How long are the screws in Motorcycle brake disc rotor bolts?

The records range from 15 to 20 mm depending on the position, so match each screw to its own hole.

What is the thread pitch of an M6 screw?

1 mm (coarse), which is the standard pitch for M6 machine screws; a 0.75 mm fine pitch exists but is uncommon. The tap drill is 5 mm and the normal clearance hole is 6.6 mm.

What screwdriver do I need for Motorcycle brake disc rotor bolts?

The sources do not name the drive. For M6, Phillips heads normally take PH3 and Torx heads T30; socket heads take a 5 mm hex key.

Can I use an imperial screw instead of M6?

No. Imperial look-alike: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6. Use a true M6 screw so it does not cross-thread or strip the hole.

Motorcycle brake disc rotor bolts screw size

M6 · 15 to 20 mm long

The screws used on Motorcycle brake disc rotor bolts are M6 in lengths from 15 to 20 mm.

Where it is used: pro-Bolt and Racebolt sell stainless disc rotor bolts explicitly specified as M6x(1.00mm) pitch for Yamaha/Honda fitments.

This entry is marked confirmed and comes from probolt-eu.com.

For reference, M6 is 6 mm across the threads at 1 mm pitch. The imperial size people confuse it with: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6.

Motorcycle brake disc rotor bolts 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
M6	15–20 mm	1 mm	not stated	not stated	Pro-Bolt and Racebolt sell stainless disc rotor bolts explicitly specified as M6x(1.00mm) pitch for Yamaha/Honda fitmentsstainless	Confirmed

Fitment records and sources

M615mm, 20mmconfirmed

Pro-Bolt and Racebolt sell stainless disc rotor bolts explicitly specified as M6x(1.00mm) pitch for Yamaha/Honda fitments

pitch 1 mm · tap 5 mm · clearance 6.6 mm · PH3 / Torx T30

Source

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 M6 screw measures about 6 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
Pitch: 1 mm from one thread crest to the next (10 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 15–20 mm, which means different positions take different lengths — match each hole to its own screw.
Driver: the source does not name the drive. Standard M6 heads take PH3 for Phillips and T30 for Torx, and a 5 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 M6 is about 7-10 N·m into metal threads and 2.5-4.0 N·m into plastic bosses; snug it up and stop.

Common mix-ups with M6

UR cobot flange bolts are commonly sold/quoted as 'M6 bolts' but the required length depends on the tool thickness; UR's own guidance is bolt class M6-8.8 to ISO4762 without a fixed length, so length must be selected per adapter/tool stack-up, not assumed as a fixed mm value.
Climbing bolt hangers and most ski bindings are M8 and up, outside this database's M1.2-M6 range.

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 Motorcycle brake disc rotor bolts, closest length match first.

Ducati Monster 1100 Evo also M6 × 18 mm
Gas grill control panel also M6 × 15–20 mm
Table / mitre saw fence and rails also M6 × 20 mm
Car dashboard and cluster bezel also M6 × 15–20 mm
Adult e-scooters also M6 × 20 mm
Lekkie 5mm motor spacer for Bafang BBSHD/BBS02 also M6 × 16 mm
Shimano BR-M6100 disc brake caliper also M6 × 18 mm
Gas grill cart and legs also M6 × 20 mm

Questions about Motorcycle brake disc rotor bolts screws

What size screw does Motorcycle brake disc rotor bolts use?: M6 × 15–20 mm for pro-Bolt and Racebolt sell stainless disc rotor bolts explicitly specified as M6x(1.00mm) pitch for Yamaha/Honda fitments.
How long are the screws in Motorcycle brake disc rotor bolts?: The records range from 15 to 20 mm depending on the position, so match each screw to its own hole.
What is the thread pitch of an M6 screw?: 1 mm (coarse), which is the standard pitch for M6 machine screws; a 0.75 mm fine pitch exists but is uncommon. The tap drill is 5 mm and the normal clearance hole is 6.6 mm.
What screwdriver do I need for Motorcycle brake disc rotor bolts?: The sources do not name the drive. For M6, Phillips heads normally take PH3 and Torx heads T30; socket heads take a 5 mm hex key.
Can I use an imperial screw instead of M6?: No. Imperial look-alike: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6. Use a true M6 screw so it does not cross-thread or strip the hole.

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