What size screw does Keychron K4 Pro and Q1 keyboards use?

M3 × 6 mm for bottom case hex screws (2.5mm hex key).

How long are the screws in Keychron K4 Pro and Q1 keyboards?

The record gives 6 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.

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 Keychron K4 Pro and Q1 keyboards?

The source lists a Hex socket (Allen) drive. Standard M3 heads otherwise take PH1 (Phillips) or T10 (Torx), or 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 Keychron K4 Pro and Q1 keyboards?

TechSpareWarehouse (our own store) lists M3 x 6mm, which matches the length in the records above.

Keychron K4 Pro and Q1 keyboards screw size

M3 · 6 mm long

If you are replacing a screw on Keychron K4 Pro and Q1 keyboards, the thread is M3, 6 mm long.

Where it is used: bottom case hex screws (2.5mm hex key).

Head and drive, as the source states them: Hex socket (Allen) drive.

This entry is marked confirmed and comes from keychron.com.

M3 means a 3 mm nominal diameter with a 0.5 mm thread pitch. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.

Keychron K4 Pro and Q1 keyboards 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	6 mm	0.5 mm	not stated	Hex socket (Allen)	bottom case hex screws (2.5mm hex key)	Confirmed

Fitment records and sources

M36mmconfirmed

bottom case hex screws (2.5mm hex key)

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

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 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 record states 6 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
Driver: the source names a Hex socket (Allen) drive. For comparison, standard M3 heads take PH1 (Phillips) or T10 (Torx), or a 2.5 mm hex key.
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

M3 (3.0mm, 0.5mm pitch) is not #6-32 UNC (~3.5mm) — they look identical and cross-thread, the single most common PC-building mistake.

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 Keychron K4 Pro and Q1 keyboards, closest length match first.

Diebold Nixdorf ATM ESC (Encrypting PIN Pad/keyboard) cross screw also M3 × 6 mm
Keychron Q1 mechanical keyboard also M3 × 6 mm
USB-C docking station chassis also M3 × 6 mm
M.2 standoff on PC motherboards also M3 × 6 mm
Zebra / Motorola barcode scanner bracket (Havis FlexiPole) also M3 × 6 mm
Dell P2219H also M3 × 6 mm
Dell U2720Q also M3 × 6 mm
FPV drone motors (5-inch class) also M3 × 6 mm

Questions about Keychron K4 Pro and Q1 keyboards screws

What size screw does Keychron K4 Pro and Q1 keyboards use?: M3 × 6 mm for bottom case hex screws (2.5mm hex key).
How long are the screws in Keychron K4 Pro and Q1 keyboards?: The record gives 6 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
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 Keychron K4 Pro and Q1 keyboards?: The source lists a Hex socket (Allen) drive. Standard M3 heads otherwise take PH1 (Phillips) or T10 (Torx), or 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 Keychron K4 Pro and Q1 keyboards?: TechSpareWarehouse (our own store) lists M3 x 6mm, which matches the length in the records above.

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