Osg 1221200 Spiral Point Tap 5/16-24 Unf Plug Hss

Product Description

The OSG 1221200 is a spiral point plug tap designed for threading 5/16-24 UNF internal threads in a wide range of ferrous and non-ferrous materials. Built from high-speed steel with a bright finish, this tap is suited for production and maintenance threading operations where consistent thread quality and tool durability are required. The spiral point geometry pushes chips forward ahead of the tap, making it well-suited for through-hole applications. With 2 flutes and an H1 thread limit, it holds tight tolerances appropriate for standard UNF fastener fits. Overall length is 2.719 inches with a thread length of 0.724 inches and a shank diameter of 0.318 inches.

This tap is used in machine shop, maintenance, repair, and fabrication environments where 5/16-24 UNF through-hole threading is required. Suitable for use in drill presses, CNC machining centers, and tapping machines. Material compatibility includes aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel, making it a versatile choice across general metalworking applications. It is a right-hand cut tap and does not require coolant-through tooling setups.

Key Features

• Spiral point design pushes chips forward, ideal for through-hole threading
• High-speed steel construction provides durability across a broad range of workpiece materials
• H1 thread limit for controlled tolerance fits on standard UNF fasteners
• Bright finish with no coating for straightforward tool identification and general-purpose use
• Right-hand cut, 2-flute configuration suited for machine tapping operations
• No coolant-through requirement simplifies setup on standard equipment

Compatibility

Designed for threading 5/16-24 UNF through-holes in aluminum, cast aluminum, cast iron, low-carbon steel, medium-carbon steel, high-carbon steel, and hardened steel workpieces.

Installation Notes

Install in a rigid or floating tap holder appropriate for the machine being used; avoid hand-tapping in applications where thread accuracy is critical. Power down or de-energize the machine and secure the workpiece before loading the tap. Follow shop standard feeds and speeds for high-speed steel tooling based on workpiece material. Inspect the tap for wear or chipping before each use to prevent thread damage or tap breakage.