Celestron EdgeHD 9.25" OTA secondary mirror collimation screws screw size
M3 · 10 mm long
The screws used on Celestron EdgeHD 9.25" OTA secondary mirror collimation screws are M3, 10 mm long.
The record covers official Celestron reference lists M3 x 0.5, 10mm collimation screws for the 9.25" EdgeHD tube.
This entry is marked confirmed and comes from celestron.com.
An M3 screw is 3 mm in diameter with a 0.5 mm pitch, tapped with a 2.5 mm drill; imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Celestron EdgeHD 9.25" OTA secondary mirror collimation 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 |
|---|---|---|---|---|---|---|
| M3 | 10 mm | 0.5 mm | not stated | not stated | Official Celestron reference lists M3 x 0.5, 10mm collimation screws for the 9.25" EdgeHD tube | Confirmed |
Fitment records and sources
Official Celestron reference lists M3 x 0.5, 10mm collimation screws for the 9.25" EdgeHD tube.
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
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 M3 screw measures about 3 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
- Pitch: 0.5 mm from one thread crest to the next (20 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 record states 10 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
- Driver: the source does not name the drive. Standard M3 heads take PH1 for Phillips and T10 for Torx, and a 2.5 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 M3 is about 80-130 N·cm into metal threads and 35-60 N·cm into plastic bosses; snug it up and stop.
Common mix-ups with M3
- The bioprinter M3 reference is a tube-connector thread spec, not a structural chassis screw; verify before assuming interchangeability with fastener screws.
- Suunto dive computer service manuals reference strap pins and battery compartment springs but do not explicitly cite a metric screw thread size in the sections reviewed; do not infer M2/M2.5 fitment for Suunto dive computer straps without direct confirmation.
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.
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M3 x 10mm Phillips Wafer Head Screw for Sim Racing Wheel Paddle Shifter - Single Replacement Black
$0.10 each · min. 50
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M3 x 10mm Phillips Wafer Head Screw for RC Car/Truck Chassis Mount - Single Replacement Black
$0.10 each · min. 50
-
M3 x 10mm Phillips Wafer Head Screw for 3D Printer Frame Assembly - Single Replacement Black
$0.10 each · min. 50
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Browse all 278 in Cameras & Optics →The same screw also fits
Devices whose records share a thread with Celestron EdgeHD 9.25" OTA secondary mirror collimation screws, closest length match first.
- Rucker Machine Tall 10/22 optics mount also M3 × 10 mm
- Refrigerator light cover and shelf clips also M3 × 10 mm
- Wooden Camera Pocket Cage 168800 (Blackmagic Pocket Cinema) also M3 × 10 mm
- Partizan / Pilotix PT10 V3 FPV frame also M3 × 10 mm
- Microscope objective turret and stage also M3 × 10 mm
- Olympus BH-2 microscope frame also M3 × 10 mm
- Celestron C9.25 Schmidt-Cassegrain OTA secondary mirror collimation screws also M3 × 10 mm
- Airsoft red dot sight mounting screw set (Laylax/Quintes Sence) also M3 × 10 mm
Questions about Celestron EdgeHD 9.25" OTA secondary mirror collimation screws screws
- What size screw does Celestron EdgeHD 9.25" OTA secondary mirror collimation screws use?
- M3 × 10 mm for official Celestron reference lists M3 x 0.5, 10mm collimation screws for the 9.25" EdgeHD tube.
- How long are the screws in Celestron EdgeHD 9.25" OTA secondary mirror collimation screws?
- The record gives 10 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
- What is the thread pitch of an M3 screw?
- 0.5 mm (coarse), which is the standard pitch for M3 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.5 mm and the normal clearance hole is 3.4 mm.
- What screwdriver do I need for Celestron EdgeHD 9.25" OTA secondary mirror collimation screws?
- The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take a 2.5 mm hex key.
- Can I use an imperial screw instead of M3?
- No. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3. Use a true M3 screw so it does not cross-thread or strip the hole.
- Where can I buy replacement screws for Celestron EdgeHD 9.25" OTA secondary mirror collimation screws?
- TechSpareWarehouse (our own store) lists M3 x 10mm, which matches the length in the records above.