StarTech PROJWALLMNT universal projector wall mount screw size
M3 / M4 / M5 / M6 · 10 to 24 mm long
The screws used on StarTech PROJWALLMNT universal projector wall mount are M3, M4, M5 and M6 in lengths from 10 to 24 mm.
There are 4 separate fitment records for it, including M3 x 24 mm screws included in mounting hardware kit (M3), M4 x 24 mm screw option for attaching projector to mounting plate (M4) and M5 x 24 mm screw included for projector-to-plate mounting (M5), plus 1 more in the table below.
4 of the 4 records are marked confirmed, drawn from 1 source (sgcdn.startech.com).
For reference, M3 is 3 mm across the threads at 0.5 mm pitch. The imperial size people confuse it with: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
StarTech PROJWALLMNT universal projector wall 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 | 24 mm | 0.5 mm | not stated | not stated | M3 x 24 mm screws included in mounting hardware kit | Confirmed |
| M4 | 24 mm | 0.7 mm | not stated | not stated | M4 x 24 mm screw option for attaching projector to mounting plate | Confirmed |
| M5 | 24 mm | 0.8 mm | not stated | not stated | M5 x 24 mm screw included for projector-to-plate mounting | Confirmed |
| M6 | 10 mm | 1 mm | not stated | not stated | M6 x 8mm, M6 x 10mm, and M6 x 25mm hex screws used to attach the wall plate, arm, and mount base (plus M6 nylon-insert nuts)thread-locking patch | Confirmed |
Fitment records and sources
M3 x 24 mm screws included in mounting hardware kit
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
M4 x 24 mm screw option for attaching projector to mounting plate
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
M5 x 24 mm screw included for projector-to-plate mounting
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
M6 x 8mm, M6 x 10mm, and M6 x 25mm hex screws used to attach the wall plate, arm, and mount base (plus M6 nylon-insert nuts)
pitch 1 mm · tap 5 mm · clearance 6.6 mm · PH3 / Torx T30
How to check the screw before you buy
- For a wall or arm mount, the screw has to engage the threaded insert by several turns but must not bottom out, so measure the insert depth and add the thickness of the bracket and any spacers.
- Diameter: across the threads an M3 screw measures about 3 mm with calipers (usually a hair under). This device also uses M4 / M5 / M6, so measure each screw rather than assuming they match.
- 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: measure from under the head to the tip for pan, button, wafer and cap heads; countersunk (flat) heads are measured overall.
- The records span 10–24 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 / M4 / M5 / M6
- 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.
- 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.
- Concept2 rowers/ergs look metric-friendly but use imperial 1/4-20 hardware throughout — M6 will NOT thread in; do not force it.
- The same StarTech universal projector mount ships with M3, M4, M5, and M6 screw sets simultaneously so the installer can pick whichever matches the projector's own threaded inserts — metric size is projector-dependent, not mount-dependent.
More in Displays, TVs & Mounts
The same screw also fits
Devices whose records share a thread with StarTech PROJWALLMNT universal projector wall mount, closest length match first.
- VESA 200x200 and larger (MIS-E/F) also M6 × 10 mm
- QualGear QG-KIT-VA-3IN-B Projector Mounting Kit also M6 × 10 mm
- Sony Bravia mid-size TVs also M6 × 10 mm
- LG TVs 43-55in also M6 × 10 mm
- LED video wall cabinet, frame-to-frame (SCREW A) also M6 × 10 mm
- VESA FDMI Part F large-format interface also M6 × 10 mm
- Hillrom/Baxter hospital bed hardware also M6 × 10 mm
- Atdec Telehook TH-2250-VF display wall mount also M4 × 24 mm
Questions about StarTech PROJWALLMNT universal projector wall mount screws
- What size screw does StarTech PROJWALLMNT universal projector wall mount use?
- M3 × 24 mm for M3 x 24 mm screws included in mounting hardware kit; M4 × 24 mm for M4 x 24 mm screw option for attaching projector to mounting plate; M5 × 24 mm for M5 x 24 mm screw included for projector-to-plate mounting; M6 × 10 mm for M6 x 8mm, M6 x 10mm, and M6 x 25mm hex screws used to attach the wall plate, arm, and mount base (plus M6 nylon-insert nuts).
- How long are the screws in StarTech PROJWALLMNT universal projector wall mount?
- The records range from 10 to 24 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 StarTech PROJWALLMNT universal projector wall 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.