Osg 1171600 Straight Flute Tap 3/8-24 Unf Plug 3B Hss

Product Description

The OSG 1171600 is a straight flute tap designed to cut internal threads in a range of ferrous and non-ferrous materials. It produces a 3/8-24 UNF right-hand thread to a 3B class of fit, making it suitable for applications that require a standard tolerance internal thread. The tap features three flutes, a plug chamfer for general-purpose through-hole and blind-hole tapping, and an H3 thread limit for consistent sizing. Manufactured from high-speed steel with a bright uncoated finish, it is a reliable choice for production and maintenance machining operations.

This tap is intended for hand or machine tapping in materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. It is well suited to general metalworking shops, maintenance and repair operations, and production environments where 3/8-24 UNF threaded holes are required. The plug chamfer makes it a versatile starting point for most tapping scenarios, providing a gradual thread lead-in that distributes cutting forces across several teeth.

Key Features

• 3/8-24 UNF thread form with right-hand thread direction
• 3B class of fit and H3 thread limit for standard tolerance control
• Plug chamfer for use in through holes and accessible blind holes
• Three-flute geometry for chip management in a range of workpiece materials
• High-speed steel construction with bright uncoated finish
• No coolant-through feature; suitable for conventional flood or manual lubrication

Compatibility

Designed for tapping 3/8-24 UNF threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. Part of OSG Series 103.

Installation Notes

Install in a tap wrench, tapping head, or CNC spindle with the appropriate 3/8 square drive or shank chuck. Ensure the workpiece is securely clamped and the tap is aligned perpendicular to the drilled hole before applying cutting pressure. Apply a suitable cutting fluid for the workpiece material to extend tap life and improve thread finish. Power down or disengage the machine before removing the tap from a blind hole to avoid breakage.