Osg 1100700 Straight Flute Tap 5/16-18 Unc Plug Hss

Product Description

The OSG 1100700 is a straight flute plug tap designed for cutting 5/16-18 UNC right-hand internal threads in a range of ferrous and non-ferrous materials. Built from high-speed steel with a bright uncoated finish, this tap delivers reliable thread form in general-purpose machine tapping and hand tapping applications. It carries an H1 thread limit for close-tolerance work and features 4 flutes to provide adequate chip clearance in through-hole and shallow blind-hole applications. Overall length is 2-23/32 inches with a thread length of 1-1/8 inches, making it suited to standard tapping depths in production and maintenance environments.

This tap is intended for use in machine shops, maintenance facilities, and production lines where 5/16-18 UNC threads are required. The plug chamfer - typically 3 to 5 threads of lead - positions it as the standard choice when starting a thread in a pre-drilled hole and running it through or to a moderate depth. Material applications include aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel, covering the most common workpiece materials encountered in general machining and fabrication.

Key Features

• 5/16-18 UNC thread form, right-hand direction
• Plug chamfer for standard through-hole and moderate blind-hole tapping
• 4 straight flutes for chip clearance in a wide range of materials
• H1 thread limit for close-tolerance thread fit
• High-speed steel construction for durability across ferrous and non-ferrous workpieces
• Bright uncoated finish compatible with cutting oils and standard tapping fluids

Compatibility

Designed for tapping 5/16-18 UNC threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces using standard tapping equipment.

Installation Notes

This tap is installed by machinists and maintenance technicians using a tap wrench, tapping head, or CNC tapping cycle. Always use an appropriately sized pilot hole per UNC tap drill charts before tapping. Apply a suitable cutting fluid or tapping compound for the workpiece material to extend tool life and improve thread quality. Secure the workpiece firmly and ensure the tap enters the hole square to avoid thread damage or breakage.