Thumbs 1
Thumbs 1
Thumbs 1

ATS Lycoming And Continental Cylinder Base Nut Wrench Kit

Add to Wishlist
Part# 12-04979
MFR Model# 3882-5


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.


  • Set of 4 wrenches in Hex Sizes: 1/2", 9/16", 5/8", and 3/4".
  • 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.

In The Box

  • Set of 4 wrenches in Hex Sizes: 1/2", 9/16", 5/8", and 3/4"
  • Frequently Purchased With
  • Customers Also Viewed
  • Related Items


Worked fine on my IO 520 with just a bit of grinding on the 5/8 wrench.

Donald T
April 27, 2021

A lot better then the other base nut wrenches

July 25, 2018

These wrenches are advertised as being redesigned so they will fit better. Unfortunately they still have to be ground down to fit the smaller continental O-200 thru O-300 engines. Should have saved my money and stuck with the cheaper set.

Charles F
November 1, 2017

Bought these instead of the cheaper set because they were advertised to fit better. Still had to grind on both the 9/16” and 5/8” to make fit. Unfortunately took too much off the 9:16” and it broke first try. I’ll buy the cheap set now.

Michael H
January 15, 2020

These base nut wrenches do not seat on a lycoming IO-360 nut.

Jeff H
September 15, 2017


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.