Instrument Hole Punch - Ats-123C

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Part# 12-02743
MFR Model# 123C


Itís not easy to make a perfect instrument hole, but this tool will make it a snap. Itís a punch made out 4140 tool steel that has been hardened and precision ground to produce clean, flawless holes in aluminum up to 1/8Ē thick. Dual reversible design for punching both 2-1/4Ē and 3-1/8Ē holes.
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In The Box

  • Size: 2-1/4" & 3-/18"
  • Weight: 4 lbs
  • Frequently Purchased With
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High quality, works as described.

Steve W Verified Purchase

ATS INT HOLE PUNCH 2-1/4&3-1/8

July 5, 2023

One of the best tools ever made regarding panel upgrades or new builds no matter what this is the way.

Airsports I Verified Purchase

ATS INT HOLE PUNCH 2-1/4&3-1/8

March 23, 2023

Works great. Very clean holes, perfectly sized. Quality tool.

Patrick D Verified Purchase

ATS INT HOLE PUNCH 2-1/4&3-1/8

August 24, 2022

John L Verified Purchase

ATS INT HOLE PUNCH 2-1/4&3-1/8

March 22, 2022

Works well. What seems to work best is continue to tighten the nut until you hear two. I use it in combination with a hole jig.

Kenneth E Verified Purchase

ATS INT HOLE PUNCH 2-1/4&3-1/8

March 18, 2022

Works good, lube threads and connect surface of nut before use

Eaa C Verified Purchase

ATS INT HOLE PUNCH 2-1/4&3-1/8

October 28, 2021

Very nice tool and fits my needs

Oren R Verified Purchase

ATS INT HOLE PUNCH 2-1/4&3-1/8

October 12, 2021


Douglas A Verified Purchase

ATS INT HOLE PUNCH 2-1/4&3-1/8

July 2, 2021

Worked very well. Made short work of cutting instrument holes after lubing the threads. Just wait for the second click.

Jerry S
December 18, 2020

Life saver! Well more like time saver! Wow how quickly it was able to cut through .085 T3 aluminum, took some effort at the end with sheetmetal this thick, but it did it and it did not warp or bend as anticipated. Its worth the I always say...time is money and what is your time worth?? Highly recommend! Great tool, high quality.

Sherman C
November 7, 2020


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: What is the thickest aluminum this tool can punch through? Regarding Part # 12-02743

This tool can punch through aluminum up to 1/8 inch (.125).

Q: Can this instrument hole punch be used on panels made from composite / GRP? If not, can you recommend an alternate?

This tool is designed to be used with aluminum panels. I would suggest a hole saw with teeth to cut the material.

Q: What gauge metal can this instrument hole punch get through?

This hole punch can get through aluminum up to 1/8" (.125) thickness.

Q: What is the diameter of the center bolt?

The diameter of the center bolt is .625".

Q: Does this punch do BOTH 2-1/4 and 3-1/8 holes?

Yes, it is a reversible cutter for both 2-1/4" and 3-1/8" instrument panel holes.

Q: Where can you get the plate to help you line up the holes for the mounting screws?

See our mounting hole template, part number 12-14600.

Q: Do you have operating instructions for this tool?

No, the manufacturer does not supply instructions with this tool.

Q: Can this tool be used to oversize current holes ? I have some 2in holes (automotive) in my instrument panel that must be oversize for 2 1/4in. Thanks!

Yes it can. As long as you want to make the hole bigger.

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