53/64 deep socket

[ajchien]

After reading about the 57/64 deep socket in a thread a week ago, I find an old Duro 53/64 socket my tool box. I must have picked it up for the heck of it, i don't ever recall using it. So... Anyone know what had a 53/64 bolt/nut on it?

 

[blackz26]

22mm fasteners?

War era?

 

[theknurl]

53/64= 21.0344mm

not a very useful socket size

maybe it fits some Brit stuff

 

[ken w.]

Isn't that pretty close to 13/16 ?

 

[humber2]

Isn't that pretty close to 13/16 ?

Yes, It's the clearance for 13/16 which we should all know was the normal spark plug hex.