HP 550 screw size
M2 / M2.5 / M3 · 2 to 12 mm long
If you are replacing a screw on HP 550, the thread is M2, M2.5 and M3 in lengths from 2 to 12 mm.
There are 24 separate fitment records for it, including palm rest (qty 3, broadhead, Torx) (M2), card reader (qty 2, Phillips) (M2) and hinge (qty 4, Phillips) (M2), plus 21 more in the table below.
Head and drive, as the sources state them: Torx, Phillips and Torx T8 drives.
24 of the 24 records are marked confirmed, drawn from 1 source (tim.id.au).
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 550 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 | Torx | Palm rest (qty 3, broadhead, Torx) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | Phillips | Card reader (qty 2, Phillips) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | Phillips | Hinge (qty 4, Phillips) | 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 | System board (qty 2, Torx T8) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | Phillips | Touchpad (qty 2, Phillips) | Confirmed |
| M2 | 4 mm | 0.4 mm | not stated | Phillips | Wireless card (qty 2, Phillips) | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | Phillips | Hard drive (qty 2, captive, Phillips)captive | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | Phillips | Memory (qty 99, captive, Phillips)captive | Confirmed |
| M2 | 5 mm | 0.4 mm | not stated | Phillips | Wireless card (captive, Phillips)captive | Confirmed |
| M2 | 6 mm | 0.4 mm | not stated | Torx T8 | System board (qty 2, Torx T8) | Confirmed |
| M2 | 8 mm | 0.4 mm | not stated | Phillips | Card reader (qty 2, Phillips) | Confirmed |
| M2.5 | 10 mm | 0.45 mm | not stated | Phillips | Heat sink (qty 4, Phillips) | Confirmed |
| M2.5 | 12 mm | 0.45 mm | not stated | Phillips | Hard drive (captive, Phillips)captive | Confirmed |
| M2.5 | 3 mm | 0.45 mm | not stated | Torx T8 | Unspecified (qty 2, broadhead, Torx T8) | Confirmed |
| M2.5 | 4 mm | 0.45 mm | not stated | Torx T8 | Speaker (qty 2, Torx T8) | Confirmed |
| M2.5 | 4 mm | 0.45 mm | not stated | Torx T8 | System board (qty 1, Torx T8) | Confirmed |
| M2.5 | 4 mm | 0.45 mm | not stated | Phillips | Unspecified (qty 2, Phillips) | Confirmed |
| M2.5 | 4 mm | 0.45 mm | not stated | Phillips | Wireless card (qty 2, Phillips) | Confirmed |
| M2.5 | 6 mm | 0.45 mm | not stated | Torx T8 | Display (qty 4, Torx T8) | Confirmed |
| M2.5 | 6 mm | 0.45 mm | not stated | Torx T8 | Display bezel (qty 8, Torx T8) | Confirmed |
| M2.5 | 7 mm | 0.45 mm | not stated | Phillips | Fan (qty 2, Phillips) | Confirmed |
| M2.5 | 9 mm | 0.45 mm | not stated | Torx T8 | Unspecified (qty 2, broadhead, Torx T8) | Confirmed |
| M3 | 4 mm | 0.5 mm | not stated | Phillips | Hard drive (qty 2, Phillips) | Confirmed |
Fitment records and sources
Palm rest (qty 3, broadhead, Torx)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Card reader (qty 2, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Hinge (qty 4, 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
System board (qty 2, Torx T8)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Touchpad (qty 2, 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
Hard drive (qty 2, captive, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Memory (qty 99, captive, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Wireless card (captive, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
System board (qty 2, Torx T8)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Card reader (qty 2, Phillips)
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
Heat sink (qty 4, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Hard drive (captive, Phillips)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Unspecified (qty 2, broadhead, Torx T8)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Speaker (qty 2, 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
Unspecified (qty 2, Phillips)
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
Display (qty 4, Torx T8)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Display bezel (qty 8, Torx T8)
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
Unspecified (qty 2, broadhead, Torx T8)
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Hard drive (qty 2, 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 2–12 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source names a Torx 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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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 HP 550, closest length match first.
- Lenovo ThinkPad W540 also M2 × 2 mm
- Dell Vostro 14 3425 also M2 × 2 mm
- HP 245 G5 also M2 × 2 mm
- Dell Precision M40 also M2 × 4 mm
- Acer Aspire 7530 also M2 × 6 mm
- Lenovo G405 also M2 × 6 mm
- HP EliteBook 645 G10 also M2 × 2 mm
- Lenovo ideapad 330-17AST D also M2 × 6 mm
Questions about HP 550 screws
- What size screw does HP 550 use?
- M2 × 2 mm for palm rest (qty 3, broadhead, Torx); M2 × 4 mm for card reader (qty 2, Phillips); M2 × 4 mm for hinge (qty 4, Phillips); M2 × 4 mm for optical drive (qty 2, Phillips); M2 × 4 mm for system board (qty 2, Torx T8); M2 × 4 mm for touchpad (qty 2, Phillips); M2 × 4 mm for wireless card (qty 2, Phillips); M2 × 5 mm for hard drive (qty 2, captive, Phillips); M2 × 5 mm for memory (qty 99, captive, Phillips); M2 × 5 mm for wireless card (captive, Phillips); M2 × 6 mm for system board (qty 2, Torx T8); M2 × 8 mm for card reader (qty 2, Phillips); M2.5 × 10 mm for heat sink (qty 4, Phillips); M2.5 × 12 mm for hard drive (captive, Phillips); M2.5 × 3 mm for unspecified (qty 2, broadhead, T.
- How long are the screws in HP 550?
- The records range from 2 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 HP 550?
- The source lists a Torx, 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 550?
- TechSpareWarehouse (our own store) lists M2 x 2mm, M2 x 4mm and M2 x 5mm, which match lengths in the records above.