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Binding screw thread

post #1 of 10
Thread Starter 
Alpine binding screw threads are #12 right? Can someone give me more information on them? I know the taps are 12AB. What does AB stand for? What is the thread pitch on these #12?
post #2 of 10

I'm pretty sure the thread is unique, and that you have to buy the tap from a specialty ski supplies dealer. It is more coarse than any standard taps I have. And it has to be a bottom tap. pretty special item. sells for about $18

post #3 of 10

SlideWright.com sells binding screws..

post #4 of 10
Thread Starter 
I still need to know what's the thread specs are.

Davluri did you compare the alpine thread to a 12-24 tap or what?
post #5 of 10
Quote:
Originally Posted by killerbee View Post

I still need to know what's the thread specs are.

Davluri did you compare the alpine thread to a 12-24 tap or what?


I measured it, seems to have about 12-14 threads per inch, give or take. very coarse. I looked to buy one and avoid the ski shop mark up, but couldn't find such a creature. It's euro, you know? on the tap it says: 4.1mm is all. sorry I can't give you any more specs.

post #6 of 10

Both Slidewright and Tognar seem to sell the 12AB tap.

 

Also check out this TGR post.

post #7 of 10

Quote:

Originally Posted by killerbee View Post

Alpine binding screw threads are #12 right? 

 

No.   Metric.     Specifically M5.5 , usually specced for sheet metal screws

 

 

Quote:

Originally Posted by killerbee View Post
 What is the thread pitch on these #12?
 

   Thread pitch is in between M5 coarse (0.8mm) and M6 coarse (1mm) so nominally 0.9 mm

 

For Davluri - not particularly cheaper:

 

http://www.amazon.com/Dormer-High-Speed-Straight-Uncoated-M5-5-0-90/dp/B004J4VTZ8/ref=sr_1_1?s=industrial&ie=UTF8&qid=1362512215&sr=1-1

 

The #12 is a reference to the closest size under the Unified Thread Standard:

http://en.wikipedia.org/wiki/Unified_Thread_Standard


Edited by cantunamunch - 3/5/13 at 11:49am
post #8 of 10
Quote:
Originally Posted by davluri View Post


I measured it, seems to have about 12-14 threads per inch, give or take. very coarse.

 

It sounds like you only measured one side of a 2-flute tap.   If you had doubled the number (24 tpi) you would have had the correct US sizing. 

post #9 of 10

I don't follow. It could have 6 flutes. It would still be 12 threads per inch. which is what it is. which is a rough way to describe a metric tap. but I'm not spec ing for a tool and die man, I thought he wanted to mount his skis.

 

go buy one, that's easy; why does anyone have to try to pick one up at the hardware store. won't happen. wasting time. 

 

on the box it says: Wintersteiger: 4.1mm Ski Tap: Ersatzgewindeschneider:  part # blah blah blah

post #10 of 10

#12 AB. AB stands for Alpine Binding. You are not going to find a tap at your local tool supply and a regular tap will not work either. Go to Tognar or Slidewright and buy the right thing. You'll be glad you did instead of ruining a pair of skis.

 

Karl
 

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