How long are the screws in Bicycle bottle cage bosses (Trek and industry standard)?

The records range from 10 to 15 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 bosses (Trek and industry standard)?

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.

Bicycle bottle cage bosses (Trek and industry standard) screw size

M5 · 10 to 15 mm long

If you are replacing a screw on Bicycle bottle cage bosses (Trek and industry standard), the thread is M5 in lengths from 10 to 15 mm.

Where it is used: hex socket bolts into frame braze-ons; same thread used for racks, fenders and accessory mounts.

Head and drive, as the source states them: Hex socket (Allen) drive.

This entry is marked confirmed and comes from trekbikes.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.

Bicycle bottle cage bosses (Trek and industry standard) 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	10–15 mm	0.8 mm	not stated	Hex socket (Allen)	Hex socket bolts into frame braze-ons; same thread used for racks, fenders and accessory mounts	Confirmed

Fitment records and sources

M5typically 10-15mmconfirmed

Hex socket bolts into frame braze-ons; same thread used for racks, fenders and accessory mounts

pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25

Source

How to check the screw before you buy

Board standoffs and enclosure bosses set the usable length: the screw should clamp the board without bottoming in the standoff.
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 10–15 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

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.
Carbon bosses strip easily: 2-4 Nm torque and the right length so the bolt doesn't bottom out.

Pitch gauge · Screw size finder · Torque guide

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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The same screw also fits

Devices whose records share a thread with Bicycle bottle cage bosses (Trek and industry standard), closest length match first.

EcoFlow Power Kits Power Hub wall/RV mounting hardware also M5 × 10–15 mm
E-scooter fenders & kickstands also M5 × 10–15 mm
Wheelchair armrest and footrest brackets also M5 × 12–15 mm
cab Applicator A3200 print-and-apply labeling system (packaging line hardware) also M5 × 12 mm
FJD 3D Excavator Guidance System (GNSS/IMU hardware) also M5 × 12 mm
Hach SC4500 universal controller also M5 × 15 mm
Electrolux Professional compact rack-type dishwasher also M5 × 10 mm
Rowing machine rail brackets also M5 × 15 mm

Questions about Bicycle bottle cage bosses (Trek and industry standard) screws

What size screw does Bicycle bottle cage bosses (Trek and industry standard) use?: M5 × 10–15 mm for hex socket bolts into frame braze-ons; same thread used for racks, fenders and accessory mounts.
How long are the screws in Bicycle bottle cage bosses (Trek and industry standard)?: The records range from 10 to 15 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 bosses (Trek and industry standard)?: 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.

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