LED downlight trim and driver screw size
M4 · 8 to 16 mm long
Our records put LED downlight trim and driver on M4 screws in lengths from 8 to 16 mm.
It is listed for trim ring and driver mounting.
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.
LED downlight trim and driver 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 | 8–16 mm | 0.7 mm | not stated | not stated | Trim ring and driver mounting | Reported |
Fitment records and sources
Trim ring and driver mounting
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- VESA holes are threaded inserts in the back cover; if a screw stops early, back it out rather than forcing it, because a bottomed-out screw can crack the panel housing.
- 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 8–16 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
- Dashcam mounts advertised as '1/4" M4 screw joint' have two different threads: the 1/4"-20 camera thread and a separate M4 grub screw for the ball joint — don't order the wrong one.
- Parts lists that say 'Taptite T-20 screw' are naming the driver, not the thread - only trust the separate M-size callout.
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 10mm Black Wafer Head Fender Clamp Base Screws for Minoura KODACHI DYK-1R Rear Fender – 8-Pack Replacement
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Devices whose records share a thread with LED downlight trim and driver, closest length match first.
- Monitor VESA 75x75 / 100x100 also M4 × 8–12 mm
- LG 50PZ950U also M4 × 12 mm
- Premier Mounts PBL-UMS/PBL-UMW Universal Projector Mount also M4 × 12 mm
- Bosch Smart System 1-arm handlebar support (shell and clamp mounting) also M4 × 12 mm
- Dell U4919DW also M4 × 10 mm
- Dell U2413 also M4 × 10 mm
- Raymarine Alpha Series Display Mast Bracket also M4 × 14 mm
- VESA MIS-D 75/100 display mount also M4 × 8–10 mm
Questions about LED downlight trim and driver screws
- What size screw does LED downlight trim and driver use?
- M4 × 8–16 mm for trim ring and driver mounting.
- How long are the screws in LED downlight trim and driver?
- The records range from 8 to 16 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 LED downlight trim and driver?
- 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.