Lie-Nielsen Drawbore Pins - Set of 2
Drawboring is a great way to make a strong mechanical joint. A wooden pin is hammered through slightly offset holes in the two pieces, and pulls the joint together. You use Drawbore Pins to pull the joint together first (with some force and a twisting motion). This eases the edges of the hole making driving the wood pin easier. You can also disassemble the joint if you want to work on the fit some more before permanent assembly.
O-1 Tool Steel, Rockwell 60-62. Diameter at base of pin .440 in. (1.12cm) tapering to .110 in. (2.8mm) at the tip. Length overall 12in. Offered in pairs. To pre-assemble the four parts of a door frame, two pair are handy.
Two videos below feature Christopher Schwarz (Editor of Popular Woodworking Magazine) explaining the theory of drawboring mortises then demonstrating the use of drawbore pins.
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