Osg 1302000201 Spiral Flute Tap 8-32 Unc Hss Oxide

Product Description

The OSG 1302000201 is a spiral flute plug tap designed for cutting 8-32 UNC internal threads in a wide range of ferrous and non-ferrous materials. Made from high-speed steel with a steam oxide coating, it features a 45-degree helix angle and three right-hand flutes that lift chips up and out of the hole during tapping. This geometry makes it well suited for through-hole and blind-hole applications where chip evacuation is critical. The plug chamfer provides a gradual lead-in, distributing cutting load across several threads. Overall length is 2.125 inches with a thread length of 0.251 inches. Licensed machinists, tool-and-die makers, and maintenance technicians are the primary users of this tap.

This tap is sized for 8-32 UNC threads and carries a 2B class of fit, which is the standard tolerance for general-purpose unified inch fastener assemblies. The H3 thread limit indicates a controlled oversize that accounts for material spring-back and coating buildup, making it appropriate for tapping aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. It is part of the OSG Series 13020 spiral flute tap line and is sold individually.

Key Features

• 45-degree helix angle promotes efficient chip evacuation in through and blind holes
• High-speed steel construction provides strength and wear resistance across a broad material range
• Steam oxide coating reduces friction and offers light corrosion resistance during storage and use
• Plug chamfer distributes cutting load gradually for smoother thread formation
• H3 thread limit suits standard 2B class of fit requirements
• Right-hand flute direction and right-hand thread — compatible with standard tap wrenches and CNC tapping cycles

Compatibility

Designed for cutting 8-32 UNC right-hand internal threads with a 2B class of fit in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. Coolant-through is not supported.

Installation Notes

A licensed machinist or qualified maintenance technician should select the correct tap drill size per ASME B1.1 tables before use. Always secure the workpiece and ensure the tap is aligned perpendicular to the drilled hole before beginning the tapping cycle. When using in a manual tap wrench, apply cutting fluid appropriate for the workpiece material and back off periodically to break chips. On CNC equipment, verify spindle speed and feed rate match the tap manufacturer recommendations for the specific material being tapped.