What size screw does OpenBeam / MakerBeam 15x15 mm extrusion use?

M3 × 6 mm for T-slot fastener bolts for 10x10 and 15x15 mm beam.

How long are the screws in OpenBeam / MakerBeam 15x15 mm extrusion?

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 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 OpenBeam / MakerBeam 15x15 mm extrusion?

The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take 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.

Where can I buy replacement screws for OpenBeam / MakerBeam 15x15 mm extrusion?

TechSpareWarehouse (our own store) lists M3 x 6mm, which matches the length in the records above.

OpenBeam / MakerBeam 15x15 mm extrusion screw size

M3 · 6 mm long

The screws used on OpenBeam / MakerBeam 15x15 mm extrusion are M3, 6 mm long.

Where it is used: T-slot fastener bolts for 10x10 and 15x15 mm beam.

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

For reference, M3 is 3 mm across the threads at 0.5 mm pitch. The imperial size people confuse it with: #5-40 (3.18 mm) or #4-40 — neither interchanges with M3.

OpenBeam / MakerBeam 15x15 mm extrusion 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	6 mm	0.5 mm	not stated	not stated	T-slot fastener bolts for 10x10 and 15x15 mm beam	Confirmed

Fitment records and sources

M36 mm and longerconfirmed

T-slot fastener bolts for 10x10 and 15x15 mm beam

pitch 0.5 mm · tap 2.5 mm · clearance 3.4 mm · PH1 / Torx T10

Source

How to check the screw before you buy

Printer and CNC builds usually publish a bill of materials; when it lists a length, follow it, since extrusion T-nuts and motor faces have fixed thread depths.
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: 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 M3 heads take PH1 for Phillips and T10 for Torx, and a 2.5 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 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

2020 extrusion T-nuts come in M3/M4/M5 and are not interchangeable — M3 is accessory-only, M5 is structural.
The bioprinter M3 reference is a tube-connector thread spec, not a structural chassis screw; verify before assuming interchangeability with fastener screws.

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 OpenBeam / MakerBeam 15x15 mm extrusion, closest length match first.

Voron 2.4 electronics bay also M3 × 6 mm
ESP32 DevKit boards also M3 × 6 mm
Ender 3 V2 hotend and hotend cover also M3 × 6 mm
Arduino Mega 2560 mounting holes also M3 × 6 mm
NEMA 23 stepper motor, 3A variant also M3 × 6 mm
Arduino Uno / Mega mounting holes also M3 × 6 mm
Arduino Uno / shield mounting holes also M3 × 6 mm
Carbide3D Shapeoko 5 Pro CNC router also M3 × 6 mm

Questions about OpenBeam / MakerBeam 15x15 mm extrusion screws

What size screw does OpenBeam / MakerBeam 15x15 mm extrusion use?: M3 × 6 mm for T-slot fastener bolts for 10x10 and 15x15 mm beam.
How long are the screws in OpenBeam / MakerBeam 15x15 mm extrusion?: 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 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 OpenBeam / MakerBeam 15x15 mm extrusion?: The sources do not name the drive. For M3, Phillips heads normally take PH1 and Torx heads T10; socket heads take 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.
Where can I buy replacement screws for OpenBeam / MakerBeam 15x15 mm extrusion?: TechSpareWarehouse (our own store) lists M3 x 6mm, which matches the length in the records above.

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