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making it ideal for deep-hole work
STI-ready threading: creates the exact internal geometry required for reliable wire-thread inserts that restore damaged threads or reinforce high-load connections
Open-bore operation with pins: Pins keep the collet open during boring in a 5C lathe collet chuck
dependable checks you can rely on in daily workflows—from incoming inspections to process validation and final assembly
and a precise corner radius translates into smoother die cavities
Dormer Pramet A520 5/16 Inch HSS TiN ADX STRAIGHT SHANK STUB DRILL DIN 1897 A&NF making it ideal for deep-holeThis 5 16 inch stub drill features a straight shank and compact length that suits standard drill chucks and collets used in machine shops, maintenance work, and fabrication. Built from premium high speed steel with a TiN coating, it produces accurate holes in steel, aluminum, and stainless steel without requiring excessive setup time or secondary operations. Thinned 130 Degree Point: Promotes reliable self centering so the drill starts on location
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