M.2 (NGFF) SSD module retention screw size
M2 · 2 to 4.2 mm long
If you are replacing a screw on M.2 (NGFF) SSD module retention, the thread is M2 in lengths from 2 to 4.2 mm.
Where it is used: PCI-SIG M.2 spec defines the module retention screw as M2.
This entry is marked confirmed and comes from pcisig.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.
M.2 (NGFF) SSD module retention 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 | 2–4.2 mm | 0.4 mm | not stated | not stated | PCI-SIG M.2 spec defines the module retention screw as M2 | Confirmed |
Fitment records and sources
PCI-SIG M.2 spec defines the module retention screw as M2
pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6
How to check the screw before you buy
- Take one original screw out first and measure it before ordering; the record above tells you the thread, the original screw tells you the exact length and head.
- Diameter: across the threads an M2 screw measures about 2 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- 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 2–4.2 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 (2.00mm, 0.4mm pitch) is NOT the same as #2-56 UNC (2.18mm) — close enough to cross-thread and strip if forced.
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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10x M2 x 2mm Phillips Screws for HP EliteBook 840 G6 846 G6 SSD WiFi
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M2 x 2mm Phillips Flat Head Screw for HP EliteBook 840/846 G6 Laptop Repair - Pack of 100 Black
$7.99
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M2 x 2.5mm Screws for Dell XPS 14 9440 M.2 SSD Drive – 10-Pack Black
$4.99 -
M2 x 2.5mm Screws for ASUS ROG Strix G17 G713 SSD WiFi Touchpad 10-Pack Black
$4.99
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M2 x 3mm Screws for Dell XPS 13 9340 Base Cover SSD Shield 10-Pack Black
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10x M2 x 3mm Phillips Screws for Lenovo ThinkPad X131e Chromebook WiFi SSD
$4.99
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Dell Latitude 5530 Replacement Screws Sold Individually – M2 x 3mm, M2 x 4mm, M2.5 x 5mm Phillips Wafer Head, Black
$0.10Choose size
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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
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Devices whose records share a thread with M.2 (NGFF) SSD module retention, closest length match first.
- DIN 912 socket-head cap screw also M2 × 3–4.2 mm
- DIN 965 / ISO 7046 countersunk Phillips screw also M2 × 3–4.2 mm
- Micro servo horn/arm screw also M2 × 4 mm
- Medtronic 670G insulin pump battery door/case screws also M2 × 4 mm
- HP Compaq 516 also M2 × 2 mm
- HP EliteBook 835 G8 also M2 × 2 mm
- Lenovo File-1645565779 also M2 × 3.5 mm
- HP 541 also M2 × 2 mm
Questions about M.2 (NGFF) SSD module retention screws
- What size screw does M.2 (NGFF) SSD module retention use?
- M2 × 2–4.2 mm for PCI-SIG M.2 spec defines the module retention screw as M2.
- How long are the screws in M.2 (NGFF) SSD module retention?
- The records range from 2 to 4.2 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 M.2 (NGFF) SSD module retention?
- 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 M.2 (NGFF) SSD module retention?
- TechSpareWarehouse (our own store) lists M2 x 2mm, M2 x 2.5mm and M2 x 3mm, which match lengths in the records above.