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BSN Carbide Burr Blank Return to Burr Menu
Shape SN (Inverted Cone)

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Blank Designation A B C D Degrees
Nominal Actual Nominal Actual
BSN-51 1/4 .265±.005 1/4 .250±.010 .221 10
BSN-2 3/8 .390±.005 3/8 .375±.010 .305 13
BSN-3 1/2 .515±.005 1/2 .500±.010 .374 16
BSN-4 1/2 .515±.005 1/2 .500±.010 .266 28
BSN-5 5/8 .640±.005 5/8 .625±.010 .431 19
BSN-6 5/8 .640±.005 3/4 .750±.010 .403 18
BSN-7 3/4 .767±.006 5/8 .625±.010 .432 30
All dimensions in inches.

Blank Designation TechMet Stock Number by Grade
TMK-15A TMK-15B
BSN-51    
BSN-2 23204 22008
BSN-3    
BSN-4 23064 21064
BSN-5    
BSN-6 23201 22004
BSN-7 23202 22005