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Unified National Fine (UNF) thread form was introduced in 1948 as an attempt to standardise thread forms in the USA
When used on external threads this series has greater tensile stress area than coarse threads of the same size
Bottoming Taps have a lead of two threads and are used to ensure minimum thread run-out when tapping to the bottom of a blind hole
Hex 50mm IMPACT Power Bit
1.0mm - 10mm x 0.5mm, 11.0mm - 13.0mm x 1.0mm, 3.2mm, 4.2mm, 6.8mm 25PCE HSS BRT DELTA POINT DRILL SET Unified National Fine (UNF) thread1. 0mm 10mm x 0. 5mm, 11. 0mm 13. 0mm x 1. 0mm, 3. 2mm, 4. 2mm, 6. 8mm 25PCE Delta Point Bright Finish HSS Twist Drill Bordo Metric Delta Point HSS Twist Drills. DIN338 Delta Point drills have a multi faceted cutting tip. Rather than try and modify existing point types, or tweak the grind angles, Delta Point tip design required a revolutionary re think of drill tip function. The overall length of the cutting edge significantly exceeds that of