Osg 1400141300 Thread Forming Tap 7/16-20 Unf Cobalt

Product Description

The OSG 1400141300 is a thread forming tap designed for 7/16-20 UNF right-hand threads, built from cobalt high-speed steel with a bright finish. Unlike cutting taps, thread forming taps displace material rather than cut it, producing stronger threads with no chips to clear. This tap uses a modified bottoming chamfer with 2 to 2.5 chamfered threads, allowing it to thread close to the bottom of blind holes. The overall length is 3.156 inches with a thread length of 0.858 inches and a shank diameter of 0.323 inches. It belongs to OSG's HY-PRO NRT Series 14001 and carries a Thread Limit of H8. Licensed machinists and tool-and-die technicians are the primary users.

This tap is suited for blind hole threading applications in a range of ferrous and non-ferrous materials including alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. The cobalt construction handles the elevated heat and tool pressure that come with tougher alloys. It is a common choice in production machining, maintenance repair, and tool-and-die shops where 7/16-20 UNF internal threads are required in challenging workpiece materials. Coolant-through is not supported on this tap.

Key Features

• Thread forming (chipless) design produces stronger threads and eliminates chip evacuation concerns in blind holes
• Modified bottoming chamfer with 2 to 2.5 chamfered threads for threading close to hole bottom
• Cobalt high-speed steel construction for durability in alloy steel, stainless steel, and hardened steel
• H8 thread limit for controlled fit in 7/16-20 UNF applications
• Bright finish with no coating to alter base tool geometry
• Right-hand thread direction, standard for UNF fastener applications

Compatibility

Designed for blind hole thread forming in 7/16-20 UNF applications across material codes P and N, covering alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum workpieces.

Installation Notes

Thread forming taps require a specific forming tap drill size, which differs from standard tap drill charts used for cutting taps — consult OSG or a forming tap drill chart before drilling the pilot hole. Secure the workpiece and use a tapping fluid or cutting oil appropriate for the workpiece material before tapping. Ensure the tap is driven straight and at consistent speed to avoid galling, particularly in stainless steel. This tap is intended for use by qualified machinists with appropriate tapping equipment.