Edmund Optics metric post holders screw size
M6 · length not stated in the sources
Our records put Edmund Optics metric post holders on M6 screws. None of the sources we found gives an exact length, so measure the original before you order.
The record covers metric post holder line uses an M6 x 1 base thread; 50.8mm holder stock 58-972.
This entry is marked confirmed and comes from edmundoptics.com.
M6 means a 6 mm nominal diameter with a 1 mm thread pitch. Imperial look-alike: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6.
Edmund Optics metric post holders 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 | not stated | 1 mm | not stated | not stated | Metric post holder line uses an M6 x 1 base thread; 50.8mm holder stock 58-972 | Confirmed |
Fitment records and sources
Metric post holder line uses an M6 x 1 base thread; 50.8mm holder stock 58-972
pitch 1 mm · tap 5 mm · clearance 6.6 mm · PH3 / Torx T30
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.
- 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
- TS-Optics Losmandy-style dovetail bars drill through-holes sized to accept either M6 metric screws or 1/4" imperial screws interchangeably in the same countersunk holes.
- Snowmobile/ATV/PWC switch and gauge hardware is mostly SAE inch; metric appears mainly on M6+ engine and driveline bolts.
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Devices whose records share a thread with Edmund Optics metric post holders, closest length match first.
- TS Optics Losmandy-style dovetail bar, 254mm long flat base (PSL2) also M6
- Vivotek AM-520 camera mounting cap also M6
- iOptron Carbon Fiber Tripod (#8061/8061A) also M6
- Thorlabs circular solid aluminum breadboards (MBR /M) also M6
- Telescope Vixen dovetail saddle clamp also M6
- Telescope dovetail rail / mounting plate also M6
- Orion StarMax 127 base mount bolts also M6
- TS-Optics Losmandy-style dovetail plate, 200mm (L-UP7) also M6
Questions about Edmund Optics metric post holders screws
- What size screw does Edmund Optics metric post holders use?
- M6 for metric post holder line uses an M6 x 1 base thread; 50.8mm holder stock 58-972.
- How long are the screws in Edmund Optics metric post holders?
- None of the sources states a length. Remove one screw and measure it from under the head to the tip (overall for a countersunk head).
- 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 Edmund Optics metric post holders?
- 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.