Model steam engine boiler pipe fittings (elbow/tee) screw size
M4 · length not stated in the sources
Model steam engine boiler pipe fittings (elbow/tee) takes M4 metric screws. None of the sources we found gives an exact length, so measure the original before you order.
Where it is used: 'M4*0.5 Thread Elbow Pipe Fitting for KACIO Steam Engine Boiler Model' — explicit M4 x 0.5 pitch pipe fitting thread.
This entry is marked confirmed and comes from enginediyshop.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.
Model steam engine boiler pipe fittings (elbow/tee) 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 | 'M4*0.5 Thread Elbow Pipe Fitting for KACIO Steam Engine Boiler Model' — explicit M4 x 0.5 pitch pipe fitting thread | Confirmed |
Fitment records and sources
'M4*0.5 Thread Elbow Pipe Fitting for KACIO Steam Engine Boiler Model' — explicit M4 x 0.5 pitch pipe fitting thread
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
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 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
- US-made pinball machines (Williams/Bally/Stern) overwhelmingly use imperial UTS threads (#6-32, #8-32, #10-32); explicit metric threads only appear on newer/import components such as Jersey Jack Pinball's Hobbit Smaug assembly (M3).
- Water heater elements use pipe threads (NPSM/NPT), not metric machine screws.
More in Drones, RC & Gimbals
The same screw also fits
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- DJI Agras Agras T25/T50 spray drone screw with pad also M4
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- GoPro-style action cam mount on FPV frames also M4
- European mortise lock faceplates also M4
- Model engineering oil cup / glass oiler connection thread (alternate size) also M4
- Kolm Engines EZ77V4 model aircraft engine also M4
- Berkel 330M Slicer base/transmission fastener (short) also M4
- Traxxas Spartan SR (Model 103076-4) boat also M4
Questions about Model steam engine boiler pipe fittings (elbow/tee) screws
- What size screw does Model steam engine boiler pipe fittings (elbow/tee) use?
- M4 for 'M4*0.5 Thread Elbow Pipe Fitting for KACIO Steam Engine Boiler Model' — explicit M4 x 0.5 pitch pipe fitting thread.
- How long are the screws in Model steam engine boiler pipe fittings (elbow/tee)?
- 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 Model steam engine boiler pipe fittings (elbow/tee)?
- 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.