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RobbieKnobbie
07-07-2011, 07:06 PM
I came across this fitting today and I need to replace it but for the life of me I can't figure it out...

The top is a standard zerk type nipple, but the threads stump me:

They are tapered, with an upper diameter of about 5/16. So far so good. But the thread pitch is just about 20tpi. if it were 1/16npt the threads would be much finer, but these are visually too coarse by a long shot.

Could one of you metric types chime in here? Perhaps it's some wacky whitworth tapered thread that only makes sense after your fourth warm pint?

Ohio Mike
07-07-2011, 07:21 PM
Grease fittings can be 5/16"-24TPI, that is probably what you have.

John Stevenson
07-07-2011, 07:46 PM
8mm x 1.25 pitch equals 5/16" x 20.32 tpi

Standard metric greaser together with 6mm x 1.0 pitch and only on my second warm pint.

PeteF
07-07-2011, 08:10 PM
Perhaps it's some wacky whitworth tapered thread that only makes sense after your fourth warm pint?

You mean like one of these wacky things? ;)

http://www.saeproducts.com/metric-zerk-eightstraight.html

RobbieKnobbie
07-07-2011, 11:01 PM
YES! that's the very one. Thanks, guys.


Warm pints are on me

PeteF
07-07-2011, 11:40 PM
YES! that's the very one. Thanks, guys.


Warm pints are on me

Please send my contributing pint to Sir John, I owe him one if he could ever get a certain board member to admit that he was wrong whenever he is. So far we're both going thirsty :p

djc
07-08-2011, 02:03 AM
http://www.saeproducts.com/metric-zerk-eightstraight.html

Just so there's no confusion, the one directly in the link is 1mm pitch, so don't order this if you actually need 1.25 pitch...

PeteF
07-08-2011, 02:28 AM
Just so there's no confusion, the one directly in the link is 1mm pitch, so don't order this if you actually need 1.25 pitch...

Quite right, sorry about that, I clicked on the wrong link. I'm not suggesting this particular supplier, but here's the master list I took it from.

http://www.saeproducts.com/metric-grease-fittings.html#8MM