Osg 2886000 Spiral Point Tap 3/8-16 Unc 3 Flute Hss

Product Description

The OSG 2886000 is a spiral point plug tap designed for threading through-holes in a range of common metals. It cuts a 3/8-16 UNC right-hand internal thread to a 2B class of fit, with an H3 thread limit for controlled tolerance. Made from high speed steel with a bright finish, this three-flute tap drives chips forward ahead of the cutting zone, which makes it well suited for through-hole applications where chip evacuation is critical. Overall length is 2.938 inches with a thread length of 1.25 inches. Licensed machinists, tool and die makers, and maintenance technicians are the typical users.

This tap is rated for use in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. It fits standard CNC tapping heads, hand tap wrenches, and tapping attachments that accept a 0.381-inch shank diameter. The plug chamfer with 3-5 lead threads makes thread starting straightforward in production and repair tapping operations on through-hole workpieces.

Key Features

• 3/8-16 UNC thread form, right-hand cut, 2B class of fit
• H3 thread limit for consistent tolerance control
• Spiral point geometry pushes chips forward, ideal for through-holes
• High speed steel construction handles aluminum and low-to-medium carbon steel
• Plug chamfer provides easy thread entry without requiring a starter tap
• Bright finish — no coating that could affect thread tolerance

Compatibility

Rated for use in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. Fits standard tap holders and wrenches accepting a 0.381-inch shank. Intended for through-hole applications requiring a 3/8-16 UNC 2B internal thread.

Installation Notes

Always secure the workpiece firmly and ensure the tap is aligned perpendicular to the drilled hole before starting. Power down or de-energize any CNC or powered tapping equipment before changing tooling. Use the appropriate cutting fluid for the material being tapped — dry tapping in steel is not recommended. Follow shop safety practices and applicable OSHA machine guarding requirements when operating tapping equipment.