Ubiquiti UniFi AP-AC-PRO access point screw size
M3 · 50 mm long
If you are replacing a screw on Ubiquiti UniFi AP-AC-PRO access point, the thread is M3, 50 mm long.
Where it is used: official Quick Start Guide package contents list M3x50 flat head mounting screws (Qty 4) and M3 keps nuts (Qty 4).
Head and drive, as the source states them: flat / countersunk head.
This entry is marked confirmed and comes from ubnt.su.
M3 means a 3 mm nominal diameter with a 0.5 mm thread pitch. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Ubiquiti UniFi AP-AC-PRO access point 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 | 50 mm | 0.5 mm | Flat / countersunk | not stated | Official Quick Start Guide package contents list M3x50 flat head mounting screws (Qty 4) and M3 keps nuts (Qty 4) | Confirmed |
Fitment records and sources
Official Quick Start Guide package contents list M3x50 flat head mounting screws (Qty 4) and M3 keps nuts (Qty 4)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- Board standoffs and enclosure bosses set the usable length: the screw should clamp the board without bottoming in the standoff.
- 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 record states 50 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 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
- Power-tool gearcase and clamshell screws are usually thread-forming (marked "ST") even when the parts list gives an M-size — a normal machine screw of the same size may not hold in the plastic boss.
- GoPro's own official Dive Housing user guide does not itself state a metric screw size for the housing body; only third-party accessory manufacturer (INON) manuals explicitly cite M6 screws for their add-on arms/adapters attaching to the housing.
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Devices whose records share a thread with Ubiquiti UniFi AP-AC-PRO access point, closest length match first.
- Ubiquiti UniFi AP ceiling mount also M3 × 50 mm
- Ubiquiti UniFi UAP / UAP-LR access point also M3 × 50 mm
- Ubiquiti UniFi UAP-AC access point also M3 × 50 mm
- Ubiquiti UniFi AP / UAP-LR ceiling & wall mount kit also M3 × 50 mm
- Wurth Elektronik WA-SSTIE steel spacer stud also M3 × 50 mm
- Wurth Elektronik WA-SPAIE plastic spacer stud also M3 × 50 mm
- Ubiquiti UniFi AP-AC-LITE access point also M3 × 50 mm
- Ubiquiti UniFi AP-PRO access point also M3 × 50 mm
Questions about Ubiquiti UniFi AP-AC-PRO access point screws
- What size screw does Ubiquiti UniFi AP-AC-PRO access point use?
- M3 × 50 mm for official Quick Start Guide package contents list M3x50 flat head mounting screws (Qty 4) and M3 keps nuts (Qty 4).
- How long are the screws in Ubiquiti UniFi AP-AC-PRO access point?
- The record gives 50 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- 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-AC-PRO access point?
- 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.