Standoff & stack calculator
Mounting a board on standoffs is where screw length goes wrong most often. Add up what the screw passes through, then check what is left to thread in.
Result
5.9 mm of thread goes into the standoff
The screw passes through 2.1 mm before it reaches the standoff.
Good — that will hold.
Common board figures
- Standard PCB thickness is 1.6 mm; thin boards are 1.0 mm or 0.8 mm.
- Raspberry Pi and most single-board computers use M2.5 mounting holes.
- Motherboards, drives and most enclosures use M3.
- Male-female standoffs stack, so you can build the height you need in steps.
Gear for this job
Affiliate links — they cost you nothing extra and keep this database free.
PCB standoff and spacer kit
Male-female standoffs to build any height
Nylon standoff kit
Non-conductive board mounting