Osg 2842101 Spiral Point Tap 7/16-14 Unc 3 Flute

Product Description

The OSG 2842101 is a spiral point plug tap designed for threading 7/16-14 UNC holes in a wide range of ferrous and non-ferrous materials. Built from 3% vanadium high-speed steel (HSS-E) with a steam oxide finish, this tap delivers improved lubricity and wear resistance compared to uncoated HSS tooling. The spiral point geometry pushes chips ahead of the cut rather than packing them into the flute, making it well suited for through-hole tapping operations. With 3 flutes, an H7 thread limit, and right-hand thread direction, the 2842101 is a production-grade tap appropriate for machine or hand tapping where consistent thread quality is required.

This tap is used in machine shops, maintenance and repair environments, and manufacturing cells where 7/16-14 UNC internal threads are produced in through-hole applications. The steam oxide coating reduces friction and helps resist built-up edge when cutting aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, hardened steel, and cast iron. The plug chamfer style provides a gradual lead-in over several threads, balancing cutting force across the tap entry. It is suitable for CNC tapping centers, drill press setups, and manual tapping operations.

Key Features

• Spiral point geometry pushes chips forward through the hole, reducing chip packing in through-hole tapping
• 3% vanadium high-speed steel (HSS-E) construction for increased toughness and wear resistance over standard M2 HSS
• Steam oxide coating improves lubricity and reduces galling, particularly in ferrous materials
• H7 thread limit (oversize) accommodates standard tap tolerances for 7/16-14 UNC threads
• Plug chamfer distributes cutting load across multiple leading threads for smooth entry
• Right-hand cut, 3-flute design compatible with standard tapping chucks and holders

Compatibility

Designed for through-hole tapping of 7/16-14 UNC threads in aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, hardened steel, and cast iron. Part of OSG Series 280.

Installation Notes

This tap should be installed in a tapping chuck or holder that provides axial float to prevent thread distortion. Always ensure the workpiece is securely fixtured and that the tap is aligned perpendicular to the hole centerline before beginning the cut. Use appropriate cutting fluid for the workpiece material to extend tool life and improve thread finish. Never reverse a tap under power without confirming the machine is set for reverse-thread extraction.