9x20 Lathe Boring Bars
Last updated on Tuesday, May 20, 2014 06:08:50 AM Eastern US Time Zone

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Boring Bar Sets, QCTP Boring Bar Holder, Sleeve Adapters, Boring Head in Tailstock, Boring a Plastic Part, Boring Bars

Boring Bar Sets

Borite boring bar set (USA) that uses TPMM22_ carbide inserts. " ground shanks.




Carbide boring tool bit sets with precision ground ", " & ⅜" shanks.

QCTP Boring Bar Holder

This quick change tool bit holder also has a V-notch to hold a round (⅜") boring bar shank.
The setscrews mar the shank making it difficult to insert into precision holders e.g., a boring head.


This AXA quick change boring bar holder holds a " shank tool.

Sleeve Adapters


This ⅜" round to " square, slit, steel adapter eliminates setscrew marring on the shaft. Shaft marring interferes
with insertion/removal when using a boring head. The hole was reamed for a close precision fit to a ground shank.



This supplied sleeve accessory adapts " to ⅝" shanks for the quick change tool post boring bar holder.


A 3" long, steel, " to " adapter. The hole was precision reamed & the single slit is ⅛" wide.



The left clamps hold the adapter body while the right clamp holds both the adapter & the boring bar shank.


For use on the 9x20 lathe.


Rigid holder & excellent boring bar performance.


A " to ⅜" boring bar adapter can be added for even smaller shanks.

 Boring Head in Tailstock

A 2" diameter boring head with an MT2 (screw-on) arbor can be used in the 9x12 lathe's tailstock.
A taper cut is setup with the material held by two dead centers & driven by a faceplate with a dog.

Boring a Plastic Part

Made a Delrin spacer for a Blizzard rifle scope lens hood. I cut the outside
dimension then quickly removed a lot of ID material using a large 1" drill bit.


Bored the inside dimension. Delrin cuts smoothly & precisely.


Cutting-off the part. 


The cover is installed on the scope with the spacer inside.

Boring Bars

Boring bar set: ⅜", (2) " , ⅝", " & 1" diameters. ⅜" holds 3/16" round tool bits; others hold various sized
square bits. Each bar holds bits either perpendicular or at a 45 angle. Good for inside boring & inside threading.

Boring Bar Sets, QCTP Boring Bar Holder, Sleeve Adapters, Boring Head in Tailstock, Boring a Plastic Part, Boring Bars

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