standoffs, tiny m3 long wood screws, or something for fixing pcb to wood breadboards?

Discussion in 'General Electronics Chat' started by Hamlet, Dec 21, 2015.

  1. Hamlet

    Thread Starter Member

    Jun 10, 2015
    I am stumped!

    I build my projects on wood breadboards. Sometimes, I need to affix a pcb circuit
    to the plywood/oak plank that forms the base of my project. I've used various
    creative tricks in the past, from double sided foam tape, epoxy putty, saw kerfs
    into the plywood, etc., but I am fed up with clunky solutions.

    I would use some nice brass 30mm standoffs, either M2 or M3, but they don't
    self tap very well into plywood, and the threads aren't deep enough, or quite
    aggressive enough to bite into the plywood. I could use nails with a short
    length of nylon tubing sleeve, but then I'd need a claw hammer to remove
    the pcb from the plywood.

    I often use drywall screws, 2" & 3" lengths, with a shorter nylon bushing made from
    tubing, for holding large componets like transformers, but drywall screws are much
    too large for pcb.

    If I could find some long, yet tiny wood screws, I could use those with nylon
    tubing to fasten down the pcb to the plywood.

    What would you do?
  2. #12


    Nov 30, 2010
    In my opinion, every tapered thread into wood is a clunky solution. My preference is to drill through the wood and use machine thread bolts which go into each end of the standoff spacer.
    bwilliams60 and spinnaker like this.
  3. bwilliams60

    Active Member

    Nov 18, 2012
    My son is a cabinetmaker by trade and I can tell you from experience that #12 has hit the nail on the head (pardon the pun). Plywood is a layered softwood and does not hold screws well unless you get into the more exotic Russian plywoods and multilayered or laminated woods. Drilling through and using stand-offs would be your best bet.
  4. GopherT

    AAC Fanatic!

    Nov 23, 2012
    They are called inserts. The m3 machine screw threads into the insert. The insert taps into wood nicely. Plastics are also molded over similar inserts in some products.
  5. Hamlet

    Thread Starter Member

    Jun 10, 2015
    So the idea is to drill four 3.5mm diameter holes into my 3/4 inch plywood,
    spaced, uh, using identical pcb, marking the corners...

    Then I use 1" M3 machine screws up thru the base, into my brass doubled
    tapped hex standoffs, then use short M3 machine screws to mount the pcb
    to the brass standoffs?

    Sounds like I need a drill press.
  6. umphrey


    Dec 1, 2012
  7. BReeves


    Nov 24, 2012