What size screw does Arduino / PCB standoffs use?

M1.6 × 3–8 mm for general electronics assembly and DIY project boards.

How long are the screws in Arduino / PCB standoffs?

The records range from 3 to 8 mm depending on the position, so match each screw to its own hole.

What is the thread pitch of an M1.6 screw?

0.35 mm (coarse), which is the standard pitch for M1.6 machine screws; a 0.2 mm fine pitch exists but is uncommon. The tap drill is 1.25 mm and the normal clearance hole is 1.8 mm.

What screwdriver do I need for Arduino / PCB standoffs?

The sources do not name the drive. For M1.6, Phillips heads normally take PH00 and Torx heads T4–T5; socket heads take a 1.5 mm hex key.

Can I use an imperial screw instead of M1.6?

No. Imperial look-alike: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent. Use a true M1.6 screw so it does not cross-thread or strip the hole.

Where can I buy replacement screws for Arduino / PCB standoffs?

TechSpareWarehouse (our own store) lists M1.6 x 3mm and M1.6 x 4mm, which match lengths in the records above.

Arduino / PCB standoffs screw size

M1.6 · 3 to 8 mm long

The screws used on Arduino / PCB standoffs are M1.6 in lengths from 3 to 8 mm.

Where it is used: general electronics assembly and DIY project boards.

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

An M1.6 screw is 1.6 mm in diameter with a 0.35 mm pitch, tapped with a 1.25 mm drill; imperial look-alike: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent.

Arduino / PCB standoffs 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
M1.6	3–8 mm	0.35 mm	not stated	not stated	general electronics assembly and DIY project boards	Confirmed

Fitment records and sources

M1.63-8mmconfirmed

general electronics assembly and DIY project boards

pitch 0.35 mm · tap 1.25 mm · clearance 1.8 mm · PH00 / Torx T4–T5

Source

How to check the screw before you buy

Board standoffs and enclosure bosses set the usable length: the screw should clamp the board without bottoming in the standoff.
Diameter: across the threads an M1.6 screw measures about 1.6 mm with calipers (usually a hair under). If yours measures noticeably more or less, it is a different thread.
Pitch: 0.35 mm from one thread crest to the next (28.57 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 3–8 mm, which means different positions take different lengths — match each hole to its own screw.
Driver: the source does not name the drive. Standard M1.6 heads take PH00 for Phillips and T4–T5 for Torx, and a 1.5 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 M1.6 is about 12-20 N·cm into metal threads and 6-10 N·cm into plastic bosses; snug it up and stop.

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 Arduino / PCB standoffs, closest length match first.

Dell XPS 15 L521X also M1.6 × 3 mm
Dell Latitude 7424 also M1.6 × 3 mm
HP OmniBook X Flip 14 inch 2-in-1 14-kb0000 also M1.6 × 3 mm
MacBook Air 13-inch 2017 (A1466) logic board / I/O board screw also M1.6 × 3.3 mm
Dell 14 Premium DA14250 also M1.6 × 3 mm
DIN 965 / ISO 7046 countersunk Phillips screw also M1.6 × 3–8 mm
Dell Latitude 7285 2-in-1 also M1.6 × 4 mm
Lenovo ThinkPad 770Z also M1.6 × 4 mm

Questions about Arduino / PCB standoffs screws

What size screw does Arduino / PCB standoffs use?: M1.6 × 3–8 mm for general electronics assembly and DIY project boards.
How long are the screws in Arduino / PCB standoffs?: The records range from 3 to 8 mm depending on the position, so match each screw to its own hole.
What is the thread pitch of an M1.6 screw?: 0.35 mm (coarse), which is the standard pitch for M1.6 machine screws; a 0.2 mm fine pitch exists but is uncommon. The tap drill is 1.25 mm and the normal clearance hole is 1.8 mm.
What screwdriver do I need for Arduino / PCB standoffs?: The sources do not name the drive. For M1.6, Phillips heads normally take PH00 and Torx heads T4–T5; socket heads take a 1.5 mm hex key.
Can I use an imperial screw instead of M1.6?: No. Imperial look-alike: #1-72 UNF (1.85 mm) is larger; there is no true imperial equivalent. Use a true M1.6 screw so it does not cross-thread or strip the hole.
Where can I buy replacement screws for Arduino / PCB standoffs?: TechSpareWarehouse (our own store) lists M1.6 x 3mm and M1.6 x 4mm, which match lengths in the records above.

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