Clearance angle Chamfer clearance angle Blind hole taps have a small chamfer clearance angle because they need to shear off the chip root when th

Clearance angle Chamfer clearance angle Blind hole taps have a small chamfer clearance angle because they need to shear off the chip root when they reverse. Through-hole taps (spiral point) have a larger chamfer clearance angle than blind hole taps. Due to its greater chamfer clearance angle, a spiral point tap must clear its chamfer through the through hole. Example Blind hole tap required because chip has to be transported in opposite direction to feed direction. No secondary operations required. Through-hole taps possible, but only with reduced chamfer clearance angle because of need to shear off chip root. Secondary operations required. Thread clearance angle It should be possible for a tap to turn easily into the cut thread without it causing further abrasion. If this is not possible, a tool with a greater clearance angle should be selected. Paradur WSH, Paradur WTH Prototex H, Paradur N Prototex Inox Paradur Inox Prototex Eco HT, Paradur Eco HT Prototex Synchrospeed, Paradur Synchrospeed D 444 WALTER PROTOTYP Technical information threading Application information