Champion UREM37BY Standard Electrode Aviation Spark Plug

Thread size: 18 mm
Reach: 1/2"/1.27 cm
Shielded Threading: 5/8" - 24

Autolite Part No.	Thread Size	Reach	Shielded Threading	Comparable Champion Part No.
UREM38E	18mm	1/2"	5/8"-24	REM38E
URHM38E	18mm	1/2"	3/4"-20	RHM38E
UREM40E	18mm	1/2"	5/8"-24	REM40E
URHM40E	18mm	1/2"	3/4"-20	RHM40E
URHB32E	18mm	13/16"	3/4"-20	RHB32E
UREB37E	18mm	13/16"	5/8"-24	REB37E
URHB37E	18mm	13/16"	3/4"-20	RHB37E
UREM37BY	18mm	1/2"	5/8"-24	REM37BY