OSG Threading Tap - BA Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 9BAThe OSG BA Spiral Flute Threading Tap is a high precision tool for machinists and metalworkers who need clean, accurate 9BA internal threads in blind holes. Crafted from HSS E cobalt and finished with a steam oxide coating, it delivers dependable performance in demanding applications. Thread Size: 9BA, BA series internal thread for compact assemblies and precise fit Material: HSS E (high speed steel with cobalt) for enhanced hot hardness and longer