Carbon frame bottle bosses screw size
M5 · 12 to 16 mm long
Our records put Carbon frame bottle bosses on M5 screws in lengths from 12 to 16 mm.
The record covers M5 with strict 2-4 Nm torque limits to avoid cracking.
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.
Carbon frame bottle bosses screw specifications
One row per fitment record. Head, drive and torque are shown only where the source states them; pitch is the ISO coarse pitch for the thread.
| Thread | Length | Pitch | Head | Drive | Torque | Where it goes | Status |
|---|---|---|---|---|---|---|---|
| M5 | 12–16 mm | 0.8 mm | not stated | not stated | 2-4 Nm | M5 with strict 2-4 Nm torque limits to avoid cracking | Confirmed |
Fitment records and sources
M5 with strict 2-4 Nm torque limits to avoid cracking
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 12–16 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.
Common mix-ups with M5
- Carbon bosses strip easily: 2-4 Nm torque and the right length so the bolt doesn't bottom out.
- M5x0.8 is the de facto universal bike thread — confirm 0.8mm pitch before threading into carbon or alloy bosses.
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 Generator Cover Screws for Honda EM, EB, EG Generators & EU3200i (replaces 90102-Z21-000) – 10-Pack Replacement
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Devices whose records share a thread with Carbon frame bottle bosses, closest length match first.
- Rittal SZ enclosure profile mounting screw also M5 × 12 mm
- Rittal 7094130 assembly screw also M5 × 16 mm
- 19-inch rack cage nut (mid size) also M5 × 12–16 mm
- Triumph auxiliary power socket / instrument panel bracket also M5 × 16 mm
- QSC K8 loudspeaker yoke bracket also M5 × 16 mm
- Marine swivel mount brackets also M5 × 12–16 mm
- Hospital bed siderail and actuator brackets also M5 × 12–16 mm
- Tent frame hub connectors also M5 × 12–16 mm
Questions about Carbon frame bottle bosses screws
- What size screw does Carbon frame bottle bosses use?
- M5 × 12–16 mm for M5 with strict 2-4 Nm torque limits to avoid cracking.
- How long are the screws in Carbon frame bottle bosses?
- The records range from 12 to 16 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 Carbon frame bottle bosses?
- 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.
- How tight should the M5 screw on Carbon frame bottle bosses be?
- The source gives 2-4 Nm for M5 with strict 2-4 Nm torque limits to avoid cracking.