How long are the screws in Tetra 3 FPV drone frame (sub-250g toothpick/whoop class)?

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 M1.4 screw?

0.3 mm (coarse), which is the standard pitch for M1.4 machine screws. The tap drill is 1.1 mm and the normal clearance hole is 1.6 mm.

What screwdriver do I need for Tetra 3 FPV drone frame (sub-250g toothpick/whoop class)?

The sources do not name the drive. For M1.4, Phillips heads normally take PH000 / PH00 and Torx heads T2–T3; socket heads take a 1.3 mm hex key.

Can I use an imperial screw instead of M1.4?

No. Imperial look-alike: #0-80 UNF (1.52 mm) — close in diameter, different pitch, do not mix. Use a true M1.4 screw so it does not cross-thread or strip the hole.

Tetra 3 FPV drone frame (sub-250g toothpick/whoop class) screw size

M1.4 · length not stated in the sources

The screws used on Tetra 3 FPV drone frame (sub-250g toothpick/whoop class) are M1.4. None of the sources we found gives an exact length, so measure the original before you order.

Where it is used: carbon fiber frame explicitly built with M1.4 hardware for arm/motor mounting.

This entry is marked confirmed and comes from rotorbuilds.com.

For reference, M1.4 is 1.4 mm across the threads at 0.3 mm pitch. The imperial size people confuse it with: #0-80 UNF (1.52 mm) — close in diameter, different pitch, do not mix.

Tetra 3 FPV drone frame (sub-250g toothpick/whoop class) 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
M1.4	not stated	0.3 mm	not stated	not stated	Carbon fiber frame explicitly built with M1.4 hardware for arm/motor mounting	Confirmed

Fitment records and sources

M1.4M1.4confirmed

Carbon fiber frame explicitly built with M1.4 hardware for arm/motor mounting

pitch 0.3 mm · tap 1.1 mm · clearance 1.6 mm · PH000 / PH00 / Torx T2–T3

Source

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 M1.4 screw measures about 1.4 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
Pitch: 0.3 mm from one thread crest to the next (33.33 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 M1.4 heads take PH000 / PH00 for Phillips and T2–T3 for Torx, and a 1.3 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 M1.4 is about 8-12 N·cm into metal threads and 4-7 N·cm into plastic bosses; snug it up and stop.

Common mix-ups with M1.4

Whoop motor screws differ between M1.4x3mm and M1.6x4mm across BetaFPV/NewBeeDrone product generations — check the exact model.
Whoop drone M1.4 comes in steel, PEEK and RENY versions: plastic ones are for cameras, not structural frame use.

Pitch gauge · Screw size finder · Torque guide

Buy these screws at TechSpare Warehouse

In stock and shipped from South Carolina. Our black screws are Phillips wafer head (low profile); match the head style and length to the original before you order.

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The same screw also fits

Devices whose records share a thread with Tetra 3 FPV drone frame (sub-250g toothpick/whoop class), closest length match first.

FPV flight-controller / ESC stacks also M1.4
BetaFPV Meteor/Cetus whoop motor screws also M1.4
RC micro servo horn (SCX24 / 1/24 scale micro crawler) also M1.4
MTH model train part also M1.4
Marklin model train part also M1.4
Micro RC helicopters also M1.4
DJI Mini 3 / Mini 3 Pro / Mini 4 Pro propellers also M1.4
BETAFPV Meteor / Air / Cetus whoops also M1.4

Questions about Tetra 3 FPV drone frame (sub-250g toothpick/whoop class) screws

What size screw does Tetra 3 FPV drone frame (sub-250g toothpick/whoop class) use?: M1.4 for carbon fiber frame explicitly built with M1.4 hardware for arm/motor mounting.
How long are the screws in Tetra 3 FPV drone frame (sub-250g toothpick/whoop class)?: 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 M1.4 screw?: 0.3 mm (coarse), which is the standard pitch for M1.4 machine screws. The tap drill is 1.1 mm and the normal clearance hole is 1.6 mm.
What screwdriver do I need for Tetra 3 FPV drone frame (sub-250g toothpick/whoop class)?: The sources do not name the drive. For M1.4, Phillips heads normally take PH000 / PH00 and Torx heads T2–T3; socket heads take a 1.3 mm hex key.
Can I use an imperial screw instead of M1.4?: No. Imperial look-alike: #0-80 UNF (1.52 mm) — close in diameter, different pitch, do not mix. Use a true M1.4 screw so it does not cross-thread or strip the hole.

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