What size screw does NEMA 17 stepper motor faceplate use?

M3 × 4–8 mm for four front mounting holes, M3 x 0.5 tapped 4.5mm deep minimum.

How long are the screws in NEMA 17 stepper motor faceplate?

The records range from 4 to 8 mm depending on the position, so match each screw to its own hole.

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 NEMA 17 stepper motor faceplate?

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 NEMA 17 stepper motor faceplate?

TechSpareWarehouse (our own store) lists M3 x 4mm, M3 x 5mm and M3 x 6mm, which match lengths in the records above.

NEMA 17 stepper motor faceplate screw size

M3 · 4 to 8 mm long

Our records put NEMA 17 stepper motor faceplate on M3 screws in lengths from 4 to 8 mm.

Where it is used: four front mounting holes, M3 x 0.5 tapped 4.5mm deep minimum.

This entry is marked confirmed and comes from novanta.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.

NEMA 17 stepper motor faceplate 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	4–8 mm	0.5 mm	not stated	not stated	Four front mounting holes, M3 x 0.5 tapped 4.5mm deep minimum	Confirmed

Fitment records and sources

M34-8mmconfirmed

Four front mounting holes, M3 x 0.5 tapped 4.5mm deep minimum

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

Source

How to check the screw before you buy

Into printed plastic, the screw either self-taps or needs a heat-set insert; machine screws straight into plastic strip easily.
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 records span 4–8 mm, which means different positions take different lengths — match each hole to its own screw.
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

On FPV motors, screw length is safety-critical: one turn too long and the screw crushes the motor windings. Measure arm + base depth, and dry-fit before powering up.
NEMA 23 steppers in the 6A frame use imperial #4-40 / #2-56 threads, not M3 - check the datasheet before ordering metric.

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 NEMA 17 stepper motor faceplate, closest length match first.

MGN12 linear rail also M3 × 8 mm
2020 extrusion T-nuts (light duty) also M3 × 6–8 mm
NEMA 17 stepper motor face also M3 × 6–8 mm
OpenBuilds gantry plate brackets also M3 × 6–8 mm
VEX / Actobotics channel and gussets also M3 × 8 mm
MGN9 linear rail also M3 × 6–8 mm
Voron StealthBurner toolhead (stock hotend) also M3 × 8 mm
Voron 2.4 / Trident also M3 × 6–8 mm

Questions about NEMA 17 stepper motor faceplate screws

What size screw does NEMA 17 stepper motor faceplate use?: M3 × 4–8 mm for four front mounting holes, M3 x 0.5 tapped 4.5mm deep minimum.
How long are the screws in NEMA 17 stepper motor faceplate?: The records range from 4 to 8 mm depending on the position, so match each screw to its own hole.
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 NEMA 17 stepper motor faceplate?: 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 NEMA 17 stepper motor faceplate?: TechSpareWarehouse (our own store) lists M3 x 4mm, M3 x 5mm and M3 x 6mm, which match lengths in the records above.

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