Osg 1605056187 Thread Forming Tap 5/16-18 Unc Cobalt Ticn

Product Description

The OSG 1605056187 is a thread forming tap designed for producing internal threads without cutting, using material displacement to create strong, chip-free threads. Part of the OSG EXOPRO XPF-OIL Series 16050, it is configured in 5/16-18 UNC with a 2B class of fit and a modified bottoming chamfer of 2 to 2.5 threads. The tap is constructed from cobalt high-speed steel and coated with TiCN for extended wear resistance and thermal stability. Overall length is 3.54 inches (90 mm) with a thread length of 0.56 inches and a tapping depth of 1.38 inches. A coolant-through design supports high-production machining environments. Thread limit is H7 with right-hand thread direction.

This tap is suited for blind-hole threading applications across a wide range of materials including aluminum, cast aluminum, carbon steel, alloy steel, die steel, hardened steel, stainless steel, high-nickel alloy, and titanium. It is applicable to material codes P, M, K, N, and H, covering the majority of ferrous and non-ferrous workpiece categories encountered in production machining, tool and die work, and precision fabrication. The modified bottoming chamfer allows threading close to the bottom of blind holes where standard or plug chamfer taps cannot reach.

Key Features

• Thread forming (chipless) design eliminates chip evacuation concerns in blind holes
• Cobalt HSS construction provides toughness and heat resistance for demanding materials
• TiCN coating extends tool life and reduces galling in stainless steel and high-nickel alloys
• Coolant-through capability supports high-speed, high-production tapping cycles
• Modified bottoming chamfer with 2 to 2.5 thread lead allows threading to near-bottom in blind holes
• H7 thread limit ensures consistent fit tolerance across production runs

Compatibility

Designed for blind-hole thread forming in materials including aluminum, cast aluminum, carbon steel, alloy steel, die steel, hardened steel, stainless steel, high-nickel alloy, and titanium. Produces 5/16-18 UNC 2B class-of-fit threads and is compatible with standard 5/16-18 tapping fixtures and CNC tapping cycles that support right-hand thread forming taps.

Installation Notes

Thread forming taps require a slightly larger pilot hole diameter than cutting taps — consult the OSG Series 16050 recommended drill chart for the correct forming drill size before setup. Power down and lock out all machine spindles before changing or inspecting tooling per standard lockout/tagout procedures. Apply appropriate tapping fluid or use the coolant-through feature with a compatible cutting fluid rated for the workpiece material. Do not use this tap for thread cutting applications; thread forming taps are not interchangeable with thread cutting taps.