Osg 1136500 Straight Flute Tap 1-12 Unf Bottoming Hss

Product Description

The OSG 1136500 is a straight flute bottoming tap designed for cutting 1-12 UNF right-hand internal threads in a range of ferrous and non-ferrous materials. Built from high-speed steel with a bright/uncoated finish, it features 4 flutes and a bottoming chamfer, making it the right choice when threads must extend to the bottom of a blind hole. At 5.125 inches overall length with a 2.5-inch thread length, this tap is sized for production and repair tapping operations on larger fastener applications. The H4 thread limit ensures consistent fit within the 3B class tolerance. Machinists and maintenance professionals use this tap in manual tapping heads, CNC rigid tapping setups, and hand-tapping operations.

This tap is suited for threading operations on aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The bottoming chamfer style makes it appropriate for through-hole finishing passes or blind holes where full thread depth close to the bottom is required. It fits standard tap holders sized for its 0.8-inch shank diameter and is part of the OSG Series 101 product family. Typical applications include machine shops, maintenance and repair operations, and production environments working with 1-inch nominal fastener holes.

Key Features

• Bottoming chamfer allows threading to the bottom of blind holes
• 4 straight flutes for chip clearance in through and blind hole applications
• High-speed steel construction provides toughness across a wide range of workpiece materials
• H4 thread limit holds 3B class of fit tolerances for consistent thread quality
• Right-hand thread direction compatible with standard tapping equipment
• Bright/uncoated finish suitable for use with cutting fluids across multiple material types

Compatibility

Designed for use in standard tap holders accepting a 0.8-inch shank diameter. Compatible with aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces. Part of the OSG Series 101 product line.

Installation Notes

This tap should be installed by a qualified machinist familiar with tapping feeds, speeds, and cutting fluid requirements for the target material. Always secure the workpiece and ensure the tap is properly aligned before engaging to prevent tap breakage or cross-threading. Use appropriate cutting fluid or tapping compound for the workpiece material. Inspect the tap for wear before each use and do not force a dull or damaged tap.