Hertel K008082AS Straight Flute Tap 4-40 Unc Hss

Product Description

The HERTEL K008082AS is a straight flute tap designed to cut 4-40 UNC internal threads in a wide range of materials. It features 2 flutes and a plug chamfer, making it suited for through-hole tapping applications where chips can evacuate ahead of the tap. Manufactured from high-speed steel with a bright, uncoated finish, it delivers reliable performance across general-purpose threading tasks. The H2 thread limit provides controlled tolerance for consistent 2B and 3B class-of-fit threads. Overall length is 1.875 inches. Right-hand thread direction is standard. This tap is a staple in machine shops, maintenance environments, and production settings where small-diameter threading is routine.

The K008082AS is intended for tapping 4-40 UNC threads in ferrous and non-ferrous metals, plastics, and similar machinable materials. The plug chamfer style requires a starter hole and is best suited for through-hole applications rather than blind holes. It is commonly used in machine shops, tool rooms, and assembly operations where small-fastener threads are needed in production or repair work. The straight flute design keeps the tool simple and rigid for use in hand tapping or low-speed machine tapping setups.

Key Features

• 4-40 UNC thread form cuts standard small-diameter machine screw threads
• 2 straight flutes provide rigidity and straightforward chip management in through-hole applications
• Plug chamfer eases entry and distributes cutting load across the leading threads
• High-speed steel construction handles general-purpose threading in a broad range of workpiece materials
• H2 thread limit ensures consistent 2B and 3B class-of-fit compliance
• Bright, uncoated finish suitable for use with standard tapping fluids

Compatibility

Designed for use in any application requiring 4-40 UNC internal threads with a 2B or 3B class of fit. Fits standard tap holders and collets sized for small-diameter taps.

Installation Notes

Use appropriate cutting or tapping fluid to extend tool life and improve thread quality. Ensure the workpiece is securely fixtured before beginning the tapping operation. For hand tapping, use a proper tap wrench to maintain alignment and avoid side loading that can break small-diameter taps. Back off periodically to break chips when tapping deeper holes.