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.

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.

J-GUANG PCB screw terminal block (control electronics, signal-level wiring in pumps/kiosks/meters) screw size

M2 · 4 to 6 mm long

If you are replacing a screw on J-GUANG PCB screw terminal block (control electronics, signal-level wiring in pumps/kiosks/meters), the thread is M2 in lengths from 4 to 6 mm.

It is listed for J-GUANG's terminal block torque specification guide explicitly states M2 screw with 0.2 Nm torque used in 2.0mm-2.54mm pitch PCB terminal blocks for signal wiring.

This entry is marked confirmed and comes from nbjge.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.

J-GUANG PCB screw terminal block (control electronics, signal-level wiring in pumps/kiosks/meters) screw specifications

One row per fitment record. Head, drive and torque are shown only where the source states them; pitch is the ISO coarse pitch for the thread.

Thread	Length	Pitch	Head	Drive	Torque	Where it goes	Status
M2	4–6 mm	0.4 mm	not stated	not stated	0.2 Nm	J-GUANG's terminal block torque specification guide explicitly states M2 screw with 0.2 Nm torque used in 2.0mm-2.54mm pitch PCB terminal blocks for signal wiring	Confirmed

Fitment records and sources

M2M2x4-M2x6confirmed

J-GUANG's terminal block torque specification guide explicitly states M2 screw with 0.2 Nm torque used in 2.0mm-2.54mm pitch PCB terminal blocks for signal wiring

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

Source

How to check the screw before you buy

Board standoffs and enclosure bosses set the usable length: the screw should clamp the board without bottoming in the standoff.
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 4–6 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.

Common mix-ups with M2

'M2' is sometimes used loosely by resellers to mean 'roughly 2mm' without a real ISO metric thread; only counted here when the source datasheet explicitly states 'M2' thread.
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 J-GUANG PCB screw terminal block (control electronics, signal-level wiring in pumps/kiosks/meters), closest length match first.

NovelKeys NK65 keyboard also M2 × 4 mm
Blood glucose meter PCB also M2 × 4–5 mm
Meta Quest 2 controller board also M2 × 4–5 mm
HP Pavilion / Spectre / EliteBook also M2 × 4 mm
Compact 2.5in drive enclosures also M2 × 4 mm
NovelKeys NK65 mechanical keyboard also M2 × 4–6 mm
TP-Link routers / switches also M2 × 4–6 mm
Sony PMW-EX1R camcorder - small controls also M2 × 4–6 mm

Questions about J-GUANG PCB screw terminal block (control electronics, signal-level wiring in pumps/kiosks/meters) screws

What size screw does J-GUANG PCB screw terminal block (control electronics, signal-level wiring in pumps/kiosks/meters) use?: M2 × 4–6 mm for J-GUANG's terminal block torque specification guide explicitly states M2 screw with 0.2 Nm torque used in 2.0mm-2.54mm pitch PCB terminal blocks for signal wiring.
How long are the screws in J-GUANG PCB screw terminal block (control electronics, signal-level wiring in pumps/kiosks/meters)?: The records range from 4 to 6 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 J-GUANG PCB screw terminal block (control electronics, signal-level wiring in pumps/kiosks/meters)?: 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.
How tight should the M2 screw on J-GUANG PCB screw terminal block (control electronics, signal-level wiring in pumps/kiosks/meters) be?: The source gives 0.2 Nm for J-GUANG's terminal block torque specification guide explicitly states M2 screw with 0.2 Nm torque used in 2.0mm-2.54mm pitch PCB terminal blocks for signal wiring.
Where can I buy replacement screws for J-GUANG PCB screw terminal block (control electronics, signal-level wiring in pumps/kiosks/meters)?: 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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