Star Micronics mPOP under-counter mount (CM-POP1) screw size
M3 / M4 · 8 to 12 mm long
If you are replacing a screw on Star Micronics mPOP under-counter mount (CM-POP1), the thread is M3 and M4 in lengths from 8 to 12 mm.
There are 2 separate fitment records for it, including small screws attaching mount frame to mPOP unit (M3) and large screws securing frame under counter (M4).
2 of the 2 records are marked confirmed, drawn from 1 source (starasia.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.
Star Micronics mPOP under-counter mount (CM-POP1) 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 | 8 mm | 0.5 mm | not stated | not stated | small screws attaching mount frame to mPOP unit | Confirmed |
| M4 | 12 mm | 0.7 mm | not stated | not stated | large screws securing frame under counter | Confirmed |
Fitment records and sources
small screws attaching mount frame to mPOP unit
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
large screws securing frame under counter
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
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 M3 screw measures about 3 mm with calipers (usually a hair under). This device also uses M4, 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 8–12 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
- GoPro's own official Dive Housing user guide does not itself state a metric screw size for the housing body; only third-party accessory manufacturer (INON) manuals explicitly cite M6 screws for their add-on arms/adapters attaching to the housing.
- Sonos speakers mix lengths within one unit — M3 for driver housings, M2.5 at the control panel. Keep them sorted during teardown.
- M4 and 6-32 UNC share a nominal diameter with different pitch — a classic cross-thread in US-market kits.
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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M3 x 8mm Phillips Wafer Head Screw for SLA Resin 3D Printer VAT Film - Single Replacement Black
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M3 x 8mm Phillips Flat Head Countersunk Machine Screws Zinc Silver 100-Pack for RC & 3D Printers
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M3 x 8mm Phillips Flat Head Countersunk Machine Screws Zinc Silver 10-Pack for RC & 3D Printers
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M4 x 12mm Black Wafer Head Chainsaw & Cut-off Saw Screws for STIHL MS 460, MS 362, TS480i & TS500i (IS-M4x12) – 10-Pack Replacement
$5.49Choose size -
M4 x 12mm Black Wafer Head Monitor VESA, Neck & Stand Screws for Dell UltraSharp U4320Q & Sceptre Monitors – 8-Pack Replacement
$5.49Choose size
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Devices whose records share a thread with Star Micronics mPOP under-counter mount (CM-POP1), closest length match first.
- Pumpkin SUPERNOVA 6U CubeSat Structure Kit also M3 × 8 mm
- TEKTELIC Kona Photon Gen-2 LoRaWAN gateway also M4 × 12 mm
- Hotends & heat breaks (E3D and clones) also M3 × 8 mm
- Solar module frame grounding lug also M4 × 12 mm
- Third-party Raspberry Pi cases & HAT stacks also M3 × 8 mm
- Backscatter FLIP3.1 underwater filter frame screws (2x) also M3 × 8 mm
- Floyd Rose locking tremolo saddles also M3 × 8 mm
- Cabinet & furniture hardware also M4 × 12 mm
Questions about Star Micronics mPOP under-counter mount (CM-POP1) screws
- What size screw does Star Micronics mPOP under-counter mount (CM-POP1) use?
- M3 × 8 mm for small screws attaching mount frame to mPOP unit; M4 × 12 mm for large screws securing frame under counter.
- How long are the screws in Star Micronics mPOP under-counter mount (CM-POP1)?
- The records range from 8 to 12 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 Star Micronics mPOP under-counter mount (CM-POP1)?
- 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.
- Where can I buy replacement screws for Star Micronics mPOP under-counter mount (CM-POP1)?
- TechSpareWarehouse (our own store) lists M3 x 8mm, which matches the length in the records above.