Dell Latitude C540 screw size
M2 / M2.5 / M3 · 3 to 12 mm long
The screws used on Dell Latitude C540 are M2, M2.5 and M3 in lengths from 3 to 12 mm.
There are 17 separate fitment records for it, including base cover (qty 2) (M2), bracket (qty 2) (M2) and display (qty 2) (M2), plus 14 more in the table below.
17 of the 17 records are marked confirmed, drawn from 1 source (dl.dell.com).
An M2 screw is 2 mm in diameter with a 0.4 mm pitch, tapped with a 1.6 mm drill; imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable.
Dell Latitude C540 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 | 3 mm | 0.4 mm | not stated | not stated | Base cover (qty 2) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Bracket (qty 2) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Display (qty 2) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Heat sink (qty 1) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Palm rest (qty 3) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | not stated | Unspecified (qty 2) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | not stated | Display (qty 5, black)black finish | Confirmed |
| M2.5 | 12 mm | 0.45 mm | not stated | not stated | Keyboard (qty 5) | Confirmed |
| M2.5 | 12 mm | 0.45 mm | not stated | not stated | Memory (qty 1, captive)captive | Confirmed |
| M2.5 | 12 mm | 0.45 mm | not stated | not stated | Palm rest (qty 3) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Base cover (qty 6) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Display (qty 6) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Display bezel (qty 6) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Fan (qty 3) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | Heat sink (qty 2) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | not stated | System board (qty 9) | Confirmed |
| M3 | 5 mm | 0.5 mm | not stated | not stated | Hard drive (qty 1) | Confirmed |
Fitment records and sources
Base cover (qty 2)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Bracket (qty 2)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 2)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Heat sink (qty 1)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Palm rest (qty 3)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Unspecified (qty 2)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 5, black)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Keyboard (qty 5)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Memory (qty 1, captive)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Palm rest (qty 3)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Base cover (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
Display bezel (qty 6)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Fan (qty 3)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Heat sink (qty 2)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
System board (qty 9)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Hard drive (qty 1)
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 3–12 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.
- Thorlabs' 16mm cage system standard plates use dual 4-40 (UNC) and M3 taps on the same plate (e.g., SP01), so metric and imperial fasteners are both valid depending on the region/kit purchased.
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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More in Laptops & PCs
The same screw also fits
Devices whose records share a thread with Dell Latitude C540, closest length match first.
- HP ProBook x360 440 G1 also M2 × 3 mm
- HP ProBook 440 G3 also M2 × 3 mm
- Dell Vostro 14 3478 also M2 × 3 mm
- Dell Alienware m16 R1 also M2 × 4 mm
- Lenovo B575 also M2 × 3 mm
- Lenovo ThinkPad X61 Tablet also M2 × 3 mm
- Lenovo ideapad 320R-17ISK also M2 × 3 mm
- HP EliteBook 8470w also M2 × 3 mm
Questions about Dell Latitude C540 screws
- What size screw does Dell Latitude C540 use?
- M2 × 3 mm for base cover (qty 2); M2 × 3 mm for bracket (qty 2); M2 × 3 mm for display (qty 2); M2 × 3 mm for heat sink (qty 1); M2 × 3 mm for palm rest (qty 3); M2 × 3 mm for unspecified (qty 2); M2 × 4 mm for display (qty 5, black); M2.5 × 12 mm for keyboard (qty 5); M2.5 × 12 mm for memory (qty 1, captive); M2.5 × 12 mm for palm rest (qty 3); M2.5 × 5 mm for base cover (qty 6); M2.5 × 5 mm for display (qty 6); M2.5 × 5 mm for display bezel (qty 6); M2.5 × 5 mm for fan (qty 3); M2.5 × 5 mm for heat sink (qty 2); M2.5 × 5 mm for system board (qty 9); M3 × 5 mm for hard drive (qty 1).
- How long are the screws in Dell Latitude C540?
- The records range from 3 to 12 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 C540?
- 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 C540?
- TechSpareWarehouse (our own store) lists M2 x 3mm, M2 x 4mm and M2.5 x 12mm, which match lengths in the records above.