Bicycle bottle cage boss screw size
M5 · 10 to 18 mm long
If you are replacing a screw on Bicycle bottle cage boss, the thread is M5 in lengths from 10 to 18 mm.
The record covers bottle cage to the down tube or seat tube.
This entry is marked confirmed and comes from parktool.com.
M5 means a 5 mm nominal diameter with a 0.8 mm thread pitch. Imperial look-alike: #10-32 (4.83 mm) — the other common rack thread; check before mixing.
Bicycle bottle cage boss 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 | 10–18 mm | 0.8 mm | not stated | not stated | bottle cage to the down tube or seat tube | Confirmed |
Fitment records and sources
bottle cage to the down tube or 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
- On vehicles and bikes, use the original strength class and finish; outdoor hardware is usually stainless or coated to resist corrosion.
- 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 10–18 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
- Truss and stage-light clamps use M8 or M10 bolts depending on tube diameter — larger than anything in this database, so don't substitute an M6.
- 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.
Buy these screws at TechSpare Warehouse
In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.
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M5 x 10mm Black Wafer Head Bike Fender & Rack Screws for Tern MTR Fenders, Blackburn EX-1 Rack, ENVO Stax & René Herse Fender Set – 10-Pack Replacement
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M5 x 10mm Black Wafer Head Folding Mechanism Screws for GOTRAX GXL V2, Rival, XR Ultra & XR Elite – 10-Pack Replacement
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M5 x 12mm Black Wafer Head Cut-off Saw Screws for STIHL TS400 Cut-off Saw (replaces IS-M5x12 9022 341 0960) – 10-Pack Replacement
$5.99Choose size -
M5 x 12mm Black Wafer Head Generator Cover Screws for Honda EM, EB, EG Generators & EU3200i (replaces 90102-Z21-000) – 10-Pack Replacement
$5.99Choose size
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Devices whose records share a thread with Bicycle bottle cage boss, closest length match first.
- Berkel 330M Slicer carriage/guard fastener also M5 × 10 mm
- Car door trim panel also M5 × 10–16 mm
- Kick scooter clamp and folding hardware also M5 × 10–18 mm
- Six-bolt disc brake rotor also M5 × 10 mm
- Segway-Ninebot Max Pro 2.2 e-scooter stem also M5 × 12 mm
- SPD-SL / Look 3-hole cycling cleats also M5 × 10–18 mm
- Triumph Thruxton fairing side and bottom panels also M5 × 11 mm
- Bicycle water bottle cage bolts also M5 × 16 mm
Questions about Bicycle bottle cage boss screws
- What size screw does Bicycle bottle cage boss use?
- M5 × 10–18 mm for bottle cage to the down tube or seat tube.
- How long are the screws in Bicycle bottle cage boss?
- The records range from 10 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 boss?
- 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.