HP ProBook 4440s screw size
M2 / M2.5 / M3 · 2 to 7 mm long
If you are replacing a screw on HP ProBook 4440s, the thread is M2, M2.5 and M3 in lengths from 2 to 7 mm.
There are 23 separate fitment records for it, including palm rest (qty 3, broadhead, Phillips) (M2), palm rest (qty 3, pan, Phillips) (M2) and hinge (qty 3, Phillips) (M2), plus 20 more in the table below.
Head and drive, as the sources state them: pan head and Phillips and Torx T8 drives.
23 of the 23 records are marked confirmed, drawn from 1 source (h10032.www1.hp.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.
HP ProBook 4440s 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 | Palm rest (qty 3, broadhead, Phillips) | Confirmed |
| M2 | 2.5 mm | 0.4 mm | Pan head | Phillips | Palm rest (qty 3, pan, Phillips) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | Phillips | Hinge (qty 3, Phillips) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | Phillips | Speaker (qty 2, broadhead, Phillips) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | Phillips | Unspecified (qty 3, Phillips) | Confirmed |
| M2 | 3 mm | 0.4 mm | not stated | Phillips | Wireless card (qty 2, Phillips) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | Phillips | I/O board (qty 1, Phillips) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | Phillips | Hard drive (qty 4, Phillips) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | Phillips | Power button (qty 2, Phillips) | Confirmed |
| M2 | 7 mm | 0.4 mm | not stated | Phillips | Speaker (qty 2, Phillips) | Confirmed |
| M2.5 | 3 mm | 0.45 mm | not stated | Phillips | Hinge (qty 6, Phillips) | Confirmed |
| M2.5 | 3 mm | 0.45 mm | not stated | Phillips | Palm rest (qty 1, Phillips) | Confirmed |
| M2.5 | 4 mm | 0.45 mm | not stated | Phillips | Display (qty 2, Phillips) | Confirmed |
| M2.5 | 4.5 mm | 0.45 mm | not stated | Phillips | Battery (qty 2, Phillips) | Confirmed |
| M2.5 | 4.5 mm | 0.45 mm | not stated | Phillips | System board (qty 3, Phillips) | Confirmed |
| M2.5 | 4.5 mm | 0.45 mm | not stated | Phillips | Unspecified (qty 2, Phillips) | Confirmed |
| M2.5 | 5 mm | 0.45 mm | not stated | Phillips | Fan (qty 2, Phillips) | Confirmed |
| M2.5 | 6 mm | 0.45 mm | not stated | Phillips | Keyboard (qty 3, Phillips) | Confirmed |
| M2.5 | 6 mm | 0.45 mm | not stated | Phillips | Optical drive (qty 1, Phillips) | Confirmed |
| M2.5 | 6 mm | 0.45 mm | not stated | Torx T8 | Palm rest (qty 11, Torx T8) | Confirmed |
| M2.5 | 6 mm | 0.45 mm | not stated | Phillips | Unspecified (qty 3, Phillips) | Confirmed |
| M2.5 | 7 mm | 0.45 mm | not stated | Phillips | Hinge (qty 4, Phillips) | Confirmed |
| M3 | 3 mm | 0.5 mm | not stated | Phillips | Hard drive (qty 4, Phillips) | Confirmed |
Fitment records and sources
Palm rest (qty 3, broadhead, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Palm rest (qty 3, pan, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Hinge (qty 3, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Speaker (qty 2, broadhead, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Unspecified (qty 3, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Wireless card (qty 2, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
I/O board (qty 1, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Hard drive (qty 4, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Power button (qty 2, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Speaker (qty 2, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Hinge (qty 6, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Palm rest (qty 1, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display (qty 2, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Battery (qty 2, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
System board (qty 3, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Unspecified (qty 2, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Fan (qty 2, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Keyboard (qty 3, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Optical drive (qty 1, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Palm rest (qty 11, Torx T8)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Unspecified (qty 3, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Hinge (qty 4, 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: for pan head screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- The records span 2–7 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.
- LED strip clips strip easily — M3x12 into thin plastic should be hand-driven, never with a power driver.
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 ProBook 4440s, closest length match first.
- HP ProBook 440 G10 also M2 × 2 mm
- HP 340 G7 also M2 × 2 mm
- Lenovo ideapad 500S-13ISK also M2 × 2 mm
- Lenovo IdeaPad U310 Touch also M2 × 2.5 mm
- Lenovo G70-80 also M2 × 3 mm
- HP ProBook 465 G11 also M2 × 2 mm
- Lenovo Y500 also M2 × 2 mm
- Lenovo YOGA 730-15IKB also M2 × 2 mm
Questions about HP ProBook 4440s screws
- What size screw does HP ProBook 4440s use?
- M2 × 2 mm for palm rest (qty 3, broadhead, Phillips); M2 × 2.5 mm for palm rest (qty 3, pan, Phillips); M2 × 3 mm for hinge (qty 3, Phillips); M2 × 3 mm for speaker (qty 2, broadhead, Phillips); M2 × 3 mm for unspecified (qty 3, Phillips); M2 × 3 mm for wireless card (qty 2, Phillips); M2 × 4 mm for I/O board (qty 1, Phillips); M2 × 4 mm for hard drive (qty 4, Phillips); M2 × 4 mm for power button (qty 2, Phillips); M2 × 7 mm for speaker (qty 2, Phillips); M2.5 × 3 mm for hinge (qty 6, Phillips); M2.5 × 3 mm for palm rest (qty 1, Phillips); M2.5 × 4 mm for display (qty 2, Phillips); M2.5 × 4.5 mm for battery (qty 2, Phillips); M2.5 × 4.5 mm for system board (qty 3, Phillips); M2.5 × 4.5 mm f.
- How long are the screws in HP ProBook 4440s?
- The records range from 2 to 7 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 ProBook 4440s?
- 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 ProBook 4440s?
- TechSpareWarehouse (our own store) lists M2 x 2mm, M2 x 2.5mm and M2 x 3mm, which match lengths in the records above.