Laptop motherboards (cross-brand) screw size
M2.5 · 3 to 4 mm long
Our records put Laptop motherboards (cross-brand) on M2.5 screws in lengths from 3 to 4 mm.
It is listed for mainboard-to-chassis mounting screws, flat/pan head.
Head and drive, as the source states them: pan head.
This entry is marked reported and comes from techsparewarehouse.com.
M2.5 means a 2.5 mm nominal diameter with a 0.45 mm thread pitch. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in.
Laptop motherboards (cross-brand) 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 |
|---|---|---|---|---|---|---|
| M2.5 | 3–4 mm | 0.45 mm | Pan head | not stated | mainboard-to-chassis mounting screws, flat/pan head | Reported |
Fitment records and sources
mainboard-to-chassis mounting screws, flat/pan head
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
How to check the screw before you buy
- A screw that is even 1 mm too long in a laptop base can push into the keyboard, battery or a board trace, so match the length position by position.
- Diameter: across the threads an M2.5 screw measures about 2.5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.45 mm from one thread crest to the next (22.22 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 3–4 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard M2.5 heads take PH1 for Phillips and T8 for Torx, and a 2 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 M2.5 is about 45-70 N·cm into metal threads and 20-35 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M2.5
- M2 and M2.5 are both marketed for turntable headshells; buyers must check which their specific cartridge/tonearm brand uses.
- Eurorack rail thread depends on rail brand: Vector/SynthRacks rails use M2.5, others use M3.
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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25x M2.5 x 3mm Phillips Screws for Acer Nitro 5 SSD M.2 WiFi Card
$5.99 -
M2.5 x 4mm Screws for Lenovo IdeaPad 5 Pro 14 Display Hinge 10-Pack Black
$4.99 -
M2.5 x 4mm Screws for Lenovo IdeaPad 5 Pro 14 System Board Hinge 10-Pack Black
$4.99
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HP EliteBook 840 G8 Replacement Screws Sold Individually – M1.6 x 3mm, M2 x 2.5mm, M2 x 4mm, M2.5 x 4mm Phillips Wafer Head, Black
$0.10Choose size -
M2 x 2.5mm, M2 x 5mm, M2.5 x 4mm Phillips Wafer Head Screws Sold Individually – Black
$0.10Choose size -
M2.5 x 3mm Phillips Wafer Head Screws, Low Profile – 10-Pack Black
$4.99Choose size -
M2.5 x 3mm Black Wafer Head Screws for Lenovo ThinkPad S1 Yoga Display Replacement – 10-Pack Black
$4.99Choose size
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Browse all 2799 in Laptops & PCs →The same screw also fits
Devices whose records share a thread with Laptop motherboards (cross-brand), closest length match first.
- Lenovo ThinkPad L14 Gen 4 also M2.5 × 4 mm
- Lenovo ideapad 500-14ACZ also M2.5 × 4 mm
- HP ZBook Power 16 inch G11 A also M2.5 × 4 mm
- Lenovo ThinkPad 365 also M2.5 × 3 mm
- Lenovo E51-80 also M2.5 × 4 mm
- Acer Aspire 4740G also M2.5 × 3 mm
- HP Chromebook 14 G7 (id 38457196) also M2.5 × 3 mm
- HP 246 G4 also M2.5 × 3 mm
Questions about Laptop motherboards (cross-brand) screws
- What size screw does Laptop motherboards (cross-brand) use?
- M2.5 × 3–4 mm for mainboard-to-chassis mounting screws, flat/pan head.
- How long are the screws in Laptop motherboards (cross-brand)?
- The records range from 3 to 4 mm depending on the position, so match each screw to its own hole.
- What is the thread pitch of an M2.5 screw?
- 0.45 mm (coarse), which is the standard pitch for M2.5 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.05 mm and the normal clearance hole is 2.9 mm.
- What screwdriver do I need for Laptop motherboards (cross-brand)?
- The sources do not name the drive. For M2.5, Phillips heads normally take PH1 and Torx heads T8; socket heads take a 2 mm hex key.
- Can I use an imperial screw instead of M2.5?
- No. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in. Use a true M2.5 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Laptop motherboards (cross-brand)?
- TechSpareWarehouse (our own store) lists M2.5 x 3mm and M2.5 x 4mm, which match lengths in the records above.