Part# 12-01878
MFR Model# 166
NO. 12 TO 1/2" (6 TO 12mm)3-3/4" (95mm)12-01878


The standard Tap Wrenches are perfect for creating straight and accurate thread holes in your work piece. The fixed T-Handle provides a large gripping surface for generating maximum leverage. This versatile tool can also be used with reamers, drill bits, screw extractors and other hand-turned tools.

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  • Tap Wrench has a No. 0 to No. 8 tap capacity.
  • Great for mechanics, machinists and maintenance professionals.
  • Rigid T-handle provides greater leverage.
  • Hardened steel jaws have self-centering chuck.
  • Recommended for use along with our Tap Drill Reference Table (#715).
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I purchased this tap wrench to replace an old one that finally broke. This was for my smaller taps from 2-56 to 1/4-20, and it works fine in this range. It is a General product, #164. It is well made with a nice finish and the jaws and threaded chuck work very smoothly. The handle can be removed but there is a small spring with a pin that keeps the handle from sliding out on its own. This can easily be lost, so be careful. I am very happy with the tool and it is much nicer than the one that broke (Craftsman). I think the price is fair.

Thomas C
May 12, 2019

The General brand 1/2 Tap Wrench I received did not hold a tap tightly. The tap wobbled in the Tap Wrench and was only held on the back corner of the tap. The jaws of the Tap Wrench did not clamp parallel, they did not hold the sides of the tap, they only held the back corner. I returned the Tap Wrench and Aircraft Spruce was great at quickly refunding my purchase price.

Robert E
April 17, 2021


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: I drilled a number 43 hole. Which tap wrench handle will work? I already have the tap

We believe you would want our part number 12-01877.

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