Finger Nuts





Introduction: Finger Nuts

Sometimes you want something easier to grip than a “wing-nut”, but smaller than a regular threaded knob. I made these “Finger Nuts”   at the TechShop,, from ¼ in. Plexiglas using the Laser Engraver.

Step 1: Finger Nuts

Laser cut equal number of discs and nut holders.

Step 2: Finger Nuts

Depending on how many you are making, assemble the parts onto a ¼-20 bolt or suitable length of ¼-20 all-thread in the following order: nut, washer, disc, nut, nut holder, washer, disc,  nut, nut holder, washer, as many as you care to, and finish with a washer and nut. In this view the nut holder on the right side is shown not seated on the nut, yet.

Step 3: Finger Nut

Barely tighten each nut. Use a drop of water thin Plexiglas cement at each disc/nut holder joint.  The thin cement will be drawn between the disc and nut holder and weld them together. Give the cemented joints an hour or more to dry.

Step 4: Finger Nuts

Take the nuts and glued-up parts off the bolt or all-thread. Place the glued discs and nut holders, with the nut recess up. on a piece of wax paper. Put a nut in each recess and place a drop or two of medium viscosity CA glue to hold the nut in place.

Step 5: Finger Nuts

In use, the disc side goes toward the piece being held, so that the nut is trapped.



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    22 Discussions

    hi nice 'ible.
    Reading this made me think of oogoo, the instructable on home-made Sugru.

    Very nice! The approximation to a molded plastic component is to be applauded.

    However, for those of you here that are balking at the high priced processes mentioned here, I would like to submit that I have had good experiences with simply creating a counter bore in the nut material, be it plastic or wood, and then potting in the nut with a good quality epoxy. The the only tools required would be a drill, Forstner bit and a "channel lock" pliers. Better yet is maybe a drill press and vise.

    Yep good at a pinch, but before going ahead and making from scratch or using epoxy/schmepoxy I recommend going to the dump - find where they keep the lawnmowers, thar be finger nuts a-plenty keeping the what? push bars? handles? tubular steel stuff together.

    Ya can see em on this mower  

    Just sayin' ;)

    This is way too much work for me. I just epoxy glue bolts into water bottle caps. The ribbed outside surface acts as a great large thumbscrew.

    I look at all Instructables as suggestions from which I can deviate according to my capabilities, needs, and resources. As germeten suggested, you can use a plastic cap or whatever as a mold. It dawned on me that I have some worn out caster wheels that, when addressed by a saw and a file will make some nice finger nuts.

    ...or just heat the nut with the bolt threaded in to flush, and push it into your plastic part (I've threaded lamp rod into PVC caps this way), or embed in car body filler and sand till you get the shape you want. (Plastic jar, jug or milk bottle caps can serve as molds for your outer shape.) Not everything needs to be high tech or expensive.

    Danzo 321,

    Should you decide to start casting and selling these, dont forget about us amature photographers that occasionally want a short piece of threaded rod with a set of knurled ring nuts to tighten to hold our wacky contraptions into place between photo mount brackets. Will I make my own? No, too busy. I would buy them off the internet though.


    1 reply

    It's also really easy to make a bunch of these if you have access to a 3D printer. Thingiverse has a number of parametric OpenSCAD scripts to create the exact size you need.

    well done.. got me thinking: I cast urethane plastics and rubbers; I could press shapes into plasticene and set nuts with bolts in them (to keep from filling) in them, then pour a tough (80 durometer?) finger nut around them.

    1 reply

    Great idea! Will need a thick layer of Vaseline between the bolt and the nut though, especially if you use pressure. If you cast your own, the finger nut does not have to be only black either :)