Shimano BL-M785 hydraulic brake lever screw size
M3 / M4 / M5 · 4.7 to 18 mm long
The screws used on Shimano BL-M785 hydraulic brake lever are M3, M4 and M5 in lengths from 4.7 to 18 mm.
There are 3 separate fitment records for it, including lever lid fixing bolts, "Lid Fixing Bolt (M3) 2 pcs." (M3), stroke/reach adjust screw, "Stroke Adjust Screw (M4 x 12) & Plate" (M4) and bleed screw listed as "Bleed Screw (M5 x 4.7) & O-Ring"; the same parts list also shows M5 (M5).
3 of the 3 records are marked confirmed, drawn from 1 source (usersmanualguide.com).
For reference, M3 is 3 mm across the threads at 0.5 mm pitch. The imperial size people confuse it with: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Shimano BL-M785 hydraulic brake lever 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 |
|---|---|---|---|---|---|---|
| M3 | not stated | 0.5 mm | not stated | not stated | Lever lid fixing bolts, "Lid Fixing Bolt (M3) 2 pcs." | Confirmed |
| M4 | 12 mm | 0.7 mm | not stated | not stated | Stroke/reach adjust screw, "Stroke Adjust Screw (M4 x 12) & Plate" | Confirmed |
| M5 | 4.7–18 mm | 0.8 mm | not stated | not stated | Bleed screw listed as "Bleed Screw (M5 x 4.7) & O-Ring"; the same parts list also shows M5 x 17.5 and M5 x 18 clamp/lever bolts | Confirmed |
Fitment records and sources
Lever lid fixing bolts, "Lid Fixing Bolt (M3) 2 pcs."
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
Stroke/reach adjust screw, "Stroke Adjust Screw (M4 x 12) & Plate"
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
Bleed screw listed as "Bleed Screw (M5 x 4.7) & O-Ring"; the same parts list also shows M5 x 17.5 and M5 x 18 clamp/lever bolts
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
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 M3 screw measures about 3 mm with calipers (usually a hair under). This device also uses M4 / M5, so measure each screw rather than assuming they match.
- Pitch: 0.5 mm from one thread crest to the next (20 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 4.7–18 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M3 heads take PH1 for Phillips and T10 for Torx, and a 2.5 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 M3 is about 80-130 N·cm into metal threads and 35-60 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M3 / M4 / M5
- Terminal-block clamp screws have manufacturer-specific torque values — over-tightening cracks the block or crushes the wire.
- Festo sensor brackets are named after the sensor interface (DASP-M4-...), but the bracket's own fixing screws are often a different size (M5/M6/M8).
- 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.
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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More in Vehicles, Marine & Mobility
The same screw also fits
Devices whose records share a thread with Shimano BL-M785 hydraulic brake lever, closest length match first.
- Mobility scooter battery box screw set also M5 × 10–16 mm
- Car centre console and vent trim also M4 × 12 mm
- RV / camper cabinet hardware also M4 × 12 mm
- Garden equipment control panels also M5 × 10–16 mm
- Triumph Thruxton harness cable covers also M5 × 12 mm
- Segway-Ninebot F/F2 Pro/P scooters Hex flat round head chassis screw also M5 × 10 mm
- Bosch e-bike battery mounting/guide bolts also M5 × 9–18 mm
- Trek E-Bike RIB Battery Mount also M5 × 16 mm
Questions about Shimano BL-M785 hydraulic brake lever screws
- What size screw does Shimano BL-M785 hydraulic brake lever use?
- M3 for lever lid fixing bolts, "Lid Fixing Bolt (M3) 2 pcs."; M4 × 12 mm for stroke/reach adjust screw, "Stroke Adjust Screw (M4 x 12) & Plate"; M5 × 4.7–18 mm for bleed screw listed as "Bleed Screw (M5 x 4.7) & O-Ring"; the same parts list also shows M5 x 17.5 and M5 x 18 clamp/lever bolts.
- How long are the screws in Shimano BL-M785 hydraulic brake lever?
- The records range from 4.7 to 18 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M3 screw?
- 0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.
- What screwdriver do I need for Shimano BL-M785 hydraulic brake lever?
- The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.
- Can I use an imperial screw instead of M3?
- No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.