Dell Alienware 17 R4 screw size
M2.5 · 13 mm long
Dell Alienware 17 R4 takes M2.5 metric screws, 13 mm long.
Where it is used: base cover Phillips screws (rear six).
Head and drive, as the source states them: Phillips drive.
This entry is marked confirmed and comes from ifixit.com.
An M2.5 screw is 2.5 mm in diameter with a 0.45 mm pitch, tapped with a 2.05 mm drill; imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in.
Dell Alienware 17 R4 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 |
|---|---|---|---|---|---|---|
| M2.5 | 13 mm | 0.45 mm | not stated | Phillips | base cover Phillips screws (rear six) | Confirmed |
Fitment records and sources
base cover Phillips screws (rear six)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
How to check the screw before you buy
- If several screws hold the same part, check that they are all the same length before assuming they are.
- Diameter: across the threads an M2.5 screw measures about 2.5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.45 mm from one thread crest to the next (22.22 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 13 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- Driver: the source names a Phillips drive. For comparison, standard M2.5 heads take PH1 (Phillips) or T8 (Torx), or a 2 mm hex key.
- Tightening: no device-specific torque is published in these records. The site's general figure for M2.5 is about 45-70 N·cm into metal threads and 20-35 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2.5
- Dell/HP/Lenovo manuals often list screws only by torque or head shape, so community teardowns are needed for diameter.
- M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.
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Devices whose records share a thread with Dell Alienware 17 R4, closest length match first.
- Raspberry Pi 3B / 4B / 5 / Zero 2 standoff kits also M2.5 × 13 mm
- Motorola APX 5000 / APX 6000 portable radio also M2.5 × 13 mm
- HP Compaq nx7300 also M2.5 × 13 mm
- HP Compaq nw8440 also M2.5 × 13 mm
- HP Compaq 6510b also M2.5 × 13 mm
- Lab balance leveling foot also M2.5 × 13 mm
- HP Compaq 6515b also M2.5 × 13 mm
- HP Compaq nc6220 also M2.5 × 13 mm
Questions about Dell Alienware 17 R4 screws
- What size screw does Dell Alienware 17 R4 use?
- M2.5 × 13 mm for base cover Phillips screws (rear six).
- How long are the screws in Dell Alienware 17 R4?
- The record gives 13 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- What is the thread pitch of an M2.5 screw?
- 0.45 mm (coarse), which is the standard pitch for M2.5 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.05 mm and the normal clearance hole is 2.9 mm.
- What screwdriver do I need for Dell Alienware 17 R4?
- The source lists a Phillips drive. Standard M2.5 heads otherwise take PH1 (Phillips) or T8 (Torx), or a 2 mm hex key.
- Can I use an imperial screw instead of M2.5?
- No. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in. Use a true M2.5 screw so it does not cross-thread or strip the hole.