How long are the screws in Slim optical drives (9.5 / 12.7mm)?

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 M3 screw?

0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.

What screwdriver do I need for Slim optical drives (9.5 / 12.7mm)?

The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.

Can I use an imperial screw instead of M3?

No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.

Where can I buy replacement screws for Slim optical drives (9.5 / 12.7mm)?

TechSpareWarehouse (our own store) lists M3 x 3mm and M3 x 4mm, which match lengths in the records above.

Slim optical drives (9.5 / 12.7mm) screw size

M3 · 3 to 4 mm long

Slim optical drives (9.5 / 12.7mm) takes M3 metric screws in lengths from 3 to 4 mm.

It is listed for bezel and mounting bracket screws, unlike desktop 5.25in bays.

This entry is marked reported and comes from support-in.wd.com.

For reference, M3 is 3 mm across the threads at 0.5 mm pitch. The imperial size people confuse it with: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.

Slim optical drives (9.5 / 12.7mm) 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
M3	3–4 mm	0.5 mm	not stated	not stated	bezel and mounting bracket screws, unlike desktop 5.25in bays	Reported

Fitment records and sources

M33-4mmreported

bezel and mounting bracket screws, unlike desktop 5.25in bays

pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10

Source

How to check the screw before you buy

Do not confuse metric mounting screws with the 1/4-20 or 3/8-16 tripod threads that cameras and clamps also carry.
Diameter: across the threads an M3 screw measures about 3 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
Pitch: 0.5 mm from one thread crest to the next (20 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 M3 heads take PH1 for Phillips and T10 for Torx, and a 2.5 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 M3 is about 80-130 N·cm into metal threads and 35-60 N·cm into plastic bosses; snug it up and stop.

Common mix-ups with M3

3.5in drives and 5.25in bays are 6-32; 2.5in drives and motherboard standoffs are M3. Keep the two bins apart.
3.5in desktop and enterprise hard drives are 6-32 UNC imperial, not M3 - only the 2.5in form factor is metric.

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 Slim optical drives (9.5 / 12.7mm), closest length match first.

Meade LX200 Barlow / eyepiece retaining screw also M3 × 4 mm
Arca-style quick-release plate also M3 × 4 mm
Aimpoint Micro T-1/T-2/H-1/H-2 standard mount also M3 × 4 mm
Camera cage shells (SmallRig-style) also M3 × 4 mm
Wimberley AP-606 Arca-Swiss lens foot plate also M3 × 3 mm
Aimpoint Micro T-1/T-2/H-1/H-2 standard mount screw also M3 × 4 mm
Olympus BH-2 microscope frame also M3 × 4 mm
Panasonic WV-NF5C outdoor camera housing also M3 × 3 mm

Questions about Slim optical drives (9.5 / 12.7mm) screws

What size screw does Slim optical drives (9.5 / 12.7mm) use?: M3 × 3–4 mm for bezel and mounting bracket screws, unlike desktop 5.25in bays.
How long are the screws in Slim optical drives (9.5 / 12.7mm)?: 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 M3 screw?: 0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.
What screwdriver do I need for Slim optical drives (9.5 / 12.7mm)?: The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.
Can I use an imperial screw instead of M3?: No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.
Where can I buy replacement screws for Slim optical drives (9.5 / 12.7mm)?: TechSpareWarehouse (our own store) lists M3 x 3mm and M3 x 4mm, which match lengths in the records above.

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