What size screw does Compact 2.5in drive enclosures use?

M2 × 3–4 mm for internal bracket screws in slim enclosures.

How long are the screws in Compact 2.5in drive enclosures?

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 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 Compact 2.5in drive enclosures?

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 Compact 2.5in drive enclosures?

TechSpareWarehouse (our own store) lists M2 x 3mm and M2 x 4mm, which match lengths in the records above.

Compact 2.5in drive enclosures screw size

M2 · 3 to 4 mm long

Compact 2.5in drive enclosures takes M2 metric screws in lengths from 3 to 4 mm.

Where it is used: internal bracket screws in slim enclosures.

This entry is marked reported and comes from ifixit.com.

M2 means a 2 mm nominal diameter with a 0.4 mm thread pitch. Imperial look-alike: #2-56 UNC (2.18 mm) is close but not interchangeable.

Compact 2.5in drive enclosures 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	3–4 mm	0.4 mm	not stated	not stated	Internal bracket screws in slim enclosures	Reported

Fitment records and sources

M23-4mmreported

Internal bracket screws in slim enclosures

pitch 0.4 mm · tap 1.6 mm · clearance 2.4 mm · PH0 / Torx T6

Source

How to check the screw before you buy

Rack and enclosure hardware mixes metric and imperial (#8-32, #10-32, #6-32), so confirm the thread before forcing a screw.
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 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 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

2.5in and 3.5in drive mounting is M3 or #6-32, never M2 — one of the most common mislabels in screw kits.
M2 CMM stylus threads are a de facto industry standard (Renishaw-originated) rather than a formal ISO CMM spec; do not confuse with M2 electronics screws which have different head/length conventions.

Pitch gauge · Screw size finder · Torque guide

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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The same screw also fits

Devices whose records share a thread with Compact 2.5in drive enclosures, closest length match first.

HP Pavilion / Spectre / EliteBook also M2 × 3–4 mm
Blood glucose meter PCB also M2 × 3–4 mm
Meta Quest 2 controller board also M2 × 3–4 mm
NovelKeys NK65 keyboard also M2 × 4 mm
J-GUANG PCB screw terminal block (control electronics, signal-level wiring in pumps/kiosks/meters) also M2 × 4 mm
Sony PMW-EX1R camcorder - internal boards also M2 × 3 mm
ASUS Chromebox 4 (CN66) also M2 × 3–4 mm
ASUS ZenBook / ROG also M2 × 3 mm

Questions about Compact 2.5in drive enclosures screws

What size screw does Compact 2.5in drive enclosures use?: M2 × 3–4 mm for internal bracket screws in slim enclosures.
How long are the screws in Compact 2.5in drive enclosures?: 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 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 Compact 2.5in drive enclosures?: 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 Compact 2.5in drive enclosures?: TechSpareWarehouse (our own store) lists M2 x 3mm and M2 x 4mm, which match lengths in the records above.

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