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					Originally Posted by  RichRobby
					 
				 
				I believe the size is M10 x 1 (pitch) and it is 31.35mm long. 
For those of us who have sheared off a stuck nipple and couldn't get the remains out I came across this on Ebay UK which includes a 11mm drill, an M12 x 1 thread tap and a M12 bleed nipple. If you already have an M12 x 1 thread tap then the bleed nipple is available on its own.
  M12 X 1.0 Repair Kit with Stainless Steel Bleed Nipple Screw for Brake Calipers | eBay
I can also confirm what I read on a different thread that welding a washer over the broken nipple and either building up the centre of the washer with plenty of weld to get something to grip or then welding a nut to the washer worked for me. I think the heat from the welder helps a lot and the washer protects the caliper body.  
			
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good ideas
 
while the length is 31.35 mm, how exactly is that measured???
		  
		
		
		
		
		
		
			
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