Balax 10525-010 Thread Forming Tap 3-48 Unc Bottoming Hss

Product Description

The BALAX 10525-010 is a thread forming tap designed to cut 3-48 UNC threads in blind holes without generating chips. Made from high-speed steel with a bright uncoated finish, this bottoming-style tap features a 2.5-thread chamfer that allows threading close to the bottom of a blind hole. The H5 thread limit ensures consistent Class 2B fit tolerances. At 1.8125 inches overall length with a 0.5 inch threading length, it is sized for small-fastener applications in precision assemblies. Machinists and toolroom technicians working with fine-pitch, small-diameter threads rely on this tap for clean, accurate internal thread forming.

This tap is suited for blind hole threading operations in materials that respond well to thread forming rather than thread cutting. Typical applications include tapping soft to medium-hardness metals in production machining, light manufacturing, and repair work where chip evacuation is a concern. The bottoming chamfer makes it the third tap in a tap set sequence or a standalone tool when threads must extend to the full depth of a shallow blind hole.

Key Features

• 3-48 UNC thread size for small-fastener blind hole applications
• Bottoming chamfer with 2.5 chamfered threads for threading near the base of blind holes
• High-speed steel construction for durability in production use
• Bright uncoated finish suitable for use with standard tapping fluids
• H5 thread limit for Class 2B fit accuracy
• No oil grooves, chipless thread forming design reduces clogging in blind holes

Compatibility

Designed as an OEM-style replacement or direct-use thread forming tap for 3-48 UNC blind hole threading applications in standard tap holders and tapping heads accepting a 0.1410-inch shank diameter with a 0.1100-inch square drive.

Installation Notes

Thread forming taps should be installed by a qualified machinist in a tap holder or tapping head rated for the shank size. Always apply appropriate tapping fluid before use and confirm the workpiece is securely fixtured before operation. Ensure the drilled hole diameter matches the recommended tap drill size for 3-48 UNC thread forming to avoid tap breakage. Power off or deactivate any machine spindle before loading or changing taps.