Osg 1121902 Straight Flute Tap 7/16-14 Unc Plug Hss

Product Description

The OSG 1121902 is a straight flute plug tap designed for cutting 7/16-14 UNC right-hand threads in a range of ferrous and non-ferrous materials. Built from high-speed steel, it delivers the wear resistance needed for production tapping in machine shop and maintenance environments. The plug chamfer - typically 3 to 5 threads - starts the tap easily in through-holes and blind holes with sufficient depth clearance. With 4 flutes and an H3 thread limit, it holds tight tolerances suitable for standard fastener fits. Overall length is 3-5/32 inches with a 1-7/16 inch thread length. Licensed machinists, toolroom technicians, and maintenance mechanics are the primary users.

This tap is suited for tapping operations in both manual and CNC machine setups. The H3 limit and straight flute geometry make it a reliable choice for short-chipping materials. Compatible material applications include aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel. It is sold individually and well-suited for job shop, production floor, and field maintenance use where 7/16-14 UNC threads are required.

Key Features

• 7/16-14 UNC thread form with right-hand thread direction
• Plug chamfer for easy starting in through-holes and adequate-depth blind holes
• 4 straight flutes with H3 thread limit for consistent tolerance control
• High-speed steel construction for durability across a broad range of workpiece materials
• 1-7/16 inch thread length allows full-depth engagement in standard applications
• No coolant-through requirement - compatible with flood or manual lubrication

Compatibility

Designed for tapping 7/16-14 UNC threads in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, and high-carbon steel workpieces.

Installation Notes

This tap is installed by a machinist or maintenance technician using a tap wrench, tapping head, or CNC rigid tapping cycle. Always ensure the workpiece is securely fixtured and the tap is properly aligned to the drilled hole centerline before engagement. Use an appropriate cutting fluid for the workpiece material to extend tool life and improve thread quality. Follow shop safety practices and applicable OSHA machine guarding requirements when operating drilling or tapping equipment.