Blue Robotics T200 Thruster (used on BlueROV2 and other ROVs) screw size
M3 · length not stated in the sources
If you are replacing a screw on Blue Robotics T200 Thruster (used on BlueROV2 and other ROVs), the thread is M3. None of the sources we found gives an exact length, so measure the original before you order.
The record covers blue Robotics community forum thread confirms 'there are four M3 threaded holes on the cowling of the thruster at 4 points on a 19 mm diameter circle' for mounting the thruster.
This entry is marked confirmed and comes from discuss.bluerobotics.com.
M3 means a 3 mm nominal diameter with a 0.5 mm thread pitch. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Blue Robotics T200 Thruster (used on BlueROV2 and other ROVs) 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 | Blue Robotics community forum thread confirms 'there are four M3 threaded holes on the cowling of the thruster at 4 points on a 19 mm diameter circle' for mounting the thruster | Confirmed |
Fitment records and sources
Blue Robotics community forum thread confirms 'there are four M3 threaded holes on the cowling of the thruster at 4 points on a 19 mm diameter circle' for mounting the thruster
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- Printer and CNC builds usually publish a bill of materials; when it lists a length, follow it, since extrusion T-nuts and motor faces have fixed thread depths.
- Diameter: across the threads an M3 screw measures about 3 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- 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.
- 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
- LED wall cabinets use different threads at different points - M3 on bezels, M4 on frame links and tops, M6 on frame joints. 'An M4 for the LED wall' is not enough information.
- Museum/AV projector mounting kits typically bundle four to six thread sizes (M3–M6) in one bag to fit varied projector OEM patterns — always match the specific length/thread pair actually used for a given projector model rather than assuming all sizes apply universally.
More in 3D Printing, CNC & Robotics
The same screw also fits
Devices whose records share a thread with Blue Robotics T200 Thruster (used on BlueROV2 and other ROVs), closest length match first.
- Prusa MINI frame and extruder also M3
- NEMA 17 stepper motor faceplate also M3
- OpenBuilds gantry plate brackets also M3
- VEX / Actobotics channel and gussets also M3
- MGN12 linear rail also M3
- 2020 extrusion T-nuts (light duty) also M3
- NEMA 17 stepper motor face also M3
- MGN9 linear rail also M3
Questions about Blue Robotics T200 Thruster (used on BlueROV2 and other ROVs) screws
- What size screw does Blue Robotics T200 Thruster (used on BlueROV2 and other ROVs) use?
- M3 for blue Robotics community forum thread confirms 'there are four M3 threaded holes on the cowling of the thruster at 4 points on a 19 mm diameter circle' for mounting the thruster.
- How long are the screws in Blue Robotics T200 Thruster (used on BlueROV2 and other ROVs)?
- None of the sources states a length. Remove one screw and measure it from under the head to the tip (overall for a countersunk head).
- 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 Blue Robotics T200 Thruster (used on BlueROV2 and other ROVs)?
- 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.