8215-A-0440 | فواصل سداسية Amatom #4-40 × 1/2 بوصة | ألومنيوم (100 / عبوة)

The threads were perfectly clean and consistent on all 100 pieces, so my panel mounting went smoothly with no cross-threading issues. The aluminum finish is just right for basic circuit board spacing without adding unnecessary weight.

Used these to mount a control board inside a small chassis, and the aluminum is light but feels sturdy enough. The 100-pack is great to have on hand for future projects, too.

The hex shape grips a wrench perfectly without stripping, even when I’m torquing them into aluminum panels. I’ve already used forty of them mounting two PCB stacks and the 1/2" length gives just enough clearance for the wiring underneath.