Osg 1226800 Spiral Point Tap 3/8-24 Unf Plug Hss

Product Description

The OSG 1226800 is a spiral point tap designed for cutting 3/8-24 UNF right-hand internal threads in a wide range of metals. The spiral point geometry pushes chips forward ahead of the tap, preventing chip packing in through-hole applications. Built from high-speed steel with a bright uncoated finish, this plug chamfer tap features 3 flutes and an H2 thread limit for controlled fit tolerances. It measures 2.938 inches overall length with a 0.787 inch thread length and a 0.381 inch shank diameter. This tap is installed by machinists, maintenance technicians, and tooling professionals working on production or repair operations.

The OSG 1226800 is suited for through-hole tapping in residential, commercial, and industrial settings. Its material application range includes aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel. The plug chamfer provides a gradual lead-in, making it appropriate for both machine tapping and hand tapping operations where the hole passes fully through the workpiece.

Key Features

• Spiral point design pushes chips forward for clean through-hole tapping
• 3/8-24 UNF thread form with right-hand thread direction
• H2 thread limit for consistent, controlled fit tolerances
• High-speed steel construction handles a broad range of ferrous and non-ferrous materials
• Plug chamfer for gradual thread engagement and reduced tap breakage risk
• Bright uncoated finish — no coating interference with tight tolerance fits

Compatibility

Designed as an OEM-style threading tool for any application requiring a 3/8-24 UNF right-hand internal thread in through-hole workpieces across compatible materials including aluminum, cast iron, and low- through high-carbon steels.

Installation Notes

Install and use this tap with a properly aligned tapping head, drill press, or CNC machine to avoid tap breakage from misalignment. Ensure the pilot hole is drilled to the correct tap drill diameter for 3/8-24 UNF before tapping. Use appropriate cutting fluid for the material being tapped to extend tool life and improve thread finish. Secure the workpiece fully before operation and confirm spindle speed is appropriate for the material and tap size.