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The Ingersoll Rand Par-A-Matic Valve-In-Head Self-Feed Air Tapper 5/16” Chuck 8257-A8-AEU is a precision-built production tool engineered to automate tapping operations with consistency, accuracy, and efficiency. Designed for secondary machining tasks that demand repeatable thread quality, the Ingersoll Rand Par-A-Matic Valve-In-Head Self-Feed Air Tapper 5/16” Chuck 8257-A8-AEU uses compressed air for both spindle rotation and feed/control functions, creating a compact, self-contained tapping solution ideal for integration into automated machining systems.

Powered by a robust rotary-vane air motor, the Ingersoll Rand Par-A-Matic Valve-In-Head Self-Feed Air Tapper 5/16” Chuck 8257-A8-AEU delivers an impressive power-to-size ratio that minimizes tool weight and footprint?allowing greater layout flexibility for machine builders and system integrators. Installation is straightforward, requiring only simple pneumatic circuitry, and the unit can operate independently or in combination with other pneumatic or electric components within a larger production workflow.

The Par-A-Matic platform provides operators with multiple control advantages, including a built-in four-way valve that supports both manual and remote actuation. A double-acting air piston delivers smooth, balanced forward and retract strokes, while needle valve controls enable precise tuning of each motion cycle. An adjustment screw offers infinite, easily repeatable stroke-length settings, allowing the 8257-A8-AEU to adapt quickly to changing tapping depths or material requirements. Ball bearing spindle support ensures consistent alignment and long service life, even under continuous tapping loads. A muffled exhaust further reduces overall noise for a more comfortable workspace.

Engineered for simplicity, durability, and high repeatability, the Ingersoll Rand Par-A-Matic Valve-In-Head Self-Feed Air Tapper 5/16” Chuck 8257-A8-AEU is an excellent choice for manufacturers seeking a reliable, automated tapping solution that maintains thread quality while improving throughput in demanding production environments.