Osg 1400131400 Thread Forming Tap 5/16-18 Unc Plug Cobalt

Product Description

The OSG 1400131400 is a thread forming tap in the HY-PRO NRT series, designed for cold-forming internal threads without cutting or producing chips. Operating on a 5/16-18 UNC thread standard with a plug chamfer, this tap displaces material rather than removing it, resulting in stronger threads and a cleaner hole. Built from cobalt high-speed steel with a bright finish, it carries an H3 thread limit and is suited for right-hand threading in through-hole applications. Overall length is 2.719 inches with a tapping depth of 1.126 inches. Machinists and tool-and-die technicians install this tap in CNC machining centers, drill presses, and tapping machines.

This tap is engineered for through-hole threading in a broad range of metals. Rated for use in alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum, it performs well across both ferrous and non-ferrous applications. The plug chamfer with 4 to 4.5 chamfered threads makes it well suited for starting a thread in a pre-drilled through hole. Typical applications include production threading in manufacturing environments, machine shops, and maintenance and repair operations where thread integrity and hole strength are critical.

Key Features

• Thread forming design displaces material rather than cutting, producing stronger threads with no chips
• Cobalt high-speed steel construction provides heat resistance and durability in harder workpiece materials
• H3 thread limit ensures consistent fit and gauge compliance for 5/16-18 UNC threads
• Plug chamfer with 4 to 4.5 chamfered threads allows easy entry in through-hole setups
• Right-hand thread direction compatible with standard tapping equipment and CNC programs
• Bright finish with no coolant-through requirement simplifies setup in standard machine configurations

Compatibility

Designed for through-hole threading applications in alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum workpieces requiring a 5/16-18 UNC right-hand thread.

Installation Notes

This tap is installed by machinists and tooling technicians using a tapping machine, CNC machining center, or drill press with a tapping attachment. Ensure the pilot hole is drilled to the correct diameter for thread forming before use, as forming taps require a larger pilot hole than cutting taps. Use a lubricant or tapping fluid rated for the workpiece material to reduce friction and extend tap life. Secure the tap firmly in a chuck or holder to prevent slippage and ensure proper thread alignment.