Aurorad helical telescope focuser handle/lock screws screw size
M4 · length not stated in the sources
The screws used on Aurorad helical telescope focuser handle/lock screws are M4. None of the sources we found gives an exact length, so measure the original before you order.
The record covers 'using 2pcs M3 non-slip brass handle screws... There is 1pc M4 brass lock screw in middle part' for a 1.25in helical focuser.
This entry is marked confirmed and comes from amazon.com.
An M4 screw is 4 mm in diameter with a 0.7 mm pitch, tapped with a 3.3 mm drill; imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Aurorad helical telescope focuser handle/lock screws 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 | 'using 2pcs M3 non-slip brass handle screws... There is 1pc M4 brass lock screw in middle part' for a 1.25in helical focuser | Confirmed |
Fitment records and sources
'using 2pcs M3 non-slip brass handle screws... There is 1pc M4 brass lock screw in middle part' for a 1.25in helical focuser
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Laptop covers and brackets often mix two or three lengths of the same thread, so lay the screws out in the order they came out (a magnetic mat or a sheet of paper with the hole pattern drawn on it works).
- 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
- Smart doorbell and lock kits bundle metric machine screws with imperial wood screws in the same bag; the metric ones are rarely labelled.
- 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.
More in Laptops & PCs
The same screw also fits
Devices whose records share a thread with Aurorad helical telescope focuser handle/lock screws, closest length match first.
- Panel PC kiosk retention hardware also M4
- Hallde Blender SB-4 also M4
- Dell Inspiron 24 5475 Aio also M4
- PC radiator fan screws (Koolance/HWLabs/Swiftech) also M4
- Schneider Electric Box iPC Universal / Performance also M4
- Mini-PC VESA brackets (Intel NUC, Mac mini) also M4
- Dell Inspiron 27 7775 Aio also M4
- Beckhoff industrial PC / I/O chassis ground terminal also M4
Questions about Aurorad helical telescope focuser handle/lock screws screws
- What size screw does Aurorad helical telescope focuser handle/lock screws use?
- M4 for 'using 2pcs M3 non-slip brass handle screws... There is 1pc M4 brass lock screw in middle part' for a 1.25in helical focuser.
- How long are the screws in Aurorad helical telescope focuser handle/lock screws?
- 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 Aurorad helical telescope focuser handle/lock screws?
- 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.