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Reiff & Nestor's Extension Tap, with a size of #4-40 and 2 flutes, is designed to meet your precise threading needs in various industrial applications. Made of high-speed steel, this H2 class tap delivers a high degree of hardness and durability for extended usage. The plug chamfer ensures smooth threading, while the right-hand spiral point technology guarantees accurate cuts and reliable results. With an overall length of 4, this extension tap is ideal for machining parts that require small or intricate threads. Use it in applications such as aerospace, automotive, electronic, and medical industries for high precision and consistent threaded fastener manufacturing.