Klipper toolhead PCBs (Voron/BTT boards) screw size
M2.5 · 5 to 8 mm long
The screws used on Klipper toolhead PCBs (Voron/BTT boards) are M2.5 in lengths from 5 to 8 mm.
The record covers PCB-to-mount standoff screws.
This entry is marked reported and comes from Voron StealthBurner Assembly Manual toolhead PCB section.
An M2.5 screw is 2.5 mm in diameter with a 0.45 mm pitch, tapped with a 2.05 mm drill; 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.
Klipper toolhead PCBs (Voron/BTT boards) 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 | 5–8 mm | 0.45 mm | not stated | not stated | PCB-to-mount standoff screws | Reported |
Fitment records and sources
PCB-to-mount standoff screws
pitch 0.45 mm · tap 2.05 mm · clearance 2.9 mm · PH1 / Torx T8
Source: Voron StealthBurner Assembly Manual toolhead PCB section
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 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 records span 5–8 mm, which means different positions take different lengths — match each hole to its own screw.
- Driver: the source does not name the drive. Standard 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.
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.
-
M2.5 x 5mm Screws Compatible with Dell XPS 14 9440 Display Assembly 10-Pack
$4.99 -
M2.5 x 5mm Phillips Wafer Head Screw for Action Camera Protective Housing - Pack of 50 Black
$4.79 each · min. 2
-
M2.5 x 6mm Laptop Motherboard Replacement Screws Wafer Head 10-Pack Black
$4.99 -
10x M2.5 x 6mm Phillips Screws for Lenovo ThinkPad X131e Chromebook LCD Hinge
$4.99
-
M2.5 x 8mm Screws for Retevis RT27 Radio Belt Clip 10-Pack Black Phillips
$4.99 -
M2.5 x 8mm Screws for Raspberry Pi 5 Case and PoE HAT 10-Pack Black
$4.99 -
25x M2.5 x 8mm Phillips Screws for Acer Nitro 5 LCD Hinge Assembly
$5.99 -
M2.5 x 8mm Black Wafer Head Screws for Lenovo ThinkPad X131e Chromebook Palmrest Replacement – 10-Pack Black
$4.99Choose size
More in 3D Printing, CNC & Robotics
2020 extrusion T-nuts (light duty)2020 extrusion T-nuts (standard)2020 T-slot hammer head bolts2020/2040 extrusion end tap2040 extrusion T-nuts3030 extrusion T-nuts (heavy duty)3030/4040 extrusion end tap3D printer & CNC enclosures3D printer hotend to X-carriageActobotics servo horn / hubArduino Mega 2560 mounting holesArduino shield stacking standoffs
Browse all 149 in 3D Printing, CNC & Robotics →The same screw also fits
Devices whose records share a thread with Klipper toolhead PCBs (Voron/BTT boards), closest length match first.
- NVIDIA Jetson Orin Nano / Xavier NX carrier also M2.5 × 5–8 mm
- Voron StealthBurner toolhead with Dragon hotend also M2.5 × 8 mm
- micro:bit enclosure mounting also M2.5 × 5–6 mm
- NVIDIA Jetson Nano carrier board also M2.5 × 6–8 mm
- Raspberry Pi Zero mounting holes also M2.5 × 5–6 mm
- Raspberry Pi HAT standoffs also M2.5 × 6–8 mm
- Raspberry Pi nylon standoff packs also M2.5 × 6 mm
- PCB standoffs for compact electronics also M2.5 × 5–8 mm
Questions about Klipper toolhead PCBs (Voron/BTT boards) screws
- What size screw does Klipper toolhead PCBs (Voron/BTT boards) use?
- M2.5 × 5–8 mm for PCB-to-mount standoff screws.
- How long are the screws in Klipper toolhead PCBs (Voron/BTT boards)?
- The records range from 5 to 8 mm depending on the position, so match each screw to its own hole.
- 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 Klipper toolhead PCBs (Voron/BTT boards)?
- 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 Klipper toolhead PCBs (Voron/BTT boards)?
- TechSpareWarehouse (our own store) lists M2.5 x 5mm, M2.5 x 6mm and M2.5 x 8mm, which match lengths in the records above.