Osg 1400106700 Thread Forming Tap 4-48 Unf Cobalt

Product Description

The OSG 1400106700 is a thread forming tap designed for producing internal 4-48 UNF threads without cutting chips. Made from cobalt high-speed steel with a bright finish, this tap uses a modified bottoming chamfer with 2 to 2.5 chamfered threads, making it well suited for blind hole threading in tight-tolerance applications. The H5 thread limit and Class 2B fit make it appropriate for precision fastener installations. At 1.875 inches overall length and 0.141-inch shank diameter, it fits standard tap holders for small-diameter work. Trade professionals install this tap where chip evacuation is a concern and where thread strength requirements are high.

This tap is intended for use in a broad range of materials including alloy steel, carbon steel, die steel, hardened steel, aluminum, and stainless steel. It is specifically suited to blind hole threading operations in both production and maintenance environments. The right-hand thread direction and standard UNF thread form make it a common choice for precision assemblies in automotive, aerospace, and general machining applications where a 4-48 thread specification is required.

Key Features

• Thread forming design eliminates chips, reducing the risk of chip clogging in blind holes
• Cobalt high-speed steel construction provides heat resistance for tough alloys and hardened steels
• Modified bottoming chamfer (2 to 2.5 threads) allows threading closer to the bottom of blind holes
• H5 thread limit and Class 2B fit deliver consistent, tight-tolerance thread geometry
• Bright finish suitable for a wide range of workpiece materials
• Right-hand thread, 48 TPI, 4-48 UNF — no coolant-through required

Compatibility

Designed for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces requiring a 4-48 UNF internal thread. Part of the OSG HY-PRO NRT Series 14001.

Installation Notes

Thread forming taps require proper tap hole sizing — use the recommended form tap drill size for the 4-48 UNF specification to avoid excessive torque or tap breakage. Install in a rigid tapping setup or a torque-limiting tap holder to protect this small-diameter tool. Apply an appropriate tapping fluid or cutting oil for the workpiece material before beginning. Always back the tap out fully and clear the hole before reinserting in a blind hole application.