before you buy
- Take one original screw out first and measure it before ordering; the record above tells you the thread, the original screw tells you the exact length and head.
- 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 15–18 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source names a Hex socket (Allen) drive. For comparison, standard M5 heads take PH2 (Phillips) or T25 (Torx), or a 4 mm hex key.
- 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
- Shimano SPD cleat bolts are widely sold as M5 x 8, but Shimano's own dealer manuals don't state the thread — check the old bolt.
- Inductive proximity sensors are sold by barrel thread (M5, M8, M12...) — the barrel is the thread, not a separate mounting screw.
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Devices whose records share a thread with Trek bottle cage bolts, closest length match first.
- Disc brake caliper post-mount adapters also M5 × 15–18 mm
- Wolf Tooth cage bolts also M5 × 16 mm
- TEKTELIC Kona Photon Gen-2 LoRaWAN gateway also M5 × 15–18 mm
- Husqvarna chainsaw/brushcutter hardware also M5 × 15–16 mm
- Angle grinder gear housing also M5 × 16–18 mm
- Bosch e-bike battery mounting/guide bolts also M5 × 15–18 mm
- Trek E-Bike RIB Battery Mount also M5 × 16 mm
- Cycling shoe cleat bolts also M5 × 15–16 mm
Questions about Trek bottle cage bolts screws
- What size screw does Trek bottle cage bolts use?
- M5 × 15–18 mm for sold explicitly as M5x0.8 hex socket bolts.
- How long are the screws in Trek bottle cage bolts?
- The records range from 15 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 Trek bottle cage bolts?
- The source lists a Hex socket (Allen) drive. Standard M5 heads otherwise take PH2 (Phillips) or T25 (Torx), or 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.