Dell Latitude D400 screw size
M2 / M2.5 / M3 · 1.8 to 6 mm long
The screws used on Dell Latitude D400 are M2, M2.5 and M3 in lengths from 1.8 to 6 mm.
There are 12 separate fitment records for it, including display (qty 2) (M2), palm rest (qty 2) (M2) and heat sink (qty 3) (M2), plus 9 more in the table below.
12 of the 12 records are marked confirmed, drawn from 1 source (dl.dell.com).
For reference, M2 is 2 mm across the threads at 0.4 mm pitch. The imperial size people confuse it with: #2-56 UNC (2.18 mm) is close but not interchangeable.
Dell Latitude D400 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 | 1.8 mm | 0.4 mm | not stated | not stated | Display (qty 2) | Confirmed |
| M2 | 1.8 mm | 0.4 mm | not stated | not stated | Palm rest (qty 2) | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | not stated | Heat sink (qty 3) | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | not stated | Keyboard (qty 2) | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | not stated | Palm rest (qty 1) | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | not stated | System board (qty 4) | Confirmed |
| M2.5 | 4 mm | 0.45 mm | not stated | not stated | Display | Confirmed |
| M2.5 | 4 mm | 0.45 mm | not stated | not stated | Display bezel (qty 6) | Confirmed |
| M2.5 | 6 mm | 0.45 mm | not stated | not stated | Display (qty 6) | Confirmed |
| M2.5 | 6 mm | 0.45 mm | not stated | not stated | Palm rest (qty 9) | Confirmed |
| M3 | 3 mm | 0.5 mm | not stated | not stated | Hard drive (qty 2) | Confirmed |
| M3 | 3 mm | 0.5 mm | not stated | not stated | Unspecified (qty 2) | Confirmed |
Fitment records and sources
Display (qty 2)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Palm rest (qty 2)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Heat sink (qty 3)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Keyboard (qty 2)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Palm rest (qty 1)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
System board (qty 4)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display bezel (qty 6)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display (qty 6)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Palm rest (qty 9)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Hard drive (qty 2)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
Unspecified (qty 2)
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- Laptop covers and brackets often mix two or three lengths of the same thread, so lay the screws out in the order they came out (a magnetic mat or a sheet of paper with the hole pattern drawn on it works).
- Diameter: across the threads an M2 screw measures about 2 mm with calipers (usually a hair under). This device also uses M2.5 / M3, so measure each screw rather than assuming they match.
- Pitch: 0.4 mm from one thread crest to the next (25 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 1.8–6 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M2 heads take PH0 for Phillips and T6 for Torx, and a 1.5 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 M2 is about 25-40 N·cm into metal threads and 12-20 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2 / M2.5 / M3
- The standard M.2 SSD screw is M2 x 3mm, but some laptops and handhelds use non-standard lengths or head shapes.
- Dell/HP/Lenovo manuals often list screws only by torque or head shape, so community teardowns are needed for diameter.
- 3.5in desktop and enterprise hard drives are 6-32 UNC imperial, not M3 - only the 2.5in form factor is metric.
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.
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M2 x 2mm Phillips Flat Head Screw for HP EliteBook 840/846 G6 Laptop Repair - Pack of 100 Black
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M2 x 5mm Replacement Bottom Case Screws for Dell Inspiron 3535 Laptop 10-Pack
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M2 x 5mm Phillips Wafer Head Screw for Dell G16 7630 Gaming Laptop Repair - Pack of 100 Black
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M2.5 x 4mm Screws for Lenovo IdeaPad 5 Pro 14 Display Hinge 10-Pack Black
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M2.5 x 4mm Screws for Lenovo IdeaPad 5 Pro 14 System Board Hinge 10-Pack Black
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ASUS ROG Strix G15 G513R Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 3mm, M2.5 x 6mm Phillips Wafer Head, Black
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ASUS ROG Strix G17 G713 Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 3mm, M2.5 x 6mm Phillips Wafer Head, Black
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More in Laptops & PCs
The same screw also fits
Devices whose records share a thread with Dell Latitude D400, closest length match first.
- HP Mini 2140 also M2 × 5 mm
- Dell Precision 3571 also M3 × 3 mm
- Acer Aspire 2920 also M2 × 5 mm
- Lenovo ThinkPad E15 Gen 3 also M2 × 5 mm
- Lenovo N24 also M2.5 × 4 mm
- Lenovo E10-30 also M2 × 5 mm
- Lenovo B40-70 also M2 × 5 mm
- Dell Vostro 15 3578 also M2 × 5 mm
Questions about Dell Latitude D400 screws
- What size screw does Dell Latitude D400 use?
- M2 × 1.8 mm for display (qty 2); M2 × 1.8 mm for palm rest (qty 2); M2 × 5 mm for heat sink (qty 3); M2 × 5 mm for keyboard (qty 2); M2 × 5 mm for palm rest (qty 1); M2 × 5 mm for system board (qty 4); M2.5 × 4 mm for display; M2.5 × 4 mm for display bezel (qty 6); M2.5 × 6 mm for display (qty 6); M2.5 × 6 mm for palm rest (qty 9); M3 × 3 mm for hard drive (qty 2); M3 × 3 mm for unspecified (qty 2).
- How long are the screws in Dell Latitude D400?
- The records range from 1.8 to 6 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M2 screw?
- 0.4 mm (coarse), which is the standard pitch for M2 machine screws; a 0.25 mm fine pitch exists but is uncommon. The tap drill is 1.6 mm and the normal clearance hole is 2.4 mm.
- What screwdriver do I need for Dell Latitude D400?
- The sources do not name the drive. For M2, Phillips heads normally take PH0 and Torx heads T6; socket heads take a 1.5 mm hex key.
- Can I use an imperial screw instead of M2?
- No. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable. Use a true M2 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Dell Latitude D400?
- TechSpareWarehouse (our own store) lists M2 x 2mm, M2 x 5mm and M2.5 x 4mm, which match lengths in the records above.