Osg 2886105 Spiral Point Tap 3/8-24 Unf Tin Hss

Product Description

The OSG 2886105 is a spiral point tap designed to cut 3/8-24 UNF right-hand internal threads in through-hole applications. It features a plug chamfer for gradual thread engagement and three flutes that push chips forward ahead of the cutting zone, keeping the hole clear during operation. Manufactured from high-speed steel (HSS) and coated with titanium nitride (TiN), this tap delivers improved wear resistance and lubricity compared to uncoated HSS tooling. With an overall length of 2.938 inches and a thread length of 0.776 inches, the 2886105 fits standard tap holders and is sized for use in manual and machine tapping setups. Installation and use are appropriate for machinist and tooling professionals working in production or maintenance environments.

This tap is suited for threading aluminum, cast aluminum, low-carbon steel, and medium-carbon steel workpieces in through-hole configurations. The spiral point design makes it well-suited for machine tapping where chip evacuation is a priority. A 2B class of fit produces standard commercial internal thread tolerance, appropriate for general fastener and assembly applications in both light manufacturing and maintenance/repair operations.

Key Features

• 3/8-24 UNF thread form with right-hand direction and 2B class of fit
• Spiral point geometry pushes chips forward, reducing chip packing in through holes
• Plug chamfer provides gradual entry and suits both hand and machine tapping
• High-speed steel construction with TiN coating for extended tool life and reduced galling
• Three flutes provide good chip clearance in softer ferrous and non-ferrous materials
• No coolant-through requirement simplifies setup in standard tapping applications

Compatibility

Rated for use in aluminum, cast aluminum, low-carbon steel, and medium-carbon steel. Compatible with standard tap holders and tapping heads that accept a 0.381-inch shank diameter. Designed for through-hole tapping only due to spiral point chip-forward action.

Installation Notes

This tap should be installed by a qualified machinist or tooling technician using a properly aligned tap holder or tapping head. Secure the workpiece firmly before tapping to prevent movement and thread distortion. Apply appropriate cutting fluid for the workpiece material before and during the tapping operation. Inspect the tap for wear or chipping before each use and replace any tap showing visible damage to the cutting edges.