Thermostat and wall control backplates screw size
M4 · 20 to 25 mm long
The screws used on Thermostat and wall control backplates are M4 in lengths from 20 to 25 mm.
It is listed for wall plate mounting for thermostats and controls.
This entry is marked reported.
An M4 screw is 4 mm in diameter with a 0.7 mm pitch, tapped with a 3.3 mm drill; imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Thermostat and wall control backplates 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 | 20–25 mm | 0.7 mm | not stated | not stated | Wall plate mounting for thermostats and controls | Reported |
Fitment records and sources
Wall plate mounting for thermostats and controls
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Appliance panels often use self-tapping screws into sheet metal or plastic, and machine screws into nuts or inserts — keep each type where it came from.
- 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 records span 20–25 mm, which means different positions take different lengths — match each hole to its own screw.
- 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
- Most HVAC chassis hardware in US-market units is imperial; metric shows up mainly on European-made components.
- Display mounts mix systems: the screen side is metric M4/M6, but the wall side of many mounts uses imperial wood screws such as #14 x 2.5in.
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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M4 x 25mm Black Wafer Head Assembly Screws for xTool D1 Pro Laser Engraver – 10-Pack Replacement
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Devices whose records share a thread with Thermostat and wall control backplates, closest length match first.
- Espresso machine group head also M4 × 20 mm
- Dyson vacuum motor housing also M4 × 20 mm
- Ipso commercial washer (Alliance Laundry Systems OEM part) also M4 × 25 mm
- HVAC register and diffuser faceplates also M4 × 20 mm
- Daikin FTXS/CTXS Mini-split indoor unit terminal cover / mounting plate screw also M4 × 25 mm
- Escalator drive station / chain guide / contact mat / illumination hex cap screw also M4 × 20 mm
- Nerf blaster thumbscrews (large) also M4 × 20–25 mm
- Makeblock mBot Neo/mBot2 assembly kit also M4 × 20–25 mm
Questions about Thermostat and wall control backplates screws
- What size screw does Thermostat and wall control backplates use?
- M4 × 20–25 mm for wall plate mounting for thermostats and controls.
- How long are the screws in Thermostat and wall control backplates?
- The records range from 20 to 25 mm depending on the position, so match each screw to its own hole.
- 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 Thermostat and wall control backplates?
- 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.