Control the speed according to the hardness of the material. Recommended feed rate: General steel: 6-15m/min; harder steel: 5-10m/min; stainless steel: 2-7m/min; cast iron: 8-10m/min. With Hand Tap Bottoming ISO 529 Form C HSS-G - UNEF 1 x 20 you create a thread interface that must assemble without force. Preparation of the hole or blank and... Tap Material: High Speed Steel. Cutting Direction: Right Hand. Thread Cutting Tap 1-20 UNEF Right Hand Machine Tap - High Speed Steel (HSS) Straight Flute Tap, Grade 2B Machine Thread Tap Find many great new & used options and get the best deals for 1"-20 UNEF Tap and Die Set Right Hand, 1" x 20 UNEF Thread Tap and Round Die at the best online prices at ! Free shipping for many products Die Material: Alloy Tool Steel. Straight Flute Thread Taps Straight flute design, used for through hole and shallow blind hole tapping, not for blind hole tapping. 【Application】Make or repair thread, suitable for most metals, copper, alloy steel, cast iron, aluminum, brass, abrasive steel, A3 steel, iron plate ETC. 1 Inch 20 UNEF Round Die 1 Inch 20 UNEF Threading Tools 1-20 UNEF HSS Right Hand Tap And Die UNEF Die For Tooth Taps And Round 1-20 UNEF Thread Tap Die HSS Machine Tool Metal Cutting Kit UNEF Tap And Die Set 【Package Include】1 pc 1-20 UNEF Thread Tap & 1 pc 1-20 UNEF Round Die.