Osg 1195702 Straight Flute Tap 5/16-18 Unc Hss

Product Description

The OSG 1195702 is a straight flute tap designed to cut internal threads in pre-drilled holes. It is configured as a plug chamfer tap with a 5/16-18 UNC thread form, making it suited for general-purpose through-hole and blind-hole tapping applications. The tap is manufactured from high-speed steel, offering durability across a range of common shop materials. It carries an H3 thread limit and a 3B class of fit, delivering thread accuracy consistent with standard fastener assembly requirements. Overall length is 2-23/32 inches with a thread length of 1-1/8 inches. The 2-flute straight flute geometry aids chip evacuation in shorter threading operations. Licensed machinists and tool-and-die trades are the primary users.

This tap is intended for tapping operations in a shop or field environment across a range of ferrous and non-ferrous materials including aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. The plug chamfer style makes it appropriate for both through-holes and sufficiently deep blind holes where a starting chamfer is acceptable. It is a right-hand thread tap matched to standard right-hand fastener thread direction. The Series 104 designation identifies it within the OSG product line.

Key Features

• 5/16-18 UNC thread form with 3B class of fit for standard fastener compatibility
• H3 thread limit for consistent thread tolerance control
• Plug chamfer for versatile use in through-holes and deep blind holes
• High-speed steel construction for durability across a broad material range
• 2-flute straight flute design supports chip clearance in short-run tapping
• Right-hand thread direction matching standard fastener assemblies

Compatibility

Designed for tapping 5/16-18 UNC threads in aluminum, cast aluminum, cast iron, high-carbon steel, low-carbon steel, and medium-carbon steel workpieces as specified by the manufacturer.

Installation Notes

This tap should be used in a properly sized pilot hole matched to the 5/16-18 UNC thread specification per standard tap drill charts. Power down and secure the workpiece before beginning any tapping operation. Use appropriate cutting fluid for the workpiece material to reduce heat buildup and extend tap life. Coolant-through operation is not supported by this tool.