Model engineering glass oiler / oil cup connection thread (steam engines, Stirling engines) screw size
M3 · length not stated in the sources
Our records put Model engineering glass oiler / oil cup connection thread (steam engines, Stirling engines) on M3 screws. None of the sources we found gives an exact length, so measure the original before you order.
It is listed for 'Oil cup made of brass with M3 or M4 connection thread... Dimensions of glass oiler 6mm ... Connection thread: M3'.
This entry is marked confirmed and comes from bengs-modellbau.de.
M3 means a 3 mm nominal diameter with a 0.5 mm thread pitch. Imperial look-alike: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.
Model engineering glass oiler / oil cup connection thread (steam engines, Stirling engines) 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 | not stated | 0.5 mm | not stated | not stated | 'Oil cup made of brass with M3 or M4 connection thread... Dimensions of glass oiler 6mm ... Connection thread: M3' | Confirmed |
Fitment records and sources
'Oil cup made of brass with M3 or M4 connection thread... Dimensions of glass oiler 6mm ... Connection thread: M3'
pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10
How to check the screw before you buy
- Frame and motor screws must not reach the motor windings; check the length against the motor's mounting depth.
- 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.
- 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
- US-made guitar bridges use #4/#6 imperial intonation screws while imported bridges use M3 — the wrong one strips the saddle.
- 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.
More in Drones, RC & Gimbals
The same screw also fits
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- Drone frame arms also M3
- FPV flight controller stack screws (12.9 hex socket cap) also M3
- Pinball playfield insert hardware (metric) also M3
- HP LaserJet family common hardware also M3
- DJI Phantom 2 landing gear/support stand mounting screw also M3
- FlyingTech anti-vibration soft mount kit also M3
Questions about Model engineering glass oiler / oil cup connection thread (steam engines, Stirling engines) screws
- What size screw does Model engineering glass oiler / oil cup connection thread (steam engines, Stirling engines) use?
- M3 for 'Oil cup made of brass with M3 or M4 connection thread... Dimensions of glass oiler 6mm ... Connection thread: M3'.
- How long are the screws in Model engineering glass oiler / oil cup connection thread (steam engines, Stirling engines)?
- 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 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 Model engineering glass oiler / oil cup connection thread (steam engines, Stirling engines)?
- 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.