Telescope dovetail rail / mounting plate screw size
M6 · length not stated in the sources
The screws used on Telescope dovetail rail / mounting plate are M6. None of the sources we found gives an exact length, so measure the original before you order.
It is listed for dovetail bars offer M6 plus 1/4in and 3/8in camera thread options.
This entry is marked confirmed and comes from amazon.in.
An M6 screw is 6 mm in diameter with a 1 mm pitch, tapped with a 5 mm drill; imperial look-alike: 1/4in-20 (6.35 mm) — the tripod/camera thread; visibly larger than M6.
Telescope dovetail rail / mounting plate 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 | Dovetail bars offer M6 plus 1/4in and 3/8in camera thread options | Confirmed |
Fitment records and sources
Dovetail bars offer M6 plus 1/4in and 3/8in camera thread options
pitch 1 mm · tap 5 mm · clearance 6.6 mm · PH3 / Torx T30
How to check the screw before you buy
- Camera and optics hardware often uses short screws into thin threaded plates, so check engagement before tightening fully.
- 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.
- Astro dovetail hardware is inconsistent: Losmandy-brand dovetail plate screws are 1/4-20 (imperial) per Losmandy/Astro-Physics documentation, while PrimaLuceLab's PLUS-standard dovetails explicitly use M6 — don't assume metric across all 'Losmandy-style' dovetail ecosystems.
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Devices whose records share a thread with Telescope dovetail rail / mounting plate, closest length match first.
- Orion StarMax 127 base mount bolts also M6
- TS-Optics Losmandy-style dovetail plate, 200mm (L-UP7) also M6
- Telescope Vixen dovetail saddle clamp also M6
- Thorlabs circular solid aluminum breadboards (MBR /M) also M6
- iOptron Carbon Fiber Tripod (#8061/8061A) also M6
- Edmund Optics metric post holders also M6
- TS Optics Losmandy-style dovetail bar, 254mm long flat base (PSL2) also M6
- Vivotek AM-520 camera mounting cap also M6
Questions about Telescope dovetail rail / mounting plate screws
- What size screw does Telescope dovetail rail / mounting plate use?
- M6 for dovetail bars offer M6 plus 1/4in and 3/8in camera thread options.
- How long are the screws in Telescope dovetail rail / mounting plate?
- 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 Telescope dovetail rail / mounting plate?
- 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.