CMM ball styli (M2 stem) screw size
M2 · length not stated in the sources
The screws used on CMM ball styli (M2 stem) are M2. None of the sources we found gives an exact length, so measure the original before you order.
Where it is used: product line explicitly named 'M2 Styli' with 1mm-2.5mm ball diameters and M2 stem thread.
This entry is marked confirmed and comes from cmmtechnology.com.
An M2 screw is 2 mm in diameter with a 0.4 mm pitch, tapped with a 1.6 mm drill; imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable.
CMM ball styli (M2 stem) 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 |
|---|---|---|---|---|---|---|
| M2 | not stated | 0.4 mm | not stated | not stated | Product line explicitly named 'M2 Styli' with 1mm-2.5mm ball diameters and M2 stem thread | Confirmed |
Fitment records and sources
Product line explicitly named 'M2 Styli' with 1mm-2.5mm ball diameters and M2 stem thread
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
How to check the screw before you buy
- Take one original screw out first and measure it before ordering; the record above tells you the thread, the original screw tells you the exact length and head.
- Diameter: across the threads an M2 screw measures about 2 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.4 mm from one thread crest to the next (25 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 M2 heads take PH0 for Phillips and T6 for Torx, and a 1.5 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 M2 is about 25-40 N·cm into metal threads and 12-20 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2
- 'M2' is used loosely by modders for anything in the 1.6-2.5mm range. Measure with calipers before buying.
- 'M2' is sometimes used loosely by resellers to mean 'roughly 2mm' without a real ISO metric thread; only counted here when the source datasheet explicitly states 'M2' thread.
More in Other Equipment
The same screw also fits
Devices whose records share a thread with CMM ball styli (M2 stem), closest length match first.
- TFV12 rebuildable vape tank grub/set screws also M2
- M.2 heatsink / shield assemblies also M2
- Raspberry Pi 5 board mounting holes also M2
- Raspberry Pi HATs & cases also M2
- DJI Flame Wheel F450 / F550 also M2
- Xbox wireless controllers also M2
- Mignon index typewriter actuator arm (Zamac casting repair) also M2
- Nintendo Switch battery shield also M2
Questions about CMM ball styli (M2 stem) screws
- What size screw does CMM ball styli (M2 stem) use?
- M2 for product line explicitly named 'M2 Styli' with 1mm-2.5mm ball diameters and M2 stem thread.
- How long are the screws in CMM ball styli (M2 stem)?
- 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 M2 screw?
- 0.4 mm (coarse), which is the standard pitch for M2 machine screws; a 0.25 mm fine pitch exists but is uncommon. The tap drill is 1.6 mm and the normal clearance hole is 2.4 mm.
- What screwdriver do I need for CMM ball styli (M2 stem)?
- The sources do not name the drive. For M2, Phillips heads normally take PH0 and Torx heads T6; socket heads take a 1.5 mm hex key.
- Can I use an imperial screw instead of M2?
- No. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable. Use a true M2 screw so it does not cross-thread or strip the hole.