Osg 1605038165 Thread Forming Tap 3/8-16 Unc Cobalt Ticn

Product Description

The OSG 1605038165 is a thread forming tap in the EXOPRO XPF-OIL series, designed for cold-forming internal threads without cutting or producing chips. Built from cobalt high-speed steel and coated with titanium carbonitride (TiCN), it handles demanding materials including stainless steel, titanium, high-nickel alloys, hardened steel, and aluminum. It produces 3/8-16 UNC threads to a 3B class of fit with an H5 thread limit, making it suitable for precision threaded connections in structural and mechanical assemblies. The modified bottoming chamfer — 2 to 2.5 threads — allows threading close to the bottom of blind holes. Coolant-through capability supports high-speed production tapping in CNC machining centers.

This tap is intended for blind hole threading applications across a wide range of workpiece materials, including aluminum, cast aluminum, carbon steel, alloy steel, die steel, stainless steel, high-nickel alloy, and titanium. It is appropriate for production machining environments in aerospace, automotive, and general industrial manufacturing where thread strength and dimensional accuracy are critical. The right-hand thread direction and standard shank sizing make it compatible with conventional tap holders and driven tooling systems used in CNC mills, drill presses, and tapping machines.

Key Features

• Thread forming (chipless) design eliminates chip evacuation concerns in blind holes
• Cobalt HSS construction for elevated heat resistance in tough alloys
• TiCN coating reduces friction and improves wear resistance across diverse material applications
• Modified bottoming chamfer (2 to 2.5 threads) for threading close to blind hole floors
• Coolant-through design supports high-speed and production-rate tapping
• H5 thread limit for consistent 3B class of fit in precision assemblies

Compatibility

Designed for use in blind hole threading of aluminum, cast aluminum, carbon steel, alloy steel, die steel, stainless steel, high-nickel alloy, and titanium workpieces. Compatible with standard driven tap holders accepting a 0.381-inch shank diameter with a 0.286-inch square drive.

Installation Notes

Thread forming taps require higher torque than cutting taps and must be used with a lubricant or cutting fluid rated for the workpiece material — the coolant-through feature supports this directly in CNC applications. Ensure the tap holder provides adequate torque capacity for the material being tapped and that the spindle speed matches the manufacturer recommendations for cobalt tooling in the specific material. Always confirm pilot hole diameter is sized correctly for forming taps, as forming taps require larger pilot holes than cutting taps for the same thread size. Follow applicable ASME or shop-standard tooling practices for tap replacement intervals when working with high-wear materials such as titanium or stainless steel.