What size screw does Futaba / Robbe servo horn mounting screws use?

M2.5 × 6 mm for servo horn mounting screw set listed as M2.5x6.

How long are the screws in Futaba / Robbe servo horn mounting screws?

The record gives 6 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.

What is the thread pitch of an M2.5 screw?

0.45 mm (coarse), which is the standard pitch for M2.5 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.05 mm and the normal clearance hole is 2.9 mm.

What screwdriver do I need for Futaba / Robbe servo horn mounting screws?

The sources do not name the drive. For M2.5, Phillips heads normally take PH1 and Torx heads T8; socket heads take a 2 mm hex key.

Can I use an imperial screw instead of M2.5?

No. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in. Use a true M2.5 screw so it does not cross-thread or strip the hole.

Where can I buy replacement screws for Futaba / Robbe servo horn mounting screws?

TechSpareWarehouse (our own store) lists M2.5 x 6mm, which matches the length in the records above.

Futaba / Robbe servo horn mounting screws screw size

M2.5 · 6 mm long

Our records put Futaba / Robbe servo horn mounting screws on M2.5 screws, 6 mm long.

Where it is used: servo horn mounting screw set listed as M2.5x6.

This entry is marked confirmed and comes from rc-car-online.de.

For reference, M2.5 is 2.5 mm across the threads at 0.45 mm pitch. The imperial size people confuse it with: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in.

Futaba / Robbe servo horn mounting screws 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
M2.5	6 mm	0.45 mm	not stated	not stated	Servo horn mounting screw set listed as M2.5x6	Confirmed

Fitment records and sources

M2.56confirmed

Servo horn mounting screw set listed as M2.5x6

pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8

Source

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 M2.5 screw measures about 2.5 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
Pitch: 0.45 mm from one thread crest to the next (22.22 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 record states 6 mm. Going longer risks bottoming out or touching parts behind the hole; going shorter loses thread engagement.
Driver: the source does not name the drive. Standard M2.5 heads take PH1 for Phillips and T8 for Torx, and a 2 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 M2.5 is about 45-70 N·cm into metal threads and 20-35 N·cm into plastic bosses; snug it up and stop.

Common mix-ups with M2.5

M2.5 pitch is 0.45mm vs M3's 0.5mm and M2's 0.4mm — forcing the wrong one strips plastic bosses instantly.
M2.5 and M3 look the same to the naked eye — you need calipers on the shank to tell them apart.

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 Futaba / Robbe servo horn mounting screws, closest length match first.

Xbox One S/X controller PCB standoffs also M2.5 × 6 mm
Holybro X500 V2 with Pixhawk 6C also M2.5 × 6 mm
Raspberry Pi (Model B+ through Pi 4/Pi 5 form factor boards) also M2.5 × 6 mm
Drone remote controller internals also M2.5 × 6 mm
Model aircraft control horns also M2.5 × 6 mm
Sewing machine needle plate also M2.5 × 6 mm
PowerVision PowerRay underwater drone also M2.5 × 6 mm
Antique wall clock pendulum brackets also M2.5 × 6 mm

Questions about Futaba / Robbe servo horn mounting screws screws

What size screw does Futaba / Robbe servo horn mounting screws use?: M2.5 × 6 mm for servo horn mounting screw set listed as M2.5x6.
How long are the screws in Futaba / Robbe servo horn mounting screws?: The record gives 6 mm. Measure the original from under the head (overall for a countersunk head) to confirm before ordering.
What is the thread pitch of an M2.5 screw?: 0.45 mm (coarse), which is the standard pitch for M2.5 machine screws; a 0.35 mm fine pitch exists but is uncommon. The tap drill is 2.05 mm and the normal clearance hole is 2.9 mm.
What screwdriver do I need for Futaba / Robbe servo horn mounting screws?: The sources do not name the drive. For M2.5, Phillips heads normally take PH1 and Torx heads T8; socket heads take a 2 mm hex key.
Can I use an imperial screw instead of M2.5?: No. Imperial look-alike: #3-48 / #4-40 (2.51 / 2.84 mm) — #4-40 is the common US stand-in and it will NOT thread in. Use a true M2.5 screw so it does not cross-thread or strip the hole.
Where can I buy replacement screws for Futaba / Robbe servo horn mounting screws?: TechSpareWarehouse (our own store) lists M2.5 x 6mm, which matches the length in the records above.

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