Hertel K008477AS25 Straight Flute Tap 7/16-14 Unc

Product Description

The HERTEL K008477AS25 is a straight flute plug tap designed for cutting internal threads in through-holes and shallow blind holes. Built from high-speed steel with a titanium nitride (TiN) coating, it produces 7/16-14 UNC right-hand threads across a thread length of 1-7/16 inches. The plug chamfer distributes cutting load across several leading threads, making it suitable for general-purpose tapping in a wide range of materials. With 4 flutes and an overall length of 3-5/32 inches, this tap is sized for standard machine and hand tapping operations. The H3 thread limit indicates a tolerance class appropriate for standard fit applications. Machinists, maintenance technicians, and tool-room operators rely on this type of tap for production and repair threading work.

This tap is suited for threading ferrous and non-ferrous materials in job-shop, production, and maintenance environments. The TiN coating reduces friction and extends tool life compared to uncoated high-speed steel, making it a practical choice for moderate-volume threading operations. The straight flute design works best in through-holes or short blind holes where chip evacuation is not a critical concern. Coolant-through capability is not provided, so conventional flood or mist coolant applied externally is recommended when operating at higher speeds.

Key Features

• 7/16-14 UNC thread form for standard fractional inch thread applications
• High-speed steel construction provides toughness for general-purpose tapping
• Titanium nitride (TiN) coating reduces friction and increases surface hardness for longer tool life
• Plug chamfer with 4 flutes distributes cutting forces for smooth thread entry
• H3 thread limit for standard tolerance fits
• Right-hand thread direction for conventional tapping operations

Compatibility

Designed as an OEM-style replacement or direct-use tap for any application requiring a 7/16-14 UNC straight flute plug tap in high-speed steel with TiN coating.

Installation Notes

This tap is installed by machinists and maintenance technicians using a tap wrench, tapping head, or CNC machine spindle. Ensure the workpiece is securely fixtured and the pilot hole diameter matches the recommended tap drill size for 7/16-14 UNC threads before beginning. Apply appropriate cutting fluid to the tap and workpiece to prevent galling and extend tool life. Do not force the tap if resistance increases unexpectedly — back off to clear chips before continuing.