OSG Threading Tap - BSF Spiral Point HSS-E - Steam Oxide Coated - Through Hole - 5/16 x 22

The OSG BSF Spiral Point Threading Tap is a precision tool designed for through-hole BSF threads. Crafted from HSS-E cobalt and finished with a durable steam oxide coating, it delivers reliable cutting performance, extended tool life, and consistent thread quality in demanding machining environments.

• Thread Type: BSF (British Standard Fine) spiral point design optimized for through-hole tapping, with a geometry that pushes chips forward for efficient cutting.
• Material: HSS-E cobalt alloy for enhanced hardness and heat resistance, sustaining performance under tougher cutting conditions.
• Coating: Steam oxide coating reduces friction, improves lubrication, and contributes to corrosion resistance and tool longevity.
• Size / Thread: 5/16 x 22 BSF, suitable for standard BSF through-hole applications and compatible with common machining setups.
• Through-Hole Capability: Spiral point geometry and through-hole design work together to evacuate chips quickly, minimize built-up edges, and maintain smooth operation.
• Brand Assurance: Part of OSG’s trusted threading line, backed by precision engineering and proven performance in precision tapping tasks.

With its combination of tough alloy, protective coating, and chip-evacuating spiral point, this tap delivers precise BSF threads with fewer interruptions and less rework. It’s an ideal choice for production environments or shop repairs where reliable, repeatable BSF threading in through-holes is required, helping you achieve clean threads, smoother finishes, and longer interval between tool changes.