Hertel 87004 Plug Hand Pulley Tap 3/8-16 Unc 4 Flute

Product Description

The HERTEL 87004 is a 3/8-16 UNC plug-style hand pulley tap ground from high speed steel with a bright finish. It features 4 flutes in a right-hand configuration and carries an H3 thread limit for consistent, on-tolerance threads in mid-tolerance applications. The overall length is 8 inches, giving toolmakers and machinists adequate reach for through-hole and blind-hole tapping operations on pulleys, brackets, and similar workpieces. This tap is suited to manual hand-tapping work where controlled thread engagement and accurate pitch are required. Machinists, tool room technicians, and maintenance professionals are the primary users.

The HERTEL 87004 is designed for 3/8-16 UNC thread forming in ferrous and non-ferrous metals where a plug chamfer lead is appropriate. The plug chamfer, which starts threads gradually over the first few thread lengths, makes this tap a practical choice for through-holes and for starting threads in blind holes where a bottoming tap will follow. It performs well in general maintenance and production environments where hand tapping is the method of choice. The bright finish is compatible with a wide range of cutting fluids and tapping compounds.

Key Features

• 3/8-16 UNC thread size for standard unified coarse pitch applications
• 4-flute geometry provides rigidity and chip clearance for clean thread formation
• Plug chamfer lead allows use in through-holes and as the first pass in blind holes
• H3 thread limit ensures consistent mid-tolerance fit across production runs
• High speed steel construction resists wear during repeated use in steel and cast iron
• Bright finish is compatible with most tapping fluids and lubricants

Compatibility

Designed as a hand pulley tap for 3/8-16 UNC thread applications in general machining and maintenance environments. No specific machine or equipment compatibility was provided by the manufacturer for this part number.

Installation Notes

This tap is intended for hand tapping using a tap wrench or T-handle driver. Always apply an appropriate cutting fluid or tapping compound to the tap and workpiece before starting. Secure the workpiece firmly and align the tap square to the hole before applying torque to avoid tap breakage. Follow applicable shop safety practices and, where applicable, OSHA general industry standards for hand tool use.