Kolm Engines EZ77V4 model aircraft engine screw size
M4 · 30 to 50 mm long
The screws used on Kolm Engines EZ77V4 model aircraft engine are M4 in lengths from 30 to 50 mm.
It is listed for manual: mount engine to firewall with 4 M4 bolts, standoffs 30-50mm, 6-8mm min thread engagement.
This entry is marked confirmed and comes from kolmengines.com.
M4 means a 4 mm nominal diameter with a 0.7 mm thread pitch. Imperial look-alike: #8-32 (4.17 mm) — the standard US PC/rack screw, close but not the same.
Kolm Engines EZ77V4 model aircraft engine 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 | 30–50 mm | 0.7 mm | not stated | not stated | Manual: mount engine to firewall with 4 M4 bolts, standoffs 30-50mm, 6-8mm min thread engagement | Confirmed |
Fitment records and sources
Manual: mount engine to firewall with 4 M4 bolts, standoffs 30-50mm, 6-8mm min thread engagement
pitch 0.7 mm · tap 3.3 mm · clearance 4.5 mm · PH2 / Torx T20
How to check the screw before you buy
- Vibration loosens small screws on drones and RC models, so builders commonly add a drop of medium (blue) threadlocker on metal-to-metal joints — never on plastic.
- 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.
- The records span 30–50 mm, which means different positions take different lengths — match each hole to its own screw.
- 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
- M4 and 6-32 UNC share a nominal diameter with different pitch — a classic cross-thread in US-market kits.
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Questions about Kolm Engines EZ77V4 model aircraft engine screws
- What size screw does Kolm Engines EZ77V4 model aircraft engine use?
- M4 × 30–50 mm for manual: mount engine to firewall with 4 M4 bolts, standoffs 30-50mm, 6-8mm min thread engagement.
- How long are the screws in Kolm Engines EZ77V4 model aircraft engine?
- The records range from 30 to 50 mm depending on the position, so match each screw to its own hole.
- 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 Kolm Engines EZ77V4 model aircraft engine?
- 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.