Osg 1605038247 Thread Forming Tap 3/8-24 Unf Cobalt Ticn

Product Description

The OSG 1605038247 is a thread forming tap designed for cold-forming internal threads in ductile and machinable materials without cutting. Unlike cutting taps, this tool displaces material to produce threads, resulting in stronger thread forms with no chips to evacuate. It is manufactured from cobalt high-speed steel for elevated heat and wear resistance, and carries a TiCN (titanium carbonitride) coating to reduce friction and extend tool life. The tap is configured with a modified bottoming chamfer of 2 to 2.5 threads, making it well-suited for blind hole applications where threads must extend close to the bottom of the bore. Overall length is 3.937 inches (100 mm) and thread length is 0.626 inches (16 mm).

This tap is intended for production and precision machining environments where thread integrity and tool longevity are priorities. It is suited for use in blind hole threading operations across a wide range of workpiece materials, including aluminum, cast aluminum, carbon steel, alloy steel, die steel, hardened steel, stainless steel, high-nickel alloys, and titanium. The coolant-through design supports high-speed tapping with internal coolant delivery for effective lubrication and heat management at the cutting zone. It is used by machinists, tool-and-die makers, and CNC operators in job shops, aerospace, and industrial manufacturing settings. The 3/8-24 UNF thread specification and 2B class of fit make it appropriate for fine-thread fastener assemblies requiring controlled tolerance.

Key Features

• Thread forming (chipless) design produces stronger threads and eliminates chip evacuation concerns in blind holes
• Cobalt HSS construction provides increased red hardness for tapping difficult alloys and hardened steels
• TiCN coating reduces friction and improves wear resistance across extended production runs
• Modified bottoming chamfer (2 to 2.5 threads) allows threading close to the bottom of blind bores
• Coolant-through capability supports internal flood or mist lubrication for high-speed operations
• H7 thread limit provides consistent 2B class of fit tolerance across production runs

Compatibility

Designed for blind hole thread forming in aluminum, cast aluminum, carbon steel, alloy steel, die steel, hardened steel, stainless steel, high-nickel alloys, and titanium. Part of the OSG EXOPRO XPF-OIL Series 16050 product line. Material application codes: P, M, K, N, H.

Installation Notes

This tap is installed and operated by machinists using CNC machining centers or tapping machines with synchronized spindle control. Before use, verify that the pilot hole diameter is correctly sized for thread forming to the 3/8-24 UNF specification, as forming taps require a larger pilot hole than equivalent cutting taps. Use recommended tapping fluid or activate through-spindle coolant before engaging the tap. Inspect the tap for wear or coating damage before each production run to avoid thread-quality defects.