Balax 11742-010 Thread Forming Sti Tap 8-32 Unc H2

Product Description

The BALAX 11742-010 is a thread forming STI tap designed for cutting 8-32 UNC internal threads in through-hole and bottoming applications. Unlike cutting taps, thread forming taps displace material rather than cutting it, producing stronger threads with no chips to clear. This tap is manufactured from high-speed steel with a bright, uncoated finish and carries an H2 thread limit, making it suitable for controlled-tolerance threading in metalworking and maintenance applications. It belongs to the BXSTI series and is intended for use by machinists, tool and die technicians, and industrial maintenance professionals.

This tap is used in bottoming applications where threads must extend to the base of a blind hole or where full thread engagement is required near the bottom of a bore. The 8-32 UNC thread form is common in light fastener assemblies, instrument panels, electrical enclosures, and precision sheet metal work. The STI designation indicates it is designed for producing threads sized to accept a thread insert, making it appropriate for repair work or for building in insert-ready tapped holes during original fabrication.

Key Features

• Thread forming design displaces material for chip-free, stronger threads
• STI thread form produces holes sized for helical thread inserts
• Bottoming chamfer allows threading to the bottom of blind holes
• H2 thread limit for controlled tolerance fit
• High-speed steel construction for durability across common workpiece materials
• Bright uncoated finish suitable for use with standard tapping lubricants

Compatibility

Designed as an OEM-style replacement and standard production tap for use in applications requiring 8-32 UNC STI thread inserts in metalworking, maintenance, and light manufacturing environments.

Installation Notes

Thread forming taps require a specific tap drill size - use the 75% thread drill size of 0.1880 inches for proper material displacement. Apply appropriate tapping fluid for the workpiece material before use. Secure the workpiece fully before tapping and use a calibrated tap wrench or CNC tapping attachment to maintain axial alignment. Follow applicable shop safety practices when working with rotating tooling.