M3 Standoffs
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About M3 Standoffs
M3 hex standoffs for circuit board and panel mounting, in brass, nylon 6/6 and stainless steel 304. Lengths from 5–25 mm, male-female and female-female.
M3 in numbers
| Thread | M3 × 0.5 mm coarse |
| Across flats | 5.5 mm |
| Body lengths | 5–25 mm |
| Configurations | male-female, female-female |
Length is the body length measured across the hex. On a male-female standoff the stud is additional and stated separately on each listing — it is not included in the quoted length.
Choosing the material
Nylon 6/6 isolates: no ground path, nothing to short a nearby trace, but it creeps under sustained load and strips at a fraction of the torque metal takes. Brass conducts and can carry the board's ground to the chassis deliberately. Stainless is the structural choice where the stack has to carry weight.
Thread warning
#4-40 is the closest imperial size and will not fit. The diameters sit within a couple of tenths of a millimetre of each other, and the wrong screw will start, bind after a turn, and strip the standoff rather than itself. Check the pitch before you assemble.