OpenFlexure Delta Stage screw size
M3 · 6 to 25 mm long
The screws used on OpenFlexure Delta Stage are M3 in lengths from 6 to 25 mm.
There are 4 separate fitment records for it, including 3x M3x8mm screws in the official bill of materials (M3), 2x M3x6mm screws in the official bill of materials (M3) and 3x M3x25mm hex head screws (M3), plus 1 more in the table below.
4 of the 4 records are marked confirmed, drawn from 1 source (build.openflexure.org).
For reference, M3 is 3 mm across the threads at 0.5 mm pitch. The imperial size people confuse it with: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
OpenFlexure Delta Stage 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 | 8 mm | 0.5 mm | not stated | not stated | 3x M3x8mm screws in the official bill of materials | Confirmed |
| M3 | 6 mm | 0.5 mm | not stated | not stated | 2x M3x6mm screws in the official bill of materials | Confirmed |
| M3 | 25 mm | 0.5 mm | not stated | not stated | 3x M3x25mm hex head screws | Confirmed |
| M3 | 12 mm | 0.5 mm | not stated | not stated | 3x M3x12mm screws plus M3 nuts and washerswasher / flange face | Confirmed |
Fitment records and sources
3x M3x8mm screws in the official bill of materials
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
2x M3x6mm screws in the official bill of materials
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
3x M3x25mm hex head screws
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
3x M3x12mm screws plus M3 nuts and washers
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 records span 6–25 mm, which means different positions take different lengths — match each hole to its own screw.
- 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
- 2020 extrusion T-nuts come in M3/M4/M5 and are not interchangeable — M3 is accessory-only, M5 is structural.
- M3 (3.0mm, 0.5mm pitch) is not #6-32 UNC (~3.5mm) — they look identical and cross-thread, the single most common PC-building mistake.
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.
-
M3 x 8mm Screws for Leather Spike Attachments Guitar Straps 10-Pack
$4.99 -
M3 x 8mm Phillips Wafer Head Screw for SLA Resin 3D Printer VAT Film - Single Replacement Black
$0.10 each · min. 50
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M3 x 6mm Replacement Screws for XLR Audio Connectors Phillips Wafer Head 50-Pack
$4.99 -
M3 x 6mm Phillips Wafer Head Carbon Steel Machine Screws for XLR Audio Connectors | 50-Pack (Black)
$4.99
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M3 x 12mm Phillips Wafer Head Screw for Camera Cage & Battery Slide Mount - Pack of 50 Black
$6.49 -
M3 x 12mm Phillips Wafer Head Screw for Electric Scooter LCD Dashboard - Single Replacement Black
$0.10 each · min. 50
-
M3 x 8mm Phillips Flat Head Countersunk Machine Screws Zinc Silver 100-Pack for RC & 3D Printers
$9.99 -
M3 x 8mm Phillips Flat Head Countersunk Machine Screws Zinc Silver 10-Pack for RC & 3D Printers
$4.99
More in Cameras & Optics
The same screw also fits
Devices whose records share a thread with OpenFlexure Delta Stage, closest length match first.
- Glock MOS optic-to-plate mounting screw also M3 × 6 mm
- Vintage camera / electronics faceplates also M3 × 8 mm
- Vivotek IT9389-H / IT9389-HT dome camera also M3 × 8 mm
- OpenFlexure Microscope AMS translation stage also M3 × 8 mm
- Airsoft/firearm red-dot sight optic mounting screws (Vortex Viper, Swampfox patterns) also M3 × 8 mm
- Refrigerator light cover and shelf clips also M3 × 8 mm
- Glock MOS cover plate screw also M3 × 8 mm
- Aimpoint SM-2001/2007 Micro T1/T2 mount also M3 × 6 mm
Questions about OpenFlexure Delta Stage screws
- What size screw does OpenFlexure Delta Stage use?
- M3 × 8 mm for 3x M3x8mm screws in the official bill of materials; M3 × 6 mm for 2x M3x6mm screws in the official bill of materials; M3 × 25 mm for 3x M3x25mm hex head screws; M3 × 12 mm for 3x M3x12mm screws plus M3 nuts and washers.
- How long are the screws in OpenFlexure Delta Stage?
- The records range from 6 to 25 mm depending on the position, so match each screw to its own hole.
- 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 OpenFlexure Delta Stage?
- 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 OpenFlexure Delta Stage?
- TechSpareWarehouse (our own store) lists M3 x 8mm, M3 x 6mm and M3 x 12mm, which match lengths in the records above.