Pipe Plug Socket Applications

[u118224]

Most full line hand tool companies sell a pipe plug socket set from 3/16 to 3/8. I can think of many applications for the 3/8, but what are the smaller ones used on?

 

[plinker]

I've run into the smaller sizes on 1/8 & 1/4 NPT pipe plugs on truck air systems and such. Not super common, but they do have them on some other applications.

A 3/8 in 3/8 drive & 1/2 in 1/2 drive will cover 99% of what most will run into.

 

[Dieselhammer]

Cat 3406e motors have a pipe plug going into an oil passage on the lower right side of the block that takes a 5/16" square male pipe plug socket. Usually 1/4, 3/8, and 1/2" get you by.

 

[u118224]

Thanks for the replies, much appreciated.

 

[PartsGuy]

I just had to use a female 9/32 to shut off the hot and cold water lines under a sink. The shut valve doesn't have traditional handles, only a male square drive..... presumably their idea of a "tamper resistant" design?
I had started with my 8-point 1/4 and 5/16, but nope.....

 

[jimmyin3D]

I’ve used a 13mm square plug socket for Subaru rear diffs. Also 8mm/10mm square plug sockets for jeeps and Volvo’s.

 

[matt_i]

the 3/8" square is go-to for messing around with garage door torsion springs and cable-sheaves.

 

[Steve_P]

AMC also used a female 5/16 square oil passage plug