StarTech Universal Projector Wall Mount (PROJWALLMNT) screw size
M3 / M4 / M5 / M6 · 8 to 25 mm long
If you are replacing a screw on StarTech Universal Projector Wall Mount (PROJWALLMNT), the thread is M3, M4, M5 and M6 in lengths from 8 to 25 mm.
There are 4 separate fitment records for it, including included hardware kit lists M3 x 24mm screws for attaching the projector plate to smaller (M3), kit includes M4 x 24mm screws for mid-size projector mounting hole patterns (M4) and kit includes M5 x 24mm screws for larger projector mounting bosses (M5), plus 1 more in the table below.
4 of the 4 records are marked confirmed, drawn from 1 source (sgcdn.startech.com).
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.
StarTech Universal Projector Wall Mount (PROJWALLMNT) 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 | Included hardware kit lists M3 x 24mm screws for attaching the projector plate to smaller projectors | Confirmed |
| M4 | 24 mm | 0.7 mm | not stated | not stated | Kit includes M4 x 24mm screws for mid-size projector mounting hole patterns | Confirmed |
| M5 | 24 mm | 0.8 mm | not stated | not stated | Kit includes M5 x 24mm screws for larger projector mounting bosses | Confirmed |
| M6 | 8–25 mm | 1 mm | not stated | not stated | Wall-plate/arm hardware includes M6 x 8/10/24/25mm screws for structural mounting | Confirmed |
Fitment records and sources
Included hardware kit lists M3 x 24mm screws for attaching the projector plate to smaller projectors
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
Kit includes M4 x 24mm screws for mid-size projector mounting hole patterns
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
Kit includes M5 x 24mm screws for larger projector mounting bosses
pitch 0.8 mm · tap 4.2 mm · clearance 5.5 mm · PH2 / Torx T25
Wall-plate/arm hardware includes M6 x 8/10/24/25mm screws for structural mounting
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 8–25 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard 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
- Museum/AV projector mounting kits typically bundle four to six thread sizes (M3–M6) in one bag to fit varied projector OEM patterns — always match the specific length/thread pair actually used for a given projector model rather than assuming all sizes apply universally.
- 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.
- Archery sight and rest hardware is almost always imperial 10-24, not metric.
- 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.
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.
More in Displays, TVs & Mounts
The same screw also fits
Devices whose records share a thread with StarTech Universal Projector Wall Mount (PROJWALLMNT), closest length match first.
- ASUS VG27AQ1A also M6 × 16.2 mm
- VESA MIS-F large display mount also M6 × 10–20 mm
- Raymarine Axiom 7/9/12 multifunction display also M5 × 24 mm
- Pro-AV truss clamps also M6 × 16–25 mm
- 27-34in ultrawide monitors also M6 × 12–16 mm
- Signage standoffs also M6 × 20–25 mm
- Hillrom/Baxter hospital bed hardware also M6 × 10 mm
- Dell U4320Q also M6 × 12 mm
Questions about StarTech Universal Projector Wall Mount (PROJWALLMNT) screws
- What size screw does StarTech Universal Projector Wall Mount (PROJWALLMNT) use?
- M3 × 24 mm for included hardware kit lists M3 x 24mm screws for attaching the projector plate to smaller projectors; M4 × 24 mm for kit includes M4 x 24mm screws for mid-size projector mounting hole patterns; M5 × 24 mm for kit includes M5 x 24mm screws for larger projector mounting bosses; M6 × 8–25 mm for wall-plate/arm hardware includes M6 x 8/10/24/25mm screws for structural mounting.
- How long are the screws in StarTech Universal Projector Wall Mount (PROJWALLMNT)?
- The records range from 8 to 25 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 Universal Projector Wall Mount (PROJWALLMNT)?
- 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.