Pumpkin CubeSat Kit (PC/104 stack) screw size
M3 · 25 mm long
Pumpkin CubeSat Kit (PC/104 stack) takes M3 metric screws, 25 mm long.
The record covers "25mm (1in) M3 threaded spacers are normally used between adjacent slots" in the PC/104 card stack.
This entry is marked confirmed and comes from cubesatkit.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.
Pumpkin CubeSat Kit (PC/104 stack) 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 | 25 mm | 0.5 mm | not stated | not stated | "25mm (1in) M3 threaded spacers are normally used between adjacent slots" in the PC/104 card stack | Confirmed |
Fitment records and sources
"25mm (1in) M3 threaded spacers are normally used between adjacent slots" in the PC/104 card stack
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- A screw that is even 1 mm too long in a laptop base can push into the keyboard, battery or a board trace, so match the length position by position.
- 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 25 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
- M3 is the most common FPV screw, but length must match arm and stack thickness — too long can short motor windings or crack frame plates.
- 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.
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Devices whose records share a thread with Pumpkin CubeSat Kit (PC/104 stack), closest length match first.
- PC case fan mounting (120/140mm) also M3 × 25 mm
- PC watercooling radiator fan screws also M3 × 25 mm
- PC case and radiator fan mounting also M3 × 25 mm
- PC case & radiator fans also M3 × 25 mm
- PC case fan mounting screws (aftermarket kits) also M3 × 25 mm
- DIN 965 / ISO 7046 countersunk Phillips screw also M3 × 25 mm
- Voron 2.4 3D printer also M3 × 25 mm
- OpenFlexure Delta Stage also M3 × 25 mm
Questions about Pumpkin CubeSat Kit (PC/104 stack) screws
- What size screw does Pumpkin CubeSat Kit (PC/104 stack) use?
- M3 × 25 mm for "25mm (1in) M3 threaded spacers are normally used between adjacent slots" in the PC/104 card stack.
- How long are the screws in Pumpkin CubeSat Kit (PC/104 stack)?
- The record gives 25 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 Pumpkin CubeSat Kit (PC/104 stack)?
- 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.