Disc brake caliper post-mount adapters screw size
M5 · 12 to 20 mm long
Disc brake caliper post-mount adapters takes M5 metric screws in lengths from 12 to 20 mm.
The record covers caliper bolts on lighter road setups (some use M6).
This entry is marked reported.
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.
Disc brake caliper post-mount adapters 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 | caliper bolts on lighter road setups (some use M6) | Reported |
Fitment records and sources
caliper bolts on lighter road setups (some use M6)
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
How to check the screw before you buy
- If several screws hold the same part, check that they are all the same length before assuming they are.
- 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
- 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.
- 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.
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Devices whose records share a thread with Disc brake caliper post-mount adapters, closest length match first.
- Trek bottle cage bolts also M5 × 15–18 mm
- Flat-pack furniture also M5 × 20 mm
- Handlebar accessory clamps also M5 × 12–14 mm
- Eschmann LS5 / SES2555 autoclave also M5 × 20 mm
- Tama percussion / gong bass drum lug (part 7592) also M5 × 14 mm
- Wolf Tooth cage bolts also M5 × 16 mm
- Husqvarna chainsaw/brushcutter hardware also M5 × 12–16 mm
- TEKTELIC Kona Photon Gen-2 LoRaWAN gateway also M5 × 14–20 mm
Questions about Disc brake caliper post-mount adapters screws
- What size screw does Disc brake caliper post-mount adapters use?
- M5 × 12–20 mm for caliper bolts on lighter road setups (some use M6).
- How long are the screws in Disc brake caliper post-mount adapters?
- 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 Disc brake caliper post-mount adapters?
- 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.