HP EliteBook 2540p screw size
M2 / M2.5 / M3 · 2 to 6 mm long
The screws used on HP EliteBook 2540p are M2, M2.5 and M3 in lengths from 2 to 6 mm.
There are 22 separate fitment records for it, including card reader (qty 2, broadhead, Phillips) (M2), display (qty 1, Torx T8) (M2) and hinge (qty 3, Phillips,Torx T8) (M2), plus 19 more in the table below.
Head and drive, as the sources state them: Phillips and Torx T8 drives.
22 of the 22 records are marked confirmed, drawn from 1 source (h10032.www1.hp.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.
HP EliteBook 2540p 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 | 2 mm | 0.4 mm | not stated | Phillips | Card reader (qty 2, broadhead, Phillips) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | Torx T8 | Display (qty 1, Torx T8) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | Torx T8 | Hinge (qty 3, Phillips,Torx T8) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | Phillips | Optical drive (qty 2, Phillips) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | Torx T8 | Palm rest (qty 1, Torx T8) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | Phillips | Speaker (qty 1, Phillips) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | Phillips | Unspecified (qty 2, Phillips) | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | Phillips | Card reader (qty 1, broadhead, Phillips) | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | Torx T8 | Fan (qty 1, Torx T8) | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | Phillips | Hard drive (qty 2, Phillips) | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | Phillips | Memory (qty 1, Phillips) | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | Phillips | Optical drive (qty 2, Phillips) | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | Torx T8 | Palm rest (qty 1, Torx T8) | Confirmed |
| M2 | 6 mm | 0.4 mm | not stated | Torx T8 | Display (qty 2, Torx T8) | Confirmed |
| M2 | 6 mm | 0.4 mm | not stated | Phillips | Speaker (qty 1, Phillips) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | Torx T8 | Display bezel (qty 4, Torx T8) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | Torx T8 | Palm rest (qty 4, Torx T8) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | Torx T8 | System board (qty 1, Torx T8) | Confirmed |
| M2.5 | 6 mm | 0.45 mm | not stated | Torx T8 | Display (qty 2, Torx T8) | Confirmed |
| M2.5 | 6 mm | 0.45 mm | not stated | Torx T8 | Palm rest (qty 3, Torx T8) | Confirmed |
| M2.5 | 6 mm | 0.45 mm | not stated | Phillips | Wireless card (qty 2, Phillips) | Confirmed |
| M3 | 3 mm | 0.5 mm | not stated | Phillips | Hard drive (qty 4, Phillips) | Confirmed |
Fitment records and sources
Card reader (qty 2, broadhead, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 1, Torx T8)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Hinge (qty 3, Phillips,Torx T8)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Optical drive (qty 2, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Palm rest (qty 1, Torx T8)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Speaker (qty 1, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Unspecified (qty 2, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Card reader (qty 1, broadhead, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Fan (qty 1, Torx T8)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Hard drive (qty 2, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Memory (qty 1, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Optical drive (qty 2, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Palm rest (qty 1, Torx T8)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display (qty 2, Torx T8)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Speaker (qty 1, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Display bezel (qty 4, Torx T8)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Palm rest (qty 4, Torx T8)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
System board (qty 1, Torx T8)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display (qty 2, Torx T8)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Palm rest (qty 3, Torx T8)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Wireless card (qty 2, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Hard drive (qty 4, Phillips)
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 2–6 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source names a Phillips drive. For comparison, standard M2 heads take PH0 (Phillips) or T6 (Torx), or a 1.5 mm hex key.
- 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
- M.2 SSD mounting screws (M2 x 3mm) are frequently mislabeled generically as 'M.2 screws' which can be confused with the M2 metric thread designation — they do coincide numerically here but are conceptually distinct (M.2 = card format, M2 = thread size).
- M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.
- 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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More in Laptops & PCs
The same screw also fits
Devices whose records share a thread with HP EliteBook 2540p, closest length match first.
- Lenovo ThinkPad T510i also M2 × 3 mm
- HP Pavilion DV9200 also M2 × 3 mm
- Lenovo ThinkPad L15 Gen 4 also M2 × 2 mm
- HP 16-f1000 also M2 × 2 mm
- Lenovo IdeaPad P500 also M2 × 2 mm
- Lenovo ThinkPad L420 also M2 × 2 mm
- Lenovo ideapad 330E-17ICH also M2 × 3 mm
- Lenovo ThinkPad X21 also M2 × 3 mm
Questions about HP EliteBook 2540p screws
- What size screw does HP EliteBook 2540p use?
- M2 × 2 mm for card reader (qty 2, broadhead, Phillips); M2 × 3 mm for display (qty 1, Torx T8); M2 × 4 mm for hinge (qty 3, Phillips,Torx T8); M2 × 4 mm for optical drive (qty 2, Phillips); M2 × 4 mm for palm rest (qty 1, Torx T8); M2 × 4 mm for speaker (qty 1, Phillips); M2 × 4 mm for unspecified (qty 2, Phillips); M2 × 5 mm for card reader (qty 1, broadhead, Phillips); M2 × 5 mm for fan (qty 1, Torx T8); M2 × 5 mm for hard drive (qty 2, Phillips); M2 × 5 mm for memory (qty 1, Phillips); M2 × 5 mm for optical drive (qty 2, Phillips); M2 × 5 mm for palm rest (qty 1, Torx T8); M2 × 6 mm for display (qty 2, Torx T8); M2 × 6 mm for speaker (qty 1, Phillips); M2.5 × 5 mm for display bezel (qty 4.
- How long are the screws in HP EliteBook 2540p?
- The records range from 2 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 HP EliteBook 2540p?
- The source lists a Phillips and Torx T8 drive. Standard M2 heads otherwise take PH0 (Phillips) or T6 (Torx), or 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 HP EliteBook 2540p?
- TechSpareWarehouse (our own store) lists M2 x 2mm, M2 x 3mm and M2 x 4mm, which match lengths in the records above.