NEC P474W / P474U / P554W / P554U projector screw size
M4 · 8 mm long
The screws used on NEC P474W / P474U / P554W / P554U projector are M4, 8 mm long.
It is listed for four M4x8mm ceiling-mount attachment screws.
This entry is marked confirmed and comes from audiogeneral.com.
For reference, M4 is 4 mm across the threads at 0.7 mm pitch. The imperial size people confuse it with: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
NEC P474W / P474U / P554W / P554U projector 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 mm | 0.7 mm | not stated | not stated | Four M4x8mm ceiling-mount attachment screws | Confirmed |
Fitment records and sources
Four M4x8mm ceiling-mount attachment screws
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
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 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 record states 8 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 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
- 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.
- 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.
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Devices whose records share a thread with NEC P474W / P474U / P554W / P554U projector, closest length match first.
- LG 55LM7600 also M4 × 8 mm
- GCX 75/100mm VESA flush display mount also M4 × 8 mm
- Elo self-service stand (E796965 / E797162) also M4 × 8 mm
- Philips IntelliVue MP80/MP90 monitor also M4 × 8 mm
- LED video wall cabinet top screw F and side screw D also M4 × 8 mm
- VESA MIS-E display mount also M4 × 8 mm
- Samsung monitors & smaller TVs also M4 × 8 mm
- LG 42LM6700 also M4 × 8 mm
Questions about NEC P474W / P474U / P554W / P554U projector screws
- What size screw does NEC P474W / P474U / P554W / P554U projector use?
- M4 × 8 mm for four M4x8mm ceiling-mount attachment screws.
- How long are the screws in NEC P474W / P474U / P554W / P554U projector?
- The record gives 8 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- 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 NEC P474W / P474U / P554W / P554U projector?
- 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.