What size screw does Wimberley AP-640 replacement lens foot use?

M3 × 6–8 mm for 4x M3 mounting screws plus 2x M3 safety-stop screws.

How long are the screws in Wimberley AP-640 replacement lens foot?

The records range from 6 to 8 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 Wimberley AP-640 replacement lens foot?

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 Wimberley AP-640 replacement lens foot?

TechSpareWarehouse (our own store) lists M3 x 6mm and M3 x 8mm, which match lengths in the records above.

Wimberley AP-640 replacement lens foot screw size

M3 · 6 to 8 mm long

Wimberley AP-640 replacement lens foot takes M3 metric screws in lengths from 6 to 8 mm.

It is listed for 4x M3 mounting screws plus 2x M3 safety-stop screws.

This entry is marked confirmed and comes from tripodhead.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.

Wimberley AP-640 replacement lens foot 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	6–8 mm	0.5 mm	not stated	not stated	4x M3 mounting screws plus 2x M3 safety-stop screws	Confirmed

Fitment records and sources

M36-8mmconfirmed

4x M3 mounting screws plus 2x M3 safety-stop screws

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 6–8 mm, which means different positions take different lengths — match each hole to its own screw.
Driver: the source does not name the drive. Standard 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

On FPV motors, screw length is safety-critical: one turn too long and the screw crushes the motor windings. Measure arm + base depth, and dry-fit before powering up.
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.

More in Cameras & Optics

1.25" eyepiece/diagonal/SCT visual back thumb screw Aimpoint Comp M4 / M4s LRP & TNP mount Aimpoint Micro T-1/T-2/H-1/H-2 standard mount Aimpoint Micro T-1/T-2/H-1/H-2 standard mount screw Aimpoint SM-2001/2007 Micro T1/T2 mount Airsoft red dot sight mounting screw set (Laylax/Quintes Sence)Airsoft/firearm red-dot sight optic mounting screws (Vortex Viper, Swampfox patterns)Alpine and touring ski bindings (Binding Freedom inserts)Arca-style quick-release plate ARRI plate for Sony VENICE 1/2 Artesky 340mm Vixen Dovetail Bar Astromania finder scope dovetail base

Browse all 278 in Cameras & Optics →

The same screw also fits

Devices whose records share a thread with Wimberley AP-640 replacement lens foot, closest length match first.

Olympus BH-2 microscope frame also M3 × 6–8 mm
Wimberley Arca-Swiss replacement feet (AP-500/600 series) also M3 × 6 mm
Glock MOS adapter plate to slide (Docter/Meopta/Insight/Vortex/Burris footprint) also M3 × 6 mm
Telescope thumb screws for diagonals, adapters and focusers also M3 × 7–8 mm
Microscope objective turret and stage also M3 × 6–8 mm
Wimberley P-20 Arca-Swiss style tripod lens plate also M3 × 6 mm
Aimpoint SM-2001/2007 Micro T1/T2 mount also M3 × 6 mm
Holosun SCS-MOS optic mounting screw (Glock) also M3 × 6 mm

Questions about Wimberley AP-640 replacement lens foot screws

What size screw does Wimberley AP-640 replacement lens foot use?: M3 × 6–8 mm for 4x M3 mounting screws plus 2x M3 safety-stop screws.
How long are the screws in Wimberley AP-640 replacement lens foot?: The records range from 6 to 8 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 Wimberley AP-640 replacement lens foot?: 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 Wimberley AP-640 replacement lens foot?: TechSpareWarehouse (our own store) lists M3 x 6mm and M3 x 8mm, which match lengths in the records above.

Heads up: shipping delay