Osg 1136800 Straight Flute Tap 1-14 Uns Bottoming Hss

Product Description

The OSG 1136800 is a straight flute bottoming tap designed for cutting 1-14 UNS internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with a bright/uncoated finish, this tap features 4 flutes and a bottoming chamfer, making it well suited for threading holes that require full thread depth close to the bottom. It carries a 3B class of fit and an H4 thread limit, delivering consistent dimensional control for precision threaded assemblies. With an overall length of 5.125 inches and a thread length of 2.5 inches, this tap is sized for standard machine tapping applications. A shank diameter of 0.8 inches and a square size of 0.6 inches allow secure chuck or holder engagement.

This tap is intended for use in machine tapping operations on aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel. It follows the OSG Series 101 specification and is a right-hand thread tool. Typical applications include production tapping on CNC machining centers, drill presses, and tapping heads where a bottoming chamfer is required to achieve full thread engagement near the bottom of a blind hole.

Key Features

• Bottoming chamfer for threading close to the bottom of blind holes
• 4 straight flutes for chip management in a variety of materials
• H4 thread limit for consistent 3B class-of-fit tolerances
• High-speed steel construction for durability across ferrous and non-ferrous workpieces
• Right-hand thread cutting, 1-14 UNS thread form
• Bright/uncoated finish compatible with standard cutting fluids

Compatibility

Designed as an OEM-style replacement or direct production tap for machine tapping setups requiring a 1-14 UNS bottoming tap with a 3B class of fit. Suitable for use in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel per OSG Series 101 application guidelines.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Power down or lock out the machine spindle before loading or changing taps. Secure the tap firmly in a tapping chuck or holder rated for the shank diameter before operation. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain thread quality.