Osg 1761701 Spiral Flute Tap 7/16-14 Unc 3 Flutes

Product Description

The OSG 1761701 is a spiral flute tap designed for threading 7/16-14 UNC holes in a range of ferrous materials. It features a 45-degree right-hand helix and a modified bottoming chamfer, allowing threads to be cut close to the bottom of blind holes with reliable chip evacuation. Built from vanadium high-speed steel with a steam oxide coating, this tap provides improved lubricity and wear resistance under production conditions. The Class 2B thread fit and H7 thread limit make it suitable for standard fastener applications where moderate tolerances are required. It belongs to OSG Series 303 and is sold individually.

This tap is intended for use in stainless steel, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces. The spiral flute design actively pulls chips up and out of the hole, making it well suited for blind-hole tapping operations on CNC machining centers, drill presses, and tapping machines. The modified bottoming chamfer reduces the number of full-thread lead-in turns needed, which is an advantage when thread depth close to the hole bottom is required. It is appropriate for both job-shop and production environments handling 7/16-14 threaded fastener holes.

Key Features

• 45-degree right-hand spiral flute for positive chip evacuation in blind holes
• Modified bottoming chamfer for threading near the bottom of blind holes
• Vanadium high-speed steel construction for extended tool life in carbon and stainless steels
• Steam oxide coating improves lubricity and reduces galling
• H7 thread limit and Class 2B fit for standard threaded fastener applications
• No coolant-through design — suitable for conventional flood or mist coolant delivery

Compatibility

Designed for tapping 7/16-14 UNC threads in stainless steel, high-carbon steel, low-carbon steel, and medium-carbon steel. Produces Class 2B internal threads conforming to UNC standards with an H7 thread limit.

Installation Notes

This tap should be installed and operated by a qualified machinist familiar with threading operations and toolholder requirements. Power down and secure the workpiece before mounting or removing the tap from any holder. Use a proper tapping chuck or floating holder to prevent tap breakage from misalignment, and apply an appropriate cutting fluid or tapping oil for the material being machined. Do not exceed the recommended speed range for the material and tap size, and avoid forcing the tap into the hole if resistance is felt.