Ubiquiti UniFi AP ceiling mount screw size
M3 · 20 to 50 mm long
Ubiquiti UniFi AP ceiling mount takes M3 metric screws in lengths from 20 to 50 mm.
The record covers three M3 x 50 flat head screws with M3 Keps nuts and M3 x 20 anchors for the ceiling backing plate.
Head and drive, as the source states them: flat / countersunk head.
This entry is marked confirmed and comes from dl.ubnt.com.
An M3 screw is 3 mm in diameter with a 0.5 mm pitch, tapped with a 2.5 mm drill; imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Ubiquiti UniFi AP ceiling mount 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 | 20–50 mm | 0.5 mm | Flat / countersunk | not stated | Three M3 x 50 flat head screws with M3 Keps nuts and M3 x 20 anchors for the ceiling backing plate | Confirmed |
Fitment records and sources
Three M3 x 50 flat head screws with M3 Keps nuts and M3 x 20 anchors for the ceiling backing plate
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
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 M3 screw measures about 3 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- 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: the source describes a countersunk (flat) head, and those are measured overall, from the top of the head to the tip.
- The records span 20–50 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
- 2020 extrusion T-nuts come in M3/M4/M5 and are not interchangeable — M3 is accessory-only, M5 is structural.
- M3 (3.0mm, 0.5mm pitch) is not #6-32 UNC (~3.5mm) — they look identical and cross-thread, the single most common PC-building mistake.
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Devices whose records share a thread with Ubiquiti UniFi AP ceiling mount, closest length match first.
- Ubiquiti UniFi AP-AC-PRO access point also M3 × 50 mm
- Keystone metric hex PCB standoff also M3 × 20–25 mm
- Ubiquiti UniFi UAP / UAP-LR access point also M3 × 50 mm
- cab Applicator A3200 print-and-apply labeling system (packaging line hardware) also M3 × 20–25 mm
- Molex Secured Wall Mount Fiber Enclosure (DSC/QLC UNLDD) also M3 × 35 mm
- Ubiquiti UniFi UAP-AC access point also M3 × 50 mm
- Ubiquiti UniFi AP / UAP-LR ceiling & wall mount kit also M3 × 50 mm
- Keystone aluminum hex standoff (P/N 24438) also M3 × 25 mm
Questions about Ubiquiti UniFi AP ceiling mount screws
- What size screw does Ubiquiti UniFi AP ceiling mount use?
- M3 × 20–50 mm for three M3 x 50 flat head screws with M3 Keps nuts and M3 x 20 anchors for the ceiling backing plate.
- How long are the screws in Ubiquiti UniFi AP ceiling mount?
- The records range from 20 to 50 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 Ubiquiti UniFi AP ceiling mount?
- 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.