Osg 2807001 Spiral Point Tap 5-40 Unc 2 Flutes H2 Hss

Product Description

The OSG 2807001 is a spiral point plug tap designed for cutting right-hand internal threads to the 5-40 UNC standard. Built from vanadium high-speed steel (HSS-E) and finished with a steam oxide coating, this tap is engineered for controlled chip ejection in through-hole threading operations. It carries an H2 thread limit and suits Class 2B and 3B fits. The two-flute spiral point geometry pushes chips forward ahead of the cutting zone, making it well-suited for production tapping in through holes where chip packing is a concern. Overall length is 1.937 inches, with a thread length of 0.299 inches and a shank diameter of 0.141 inches.

This tap is used in through-hole tapping applications across a broad range of metalworking environments, from job shops to production lines. The steam oxide finish reduces friction and provides modest lubrication retention during the cut. The H2 thread limit and 2B/3B class of fit make it appropriate for standard fastener thread tolerances in general mechanical assemblies. Material compatibility covers aluminum, low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, die steel, stainless steel, cast iron, and hardened steel.

Key Features

• 5-40 UNC thread form with H2 thread limit and 2B/3B class of fit
• Two-flute spiral point geometry pushes chips forward for use in through holes
• Vanadium high-speed steel (HSS-E) construction for wear resistance across a wide range of work materials
• Steam oxide coating reduces friction and improves lubrication retention
• Plug chamfer for standard entry and full thread engagement over the first few threads
• Right-hand thread direction; no coolant-through feature

Compatibility

Designed as an OEM-style cutting tool for through-hole 5-40 UNC threading operations in materials including aluminum, stainless steel, alloy steel, die steel, cast iron, and low-, medium-, and high-carbon steel.

Installation Notes

This tap should be installed in a compatible tap holder or CNC tapping chuck sized for a 0.141-inch shank diameter. Power down or disable the machine spindle before loading or changing tooling. Use appropriate cutting fluid for the work material — the steam oxide finish assists but does not replace proper lubrication. Follow shop-standard speeds and feeds for HSS taps in the target material; exceeding recommended parameters will accelerate wear or cause breakage.