Value Collection MSC-04477170 3/4-16 Unf Bottoming Tap Hss

Product Description

The VALUE COLLECTION MSC-04477170 is a straight flute bottoming tap designed to cut full threads close to the bottom of blind holes. It is ground from high-speed steel (HSS) with a bright, uncoated finish, providing adequate hardness for threading steel, aluminum, and similar materials. The tap runs a 3/4-16 UNF thread form with a 3B class of fit, an H3 thread limit, and 4 flutes. It covers 2 inches of thread length within an overall length of 4.25 inches. Machinists, tool-and-die workers, and maintenance technicians install this tap in manual tapping fixtures, drill presses, or CNC machines for production and repair threading operations.

This tap is suited for applications where threads must be carried to near the bottom of a blind hole — such as hydraulic manifold ports, structural fastener bosses, and precision mechanical assemblies. The 3/4-16 UNF thread is common in aerospace, automotive, and industrial machinery hardware where fine-pitch threads are required for tight tolerances or thin-walled sections. The right-hand thread direction and 3B fit make this tap a standard choice for general-purpose fine-thread work in both job-shop and production environments. Coolant-through capability is not featured, so conventional cutting fluid application is recommended for deeper holes.

Key Features

• Bottoming chamfer allows threading to within 1-2 threads of a blind hole bottom
• 3/4-16 UNF thread form with 3B class of fit and H3 thread limit for standard tolerance control
• 4-flute straight flute geometry suits through-hole and shallow blind-hole applications
• High-speed steel construction handles a broad range of ferrous and non-ferrous workpiece materials
• Bright, uncoated finish allows easy inspection of the cutting edges before and after use
• Right-hand thread direction — compatible with standard tapping spindles and tap wrenches

Compatibility

Designed as an OEM-style replacement or standard tooling option for any application requiring a 3/4-16 UNF bottoming tap with a 3B class of fit and H3 thread limit in high-speed steel.

Installation Notes

This tap is installed and operated by machinists or maintenance technicians using a tap wrench, tapping fixture, or machine spindle rated for the required torque. Secure the workpiece firmly before tapping, and use an appropriate cutting fluid or tapping compound to reduce heat and extend tool life. When tapping blind holes, clear chips frequently by reversing the tap to avoid packing and tap breakage. Inspect cutting edges for wear or chipping before each use and replace the tap if the thread form is compromised.