How long are the screws in Camera lens focus ring set screw?

The records range from 2 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 Camera lens focus ring set screw?

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 Camera lens focus ring set screw?

TechSpareWarehouse (our own store) lists M2 x 2mm, M2 x 2.5mm and M2 x 3mm, which match lengths in the records above.

Camera lens focus ring set screw screw size

M2 · 2 to 4 mm long

Camera lens focus ring set screw takes M2 metric screws in lengths from 2 to 4 mm.

It is listed for grub screw locking the focus or zoom collar to the barrel.

Head and drive, as the source states them: set screw (headless) head.

This entry is marked reported and comes from alibaba.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.

Camera lens focus ring set screw 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	2–4 mm	0.4 mm	Set screw (headless)	not stated	grub screw locking the focus or zoom collar to the barrel	Reported

Fitment records and sources

M22-4mmreported

grub screw locking the focus or zoom collar to the barrel

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

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 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: for set screw (headless) screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
The records span 2–4 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

M2 (2.00mm, 0.4mm pitch) is NOT the same as #2-56 UNC (2.18mm) — close enough to cross-thread and strip if forced.

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 Camera lens focus ring set screw, closest length match first.

Raspberry Pi Camera Module also M2 × 4 mm
DJI Ronin 4D 6K also M2 × 4 mm
Partizan / Pilotix PT10 V3 FPV frame also M2 × 4 mm
Eyeglass frame screw (largest ISO spectacle size) also M2 × 3–4 mm
Olympus BH-2 / BH2-5RE microscope nosepiece also M2 × 3–4 mm
Some Nikkor lens mounts also M2 × 4 mm
Ophthalmic instrument service hardware (Duclos Lenses) also M2 × 2 mm
DJI Mavic Pro gimbal/camera mounting screws also M2 × 3 mm

Questions about Camera lens focus ring set screw screws

What size screw does Camera lens focus ring set screw use?: M2 × 2–4 mm for grub screw locking the focus or zoom collar to the barrel.
How long are the screws in Camera lens focus ring set screw?: The records range from 2 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 Camera lens focus ring set screw?: 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 Camera lens focus ring set screw?: TechSpareWarehouse (our own store) lists M2 x 2mm, M2 x 2.5mm and M2 x 3mm, which match lengths in the records above.

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