M3x5mm Brass Standoff Spacer Female-Female (10-Pack)

Where a nylon spacer gives electrical isolation, a brass standoff instead offers genuine mechanical rigidity and precision threading - screwing directly into both the mounting surface and the board above it, holding two layers at an exact, repeatable 5mm separation rather than just resting between them. That threaded connection on both ends is what makes it suitable for stacking boards (a flight controller above a PDB, for instance) where the assembly needs to stay mechanically solid rather than just spaced apart.

The hexagonal body shape gives a wrench or pliers flat surfaces to grip during installation, preventing the standoff from spinning uselessly while a screw is driven into it - a small but genuinely useful detail missing from round-bodied alternatives. Brass construction resists corrosion better than plain steel while remaining easy to thread and re-thread without galling.

Common uses are stacking multiple PCBs at a fixed separation (flight controller stacks, Raspberry Pi HAT mounting), precision board-to-chassis mounting needing exact standoff height, and general electronics assembly wanting a threaded rather than press-fit spacing solution.