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Part# 12-03771
MFR Model# ASPS78


Aviation spark plugs have special needs; using a non-standard 7/8" hex, and exhaust manifolds can get in the way of wrench access. A thin-wall socket is necessary for many applications. To ensure compatibility with all makes of plugs including Champion and Tempest, a deep well is called for.

This Aviation Spark Plug Socket meets all these needs, with a combo hex and 3/8" drive for additional flexibility. Pro-quality.


  • Developed specifically for general aviation aircraft
  • Compatible with Tempest and Champion Spark Plugs
  • Thin wall for fit into narrow cavities
  • Combined built-in 1" hex and 3/8" drive permits added flexibility in manifold access
  • Lifetime guaranteed and professional quality


  • Dimensions: 3.15 Inches Length x 1.25 Inches in Diameter
  • Weight: 0.5 lb.
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This was initially was described on their website as 1.5 diameter. After bringing this problem to Aircraftspruces attention they changed the diameter to 1.25 (And said that customers simply have to see if the socket fits their requirements??!!) In order for an extended socket to fit into the sparkplug well of some Lycoming 0-360 engines the diameter has to be 1.18 (1 11/64) or less. This socket will not work unless it is modified to that diameter. Buyer beware !!!

Chris L
September 27, 2019

Walls are too thick making it useless for bottom plugs on my IO540. Itâs deep enough for the tempest fine wire but the walls wonât allow it to get past the spark plug relief cut into the cylinder. Since this is billed as an aviation spark plug, 1 Star. Otherwise itâs a good deep wall socket.

April 11, 2019

barely worked with tempest plugs in io360. NOT as thin walled as my IAs. Going to get one like his and return this one.

Yan H
March 23, 2019

Great quality socket and worked perfectly!

March 7, 2019

Works perfectly!

Jim P
July 23, 2018

Great product, fast shipping

Michael P
April 13, 2018

It didnât fit on the lower plugs of my O235. The OD of the socket is 1.25â and a regular 7/8â is 1.16â. Used a regular 7/8â deep socket. Kind of annoying since I waited for this to do the job.

Charlie D
March 24, 2018

Works as you would expect, not clear it is any better than a Craftsman thin wall deep socket. The Champion socket works better at retaining the plug.

January 14, 2018

January 7, 2018

Exactly what I needed.

Matthew B
September 15, 2017


Q: What is the length of this spark plug socket?

The length of the entire socket is 3.145".

Q: Is this spark plug socket designed to work on both Champion and Tempest plugs?

Yes. This unit is designed to be used with Champion and Tempest plugs.

Q: Does this socket have the rubber ceramic protector?

No. This does not have a rubber protector.

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