Osg 1400102301 Thread Forming Tap 2-56 Unc Bottoming Cobalt

Product Description

The OSG 1400102301 is a thread forming tap designed for creating 2-56 UNC internal threads without cutting chips. Made from cobalt high-speed steel with a steam oxide coating, this bottoming tap is built for use in blind hole applications where full thread depth close to the bottom of the hole is required. It operates with a right-hand thread direction and carries a Class 2B fit with an H3 thread limit, making it suited for standard tolerance threading work. Licensed machinists and tool-and-die technicians are the primary users. The 1.75-inch overall length and 0.437-inch thread length make it a compact, precision tool for small-fastener work.

The OSG 1400102301 is rated for use across a wide range of workpiece materials including alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. Its bottoming chamfer of 1 to 1.5 threads makes it the correct choice when threading must extend as close to the bottom of a blind hole as possible. It fits into standard tap holders with a 0.141-inch shank diameter and a 0.110-inch square drive. This tap belongs to the OSG HY-PRO NRT series, which is engineered specifically for thread forming rather than thread cutting, meaning no chips are produced during the tapping operation.

Key Features

• Thread forming design displaces material rather than cutting, eliminating chip buildup in blind holes
• Cobalt construction provides heat resistance and durability in tough workpiece materials including hardened steel and stainless steel
• Steam oxide coating reduces friction and improves lubrication retention during tapping
• Bottoming chamfer of 1 to 1.5 threads allows threading to full depth in blind holes
• H3 thread limit with Class 2B fit meets standard UNC tolerance requirements
• Right-hand thread direction compatible with standard tapping equipment

Compatibility

Designed for use with standard tap holders and tapping heads that accept a 0.141-inch shank diameter with a 0.110-inch square drive. Rated for threading alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Part of the OSG HY-PRO NRT series, catalog series 14001.

Installation Notes

Thread forming taps require adequate lubrication at the tap and workpiece interface — use a tapping fluid appropriate for the workpiece material. Power the machine down and secure the workpiece before tool changes. Do not reverse a thread forming tap under power without confirming the tapping head supports reversal. Use a torque-limiting tap holder when working with small-diameter taps to avoid breakage.