Oil Temperature Bulb Adapter

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Part# 95527
MFR Model# 95527


Brass fitting used to shorten long capillary bulbs for use in light aircraft engines. Internal 5/8-18 threads mate with fitting on bulb. External 5/8-18 threads fit into engine.
Made in USA
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -



Duncan G Verified Purchase


March 23, 2022

Came fast with regular mail. It was just what I needed.

Phil D
September 11, 2020

Have not used this adapter, but found that is has a flat seat for the temperature bulb to seal against. This needs to be mentioned in the catalog description.

Wheelock E
June 6, 2020

Just what was needed.

Tailwinds L
May 9, 2020

Fast and accurate description. Worked as advertised.

David H
April 20, 2020

A nice piece of gear! I had a problem with the very large oil temp sensing bulb taking up enough space inside the sensor area that it restricted oil flow enough to drop oil pressure. This fitting backed up the sensor bulb enough inside the cavity to open up a flow path. Perfect! I used copper washer type gaskets from NAPA to seal the adapter into the sensor opening and its drip free. It is machined inside to accept tapered seat oil temp sensors. You can also stack these things if you need a really significant backing up of your temp sensor bulb, just put another copper washer gasket between the two adapters.

Robert J
November 25, 2019

Female threaded end not as deep as the one I replaced had. Concerns about enough thread engagement. Nearly 1/16 shallower.

Paul L
May 7, 2018


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: Is this fitting 5/8-18 UNF?

Yes, that is correct.

Q: What is the diameter of the center hole in this adapter?

This is .450".

Q: Does the bulb seal inside the adapter?

You would want to use a copper crush gasket on both ends of the adapter.

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