ATC (Advanced Transportation Controller) traffic signal cabinet standard screw size
M4 · 10 mm long
If you are replacing a screw on ATC (Advanced Transportation Controller) traffic signal cabinet standard, the thread is M4, 10 mm long.
It is listed for city of Suffolk ATC Traffic Signal Controller Cabinet standard specification explicitly calls for M4 fasteners on the load switch and terminal facility mounting panels within the cabinet.
This entry is marked likely and comes from suffolkva.us.
M4 means a 4 mm nominal diameter with a 0.7 mm thread pitch. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
ATC (Advanced Transportation Controller) traffic signal cabinet standard 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 | City of Suffolk ATC Traffic Signal Controller Cabinet standard specification explicitly calls for M4 fasteners on the load switch and terminal facility mounting panels within the cabinet | Likely |
Fitment records and sources
City of Suffolk ATC Traffic Signal Controller Cabinet standard specification explicitly calls for M4 fasteners on the load switch and terminal facility mounting panels within the cabinet
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Camera and optics hardware often uses short screws into thin threaded plates, so check engagement before tightening fully.
- 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
- Some rackmount KVM switch kits pair M4x10 bracket-to-rack screws with M3.2x4.5 bracket-to-chassis screws (non-standard M3.2, not a true M3), so kits are not fully interchangeable with generic M3/M4 hardware.
- JCM bill-acceptor manual warns that if the host cabinet mounting bracket is only 2mm thick, standard-length M4 screws will not seat correctly — screw length must be matched to bracket thickness.
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.
More in Cameras & Optics
The same screw also fits
Devices whose records share a thread with ATC (Advanced Transportation Controller) traffic signal cabinet standard, closest length match first.
- Underwater camera housing latch and port also M4 × 10 mm
- Tilta TA-RF-LPL adapter ring support (RED KOMODO cage) also M4 × 10 mm
- Wooden Camera UMB-1 Universal Mattebox (Base/Clamp On/Swing Away/Pro) also M4 × 10 mm
- Riflescope ring cap also M4 × 10 mm
- Celestron collimation screws, C8/C9.25/C11 SCT optical tubes also M4 × 10 mm
- DJI RS 5 / RS 4 / RS 3 / RSC 2 gimbal camera mount also M4 × 10 mm
- DJI RS series gimbals (RS 5, RS4 Pro, RS4, RS3 Mini/Pro/3, RS2, RSC2) also M4 × 10 mm
- Telescope finder-scope shoe / base (TS-Optics) also M4 × 10 mm
Questions about ATC (Advanced Transportation Controller) traffic signal cabinet standard screws
- What size screw does ATC (Advanced Transportation Controller) traffic signal cabinet standard use?
- M4 × 10 mm for city of Suffolk ATC Traffic Signal Controller Cabinet standard specification explicitly calls for M4 fasteners on the load switch and terminal facility mounting panels within the cabinet.
- How long are the screws in ATC (Advanced Transportation Controller) traffic signal cabinet standard?
- 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 ATC (Advanced Transportation Controller) traffic signal cabinet standard?
- 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.