How long are the screws in Optical breadboard / optical table (metric)?

The records range from 6 to 25 mm depending on the position, so match each screw to its own hole.

What is the thread pitch of an M6 screw?

1 mm (coarse), which is the standard pitch for M6 machine screws; a 0.75 mm fine pitch exists but is uncommon. The tap drill is 5 mm and the normal clearance hole is 6.6 mm.

What screwdriver do I need for Optical breadboard / optical table (metric)?

The sources do not name the drive. For M6, Phillips heads normally take PH3 and Torx heads T30; socket heads take a 5 mm hex key.

Can I use an imperial screw instead of M6?

No. Imperial look-alike: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6. Use a true M6 screw so it does not cross-thread or strip the hole.

Optical breadboard / optical table (metric) screw size

M6 · 6 to 25 mm long

Our records put Optical breadboard / optical table (metric) on M6 screws in lengths from 6 to 25 mm.

Where it is used: metric breadboards are tapped M6 on a 25mm grid — the metric alternative to 1/4-20 on 1in centers.

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

For reference, M6 is 6 mm across the threads at 1 mm pitch. The imperial size people confuse it with: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6.

Optical breadboard / optical table (metric) 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
M6	6–25 mm	1 mm	not stated	not stated	Metric breadboards are tapped M6 on a 25mm grid — the metric alternative to 1/4-20 on 1in centers	Confirmed

Fitment records and sources

M66-25mmconfirmed

Metric breadboards are tapped M6 on a 25mm grid — the metric alternative to 1/4-20 on 1in centers

pitch 1 mm · tap 5 mm · clearance 6.6 mm · PH3 / Torx T30

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 M6 screw measures about 6 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
Pitch: 1 mm from one thread crest to the next (10 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 6–25 mm, which means different positions take different lengths — match each hole to its own screw.
Driver: the source does not name the drive. Standard M6 heads take PH3 for Phillips and T30 for Torx, and a 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 M6 is about 7-10 N·m into metal threads and 2.5-4.0 N·m into plastic bosses; snug it up and stop.

Common mix-ups with M6

Optical breadboards are metric only when the part number ends in /M; the default in North America is 1/4-20.
Optical tables come in metric (M6 on 25mm centres) and imperial (1/4-20 on 1in centres) — mixing them cross-threads the table.

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 Optical breadboard / optical table (metric), closest length match first.

Newport M-ST-UT2-410-8 SmartTable also M6 × 25 mm
Cinema camera cheese plates & cages also M6 × 6–12 mm
Thorlabs MB2090/M aluminum optical breadboard also M6 × 12.7 mm
Newport M-RPR-410-8 optical table also M6 × 25 mm
AV equipment rack cage-nut kit also M6 × 16 mm
Windshield ADAS camera bracket also M6 × 8–14 mm
Newport M-RS2000-410-8 optical table also M6 × 25 mm
Newport M-RPR-46-8 optical table also M6 × 25 mm

Questions about Optical breadboard / optical table (metric) screws

What size screw does Optical breadboard / optical table (metric) use?: M6 × 6–25 mm for metric breadboards are tapped M6 on a 25mm grid — the metric alternative to 1/4-20 on 1in centers.
How long are the screws in Optical breadboard / optical table (metric)?: The records range from 6 to 25 mm depending on the position, so match each screw to its own hole.
What is the thread pitch of an M6 screw?: 1 mm (coarse), which is the standard pitch for M6 machine screws; a 0.75 mm fine pitch exists but is uncommon. The tap drill is 5 mm and the normal clearance hole is 6.6 mm.
What screwdriver do I need for Optical breadboard / optical table (metric)?: The sources do not name the drive. For M6, Phillips heads normally take PH3 and Torx heads T30; socket heads take a 5 mm hex key.
Can I use an imperial screw instead of M6?: No. Imperial look-alike: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6. Use a true M6 screw so it does not cross-thread or strip the hole.

Heads up: shipping delay