Osg 1405009808 Thread Forming Tap 5/16-24 Unf Bottoming Ticn

Product Description

The OSG 1405009808 is a thread forming tap in the EXOTAP VP-NRT series, designed for cold-form tapping of internal threads without cutting chips. Built from powdered metal high-speed steel (PM-HSS) with a TiCN coating, it produces 5/16-24 UNF right-hand threads using a bottoming chamfer with 1 to 1.5 chamfered threads. The bottoming profile allows threading close to the bottom of blind holes. An H8 thread limit provides controlled tolerance for precision thread production. Machinists and toolroom technicians use this tap in CNC machining centers, drill presses, and tapping machines where chip-free internal threading is required.

The 1405009808 is suited for blind hole threading applications across a broad range of workpiece materials including alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. Its cold-forming action displaces material rather than cutting it, which typically results in stronger thread forms and longer tool life compared to cut taps. This makes it a practical choice for production threading in automotive, aerospace, and general machining environments where thread integrity and cycle time matter.

Key Features

• Bottoming chamfer with 1 to 1.5 chamfered threads for threading to the bottom of blind holes
• Powdered metal high-speed steel construction for improved wear resistance and toughness
• TiCN coating reduces friction and extends tool life in ferrous and non-ferrous materials
• H8 thread limit for consistent, tolerance-controlled 5/16-24 UNF thread production
• Cold-forming process eliminates chips, reducing tap breakage risk and improving thread strength
• Right-hand thread direction; no coolant-through requirement simplifies setup

Compatibility

Designed for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces. Material application codes P, M, and N. Part of OSG Series 14050 EXOTAP VP-NRT thread forming tap family.

Installation Notes

Thread forming taps require a larger pilot hole diameter than cut taps - consult OSG or standard forming tap drill charts for the correct hole size before tapping. Use a suitable tapping fluid or cutting oil appropriate to the workpiece material; forming taps generate higher torque than cut taps and lubrication is critical. Secure the workpiece firmly and ensure the tap is driven perpendicular to the work surface to avoid thread distortion. Verify tapping machine or driver torque limits before use to prevent tap breakage.