SkyWatcher-style finderscope shoe/bracket screw size
M4 · length not stated in the sources
The screws used on SkyWatcher-style finderscope shoe/bracket are M4. None of the sources we found gives an exact length, so measure the original before you order.
The record covers finderscope bracket shoe explicitly sold with M4 mounting screws.
This entry is marked confirmed and comes from 365astronomy.com.
For reference, M4 is 4 mm across the threads at 0.7 mm pitch. The imperial size people confuse it with: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
SkyWatcher-style finderscope shoe/bracket 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 |
|---|---|---|---|---|---|---|
| M4 | not stated | 0.7 mm | not stated | not stated | Finderscope bracket shoe explicitly sold with M4 mounting screws | Confirmed |
Fitment records and sources
Finderscope bracket shoe explicitly sold with M4 mounting screws
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Phone and wearable screws are tiny and often differ by fractions of a millimetre between positions; keep each one next to the hole it came from.
- Diameter: across the threads an M4 screw measures about 4 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.7 mm from one thread crest to the next (14.29 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 M4 heads take PH2 for Phillips and T20 for Torx, and a 3 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 M4 is about 2.0-3.0 N·m into metal threads and 0.8-1.4 N·m into plastic bosses; snug it up and stop.
Common mix-ups with M4
- 'Semus' in the Kern manual is a brand/head-style qualifier on the screw, not a separate thread designation — the metric callout is still plainly M4.
- Not all telescope/finder hardware is metric — Celestron Edge/NexStar SE finder-shoe and dovetail screws are reported as 8/32 (imperial UNC), so metric M4/M5 fitments cannot be assumed across all Celestron products; must check per accessory/vintage.
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Devices whose records share a thread with SkyWatcher-style finderscope shoe/bracket, closest length match first.
- SkyWatcher-style finderscope bracket shoe (2-hole) also M4
- Smart lock interior module also M4
- Ring video doorbell mounting hardware also M4
- WatchGas Tox Point 1000 gas detector transmitter also M4
- Tablet / POS dock mounts also M4
- Samsung washing machine panels also M4
- Panasonic TC-L42D30 also M4
- Gaggia Grinder MDF55 (commercial coffee grinder) also M4
Questions about SkyWatcher-style finderscope shoe/bracket screws
- What size screw does SkyWatcher-style finderscope shoe/bracket use?
- M4 for finderscope bracket shoe explicitly sold with M4 mounting screws.
- How long are the screws in SkyWatcher-style finderscope shoe/bracket?
- 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 M4 screw?
- 0.7 mm (coarse), which is the standard pitch for M4 machine screws; a 0.5 mm fine pitch exists but is uncommon. The tap drill is 3.3 mm and the normal clearance hole is 4.5 mm.
- What screwdriver do I need for SkyWatcher-style finderscope shoe/bracket?
- The sources do not name the drive. For M4, Phillips heads normally take PH2 and Torx heads T20; socket heads take a 3 mm hex key.
- Can I use an imperial screw instead of M4?
- No. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same. Use a true M4 screw so it does not cross-thread or strip the hole.