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Part# 12-04975
MFR Model# 3882-1/2


The ATS 3882-series Cylinder Base Nut Wrenches are made from forged alloy steel, tempered, and hardened for maximum strength. They also have an industrial chrome plating to improve surface wear, and protect against rust and corrosion. Their thin-wall construction guarantees they will fit nuts close to the cylinder casing without grinding down the wrench’s outer diameter. And with a 15” span, they clear even the tallest cylinders. In fact, the 3882 Cylinder Base Wrenches address just about every concern of the previous 2882 series, while including several enhancements to make your work easier. They also carry the ATS Pro lifetime warranty, so they may very well be the last cylinder wrenches you’ll ever have to purchase.
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  • 1/2” Hex Size.
  • Fits all Continental, most Lycoming, and many other types of aircraft engines.
  • 15” (381mm) span fits around almost all aircraft cylinders.
  • 0.14”(3.5mm ) thin wall fits into tight areas.
  • 12-point end fits both hex 12-point nuts.
  • 1/2” square drive.
  • Forged from 4130 steel and tempered for maximum strength.
  • Industrial chrome plating improves surface hardness and resists corrosion.
  • Quality tested to meet or exceed engine manufacturers torque specs.
  • Replaces our 2882 series wrenches.
  • ATS Pro Lifetime warranty.

Application Eligibility

  • 9/16" - Continental A50, A65, A75, A80, C75, C85, C90, C125, C145, 0-200, 0-300, G0-300, E-165, E-185, E-225, and IO-360 series engines.
  • 1/2" - Continental A50, A65, A75, A80, C75, C85, C90, C125, C145, 0-200, 0-300, G0-300, E-165, E-185, E-225, and IO-360 series engines.
  • 5/8" - Continental A-65, 0-470, and IO-520 engines.
  • 3/4" - Lycoming Wide Deck engines, as well a the Lycoming models IO-390D & D2 engines. It is also used for some of the older Continental engines such as the original A-series.
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This one was so much better than the $18.95 one.

Douglas W
April 14, 2021

Worked great. No modifications needed. Use on Lycoming O-290.

Mark G
December 27, 2018

Just as described.

Ray J
June 1, 2018

The quality of the wrench was okay but not for a regular working mechanic. This wrench would not fit because the diameter of the wrench end was too thick and could not fit in between the cylinder wall and nut face. I will send it back or try to grind it down. I had to borrow a wrench to finish the job. Not happy with it.

Joseph E Verified Purchase


August 17, 2023


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.

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