pipe threads with teeth?

[Husky Dad]

Im installing a rubinet wall mount faucet. The 1/2 male thread pipe that comes out of the back of the faucet ( for wall connection) has teeth or smaill grit made into the thread. Got any info on what this type of thread is called and its purpose? I'm thinking its to give a good grip without having to completely seat the fitting. Any help would be appreciated. H D

[Terry]

Can you post a picture?

Washington beats USC 16 to 13
Go dogs!

[Husky Dad]

No sorry, left the fixture at the job site. The 1/2 inch threaded male piece looks just like any connection ive seen except, if you look close , you see very tiny teeth, or symetricaly placed grit, which i believe are supposed to cut into the copper female threads.

[Terry]

which i believe are supposed to cut into the copper female threads.

Which model is it?
Are you sure it doesn't use rubber washers at the connection?

[Husky Dad]

Rubinet wall mount kitchen bridge faucet 8WRBRVC

http://www.rubinet.com/pdf/1699_specs.pdf

[Terry]

The swivel would have a rubber washer and the tapered thread would use either pipe thread sealant, past or tape.

[gardner]

The 1/2 male thread pipe that comes out of the back of the faucet ( for wall connection) has teeth or smaill grit made into the thread.

My guess is that you are looking at the results of galling that has occurred during manufacture, due to the reduced machinability of lead-free brass, possibly combined with thread dies designed for normal machinable brass.