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Eccentric Clamps - Workholding

Kurtis Saiyo

Project by

Kurtis Saiyo
Oakland, CA

General Information

These are some clamps inspired by Miteebite clamps, but utizing the Inventables eccentric nuts and 5mm BHCS (much cheaper!). Two designs, one uses a plate cut to the golden ratio, the other (to be built) has a 30 degree angle to add some normal force to prevent lifting.

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Material Description Price
Aluminum Sheet 6061

Aluminum Sheet 6061

Dimensions: 12 in × 12 in, Thickness: .125 in


Button Head Cap Screw

Button Head Cap Screw (×8)

Length: 25mm, Pitch: 0.8mm, Quantity: 10, Thread Size: M5


Eccentric Nut

Eccentric Nut (×8)

Spacer Type: Nut

This project's Bill of Materials is not complete.

from Inventables

File Description Unit Price
File type blank

Eccentric Clamp v8.step

Flat eccentric toe clamp clamp drawing


File type blank

Toe Clamp v2.step

Angled toe clamp drawing


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from Inventables


Collect Materials

5 minutes

1 – 9/32 Drill bit
1 – length of 1″ × .125″ Aluminum bar stock
1 – eccentric nut
1 – 5mm x 25mm Button Head Cap Screw


Measure and cut the bar stock

1) measure and etch a line at 1.60 inches (I use a machinists scale with 10th’s graduations)
2) Cut the bar stock and clean up as necessary (I used a file to clean up the edge since I used a sawzall to cut) - Alternatively you can use the X-carve to cut a 1.60″ × 1.00″ rectangle out of 0.125 aluminum plate.


Measure and drill the hole

1) Measure 1" down the long side of the rectangle and etch a line across
2) Etch a diagonal line corner to corner on the aluminum rectangle
3) Etch a diagonal line corner to corner across the 1.00″ × 0.60″ square created in step 1
4) Drill a 9/32" hole at the point the two diagonal lines cross

This will be your clamping bit – for lack of a better term.



1) screw the eccentric nut all the way down to the root of the 5mm screw
2) arrange the bit in a way so that it is barely or nearly making contact with your workpiece and lined up with the wasteboard threaded inserts, feel free to use the corners as well as the flat edges of the bit.
3) hand screw the eccentric nut into the wasteboard through the bit until the eccentric fully inserts into the bit,
4) tighten the screw, it should clamp your work piece.