Bike rack & fender eyelets screw size
M5 · 12 to 20 mm long
Bike rack & fender eyelets takes M5 metric screws in lengths from 12 to 20 mm.
It is listed for frame and fork eyelets for racks and mudguards across brands.
This entry is marked confirmed and comes from bicycles.stackexchange.com.
For reference, M5 is 5 mm across the threads at 0.8 mm pitch. The imperial size people confuse it with: #10-32 (4.83 mm) — the other common rack thread; check before mixing.
Bike rack & fender eyelets 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 | 12–20 mm | 0.8 mm | not stated | not stated | frame and fork eyelets for racks and mudguards across brands | Confirmed |
Fitment records and sources
frame and fork eyelets for racks and mudguards across brands
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
How to check the screw before you buy
- Rack and enclosure hardware mixes metric and imperial (#8-32, #10-32, #6-32), so confirm the thread before forcing a screw.
- 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 12–20 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
- Espresso shower-screen screws vary in length across brands (10-16mm) even though thread is consistently M5, so cross-brand length compatibility is not guaranteed.
- Stacking frame + rack tab + fender stay needs 18-20mm bolts, not the 12-16mm that come with a cage.
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 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 Bike rack & fender eyelets, closest length match first.
- Leviton EV Series charging pedestal (EPED1 / EPED2) also M5 × 12–20 mm
- Alpha Series forklift mast bracket also M5 × 16 mm
- Rack-mount network and AV equipment also M5 × 19 mm
- Shelving brackets also M5 × 12–20 mm
- Rear-view / side mirror bracket also M5 × 12–16 mm
- Rack and fender eyelets also M5 × 12–16 mm
- RF Elements Twin Horn antenna bracket (secondary hardware) also M5 × 12 mm
- Badger Meter M5000 Remote Junction Box Kit also M5 × 16 mm
Questions about Bike rack & fender eyelets screws
- What size screw does Bike rack & fender eyelets use?
- M5 × 12–20 mm for frame and fork eyelets for racks and mudguards across brands.
- How long are the screws in Bike rack & fender eyelets?
- The records range from 12 to 20 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 Bike rack & fender eyelets?
- 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.