Thread typeMachineWorkpiece material Drill Head Categories Brazed Drill Heads Applications STS (Single Tube System) DTS (Double Tube System) MBU UTE BTU ETU Brazed drill heads Drill diameter (mm) ø8 - ø14.79 ø12.6 - ø20 ø12.6 - ø65 ø18.4 - ø65 External single-startthread ◯ - - - External 2-startthread - ◯ *1 ◯ *1 - External 4-startthread - ◯ *2 ◯ *2 ◯ Hole tolerance IT9 IT9 IT9 IT9 Surface finish Ra (μm) 2 2 2 2 Deep hole drillingmachines ◯ ◯ ◯ ◯ NC machines - - - ◯ Lathes - - - ◯ Machining centersM/C - - - ◯ Steel ★★★ ★★★ ★★★ ★★★ Stainless ★★★ ★★★ ★★★ ★★★ Cast iron ★★★ ★★★ ★★★ ★★★ Non-ferrous ★★★ ★★★ ★★★ ★★★ Superalloys ★★ ★★ ★★ ★★ Hard materials(≥40HRC) ★★ ★★ ★★ ★★ Page 10 11 12 - 14 15 ★★★ (Excellent) ★ (Standard) *1: UTE & BTU Drill head : ø12.6 mm - ø15.59 mm, External 2-start thread *2: UTE & BTU Drill head : ø15.6 mm - ø65 mm, External 4-start thread Brazed drill head ― Coated area Guide pads Thread Insert Coated area Photo: UTE 06 www.tungaloy.com