What size screw does Valve Index controller (Knuckles) use?

M2 × 4–8 mm for strap and shell fasteners.

How long are the screws in Valve Index controller (Knuckles)?

The records range from 4 to 8 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 Valve Index controller (Knuckles)?

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 Valve Index controller (Knuckles)?

TechSpareWarehouse (our own store) lists M2 x 4mm, M2 x 5mm and M2 x 6mm, which match lengths in the records above.

Valve Index controller (Knuckles) screw size

M2 · 4 to 8 mm long

The screws used on Valve Index controller (Knuckles) are M2 in lengths from 4 to 8 mm.

The record covers strap and shell fasteners.

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

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.

Valve Index controller (Knuckles) 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	4–8 mm	0.4 mm	not stated	not stated	Strap and shell fasteners	Reported

Fitment records and sources

M24-8mmreported

Strap and shell fasteners

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

Source

How to check the screw before you buy

Consoles and controllers often use security drives (tri-wing, Torx) and short screws into plastic bosses, so do not over-tighten.
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 4–8 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

Legacy Williams/Bally pinball fasteners are imperial (#5-40, #6-32); the M4 coil bracket is a modern Stern-era part.
Packaging/labeling equipment manuals (e.g., cab print-and-apply applicators) mix M2 through M6 fasteners across a single machine for very different assemblies (sensors vs. frame vs. drive) — do not generalize one thread size to 'the machine' as a whole; cite the specific subassembly.

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 Valve Index controller (Knuckles), closest length match first.

Meta Quest 2 controller also M2 × 4–6 mm
Keychron K3 / K3 Pro / K3 Max also M2 × 6 mm
HTC Vive controller also M2 × 4–6 mm
Sony PSVR headset also M2 × 5–8 mm
Valve Index headset face gasket mount also M2 × 4–6 mm
Xbox One wireless controller also M2 × 6–8 mm
Xbox Elite Series 2 controller also M2 × 4–8 mm
HP Compaq Presario M2300 also M2 × 4 mm

Questions about Valve Index controller (Knuckles) screws

What size screw does Valve Index controller (Knuckles) use?: M2 × 4–8 mm for strap and shell fasteners.
How long are the screws in Valve Index controller (Knuckles)?: The records range from 4 to 8 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 Valve Index controller (Knuckles)?: 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 Valve Index controller (Knuckles)?: TechSpareWarehouse (our own store) lists M2 x 4mm, M2 x 5mm and M2 x 6mm, which match lengths in the records above.

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