POM APM-E Series II parking meter mechanism (single-space parking meter) screw size
M4 · 10 mm long
Our records put POM APM-E Series II parking meter mechanism (single-space parking meter) on M4 screws, 10 mm long.
The record covers APM-E Series II Mechanism Service Manual explicitly specifies M4 screws for securing the coin mechanism and electronics module inside the meter housing.
This entry is marked likely and comes from pom.com.
For reference, M4 is 4 mm across the threads at 0.7 mm pitch. The imperial size people confuse it with: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
POM APM-E Series II parking meter mechanism (single-space parking meter) 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 |
|---|---|---|---|---|---|---|
| M4 | 10 mm | 0.7 mm | not stated | not stated | APM-E Series II Mechanism Service Manual explicitly specifies M4 screws for securing the coin mechanism and electronics module inside the meter housing | Likely |
Fitment records and sources
APM-E Series II Mechanism Service Manual explicitly specifies M4 screws for securing the coin mechanism and electronics module inside the meter housing
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Rack and enclosure hardware mixes metric and imperial (#8-32, #10-32, #6-32), so confirm the thread before forcing a screw.
- Diameter: across the threads an M4 screw measures about 4 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.7 mm from one thread crest to the next (14.29 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 record states 10 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- Driver: the source does not name the drive. Standard M4 heads take PH2 for Phillips and T20 for Torx, and a 3 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 M4 is about 2.0-3.0 N·m into metal threads and 0.8-1.4 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M4
- There is no single standard Picatinny/rail screw size; makers use metric M3/M4 and imperial 6-48 or 8-40 interchangeably. Always measure the existing screw.
- 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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Questions about POM APM-E Series II parking meter mechanism (single-space parking meter) screws
- What size screw does POM APM-E Series II parking meter mechanism (single-space parking meter) use?
- M4 × 10 mm for APM-E Series II Mechanism Service Manual explicitly specifies M4 screws for securing the coin mechanism and electronics module inside the meter housing.
- How long are the screws in POM APM-E Series II parking meter mechanism (single-space parking meter)?
- The record gives 10 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- What is the thread pitch of an M4 screw?
- 0.7 mm (coarse), which is the standard pitch for M4 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 3.3 mm and the normal clearance hole is 4.5 mm.
- What screwdriver do I need for POM APM-E Series II parking meter mechanism (single-space parking meter)?
- The sources do not name the drive. For M4, Phillips heads normally take PH2 and Torx heads T20; socket heads take a 3 mm hex key.
- Can I use an imperial screw instead of M4?
- No. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same. Use a true M4 screw so it does not cross-thread or strip the hole.