FPV flight controller stack (generic kit) screw size
M3 · length not stated in the sources
Our records put FPV flight controller stack (generic kit) on M3 screws. None of the sources we found gives an exact length, so measure the original before you order.
The record covers M3 hex socket cap screws with anti-vibration O-rings holding FC/PDB/ESC stack.
Head and drive, as the source states them: socket cap head and Hex socket (Allen) drive.
This entry is marked confirmed and comes from flyingtech.co.uk.
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.
FPV flight controller stack (generic kit) 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 | Socket cap | Hex socket (Allen) | M3 hex socket cap screws with anti-vibration O-rings holding FC/PDB/ESC stack | Confirmed |
Fitment records and sources
M3 hex socket cap screws with anti-vibration O-rings holding FC/PDB/ESC stack
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: for socket cap screws, measure from under the head to the tip (countersunk heads are the exception: they are measured overall).
- Driver: the source names a Hex socket (Allen) drive. For comparison, standard M3 heads take PH1 (Phillips) or T10 (Torx), or a 2.5 mm hex key.
- 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
- Nylon M3 standoffs are for vibration isolation, not load-bearing frame arms.
- 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.
More in Drones, RC & Gimbals
The same screw also fits
Devices whose records share a thread with FPV flight controller stack (generic kit), closest length match first.
- RC glow/gas engine mount bolts also M3
- GetFPV anti-vibration FC standoff 7mm also M3
- FPV flight-controller / ESC stacks also M3
- E-flite Gee Bee R-2 1.0m wing securing screws also M3
- VXB flight controller anti-vibration standoffs also M3
- 3D-printed FPV stack mounts and spacers also M3
- NSR slot car axles also M3
- Futaba standard servo horn screw also M3
Questions about FPV flight controller stack (generic kit) screws
- What size screw does FPV flight controller stack (generic kit) use?
- M3 for M3 hex socket cap screws with anti-vibration O-rings holding FC/PDB/ESC stack.
- How long are the screws in FPV flight controller stack (generic kit)?
- 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 FPV flight controller stack (generic kit)?
- The source lists a Hex socket (Allen) drive. Standard M3 heads otherwise take PH1 (Phillips) or T10 (Torx), or 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.