Osg 1625014286 Thread Forming Tap 1/4-28 Unf Cobalt Ticn

Product Description

The OSG 1625014286 is a thread forming tap designed for cold-forming internal threads in ductile metals without cutting or producing chips. Manufactured from cobalt high-speed steel and finished with a TiCN coating, this tap delivers extended tool life in demanding materials including stainless steel, titanium, high-nickel alloys, and hardened steels. It produces a 1/4-28 UNF right-hand thread to a 2B class of fit with an H6 thread limit. The modified bottoming chamfer, with 2.5 to 3 chamfered threads, allows threading close to the bottom of blind holes. Overall length is 3.1496 inches (80 mm). This tap belongs to OSG EXOPRO XPF Series 16250 and is intended for use by machinists and tooling professionals in production or maintenance environments.

This tap is suited for blind-hole and through-hole threading applications across a broad range of materials: aluminum, cast aluminum, carbon steel, alloy steel, die steel, hardened steel, stainless steel, high-nickel alloy, and titanium. Its cold-forming action displaces material rather than cutting it, resulting in stronger thread forms with work-hardened surfaces. It is commonly used in CNC machining centers, manual mills, and tapping machines where chip management is a concern or where thread strength is critical.

Key Features

• Thread size 1/4-28 UNF, right-hand, 2B class of fit with H6 thread limit
• Cobalt HSS construction for heat and wear resistance in hard and abrasive materials
• TiCN coating reduces friction and extends tool life across a wide material range
• Modified bottoming chamfer (2.5 to 3 chamfered threads) for near-bottom blind hole threading
• Cold-forming operation eliminates chips and produces stronger, work-hardened threads
• Compatible with both blind-hole and through-hole threading applications

Compatibility

Designed for use in aluminum, cast aluminum, carbon steel, alloy steel, die steel, hardened steel, stainless steel, high-nickel alloy, and titanium workpieces (material application codes P, M, N, H). Suitable for blind-hole and through-hole threading operations.

Installation Notes

This tap is installed by machinists using a standard tap holder, tapping head, or CNC rigid tapping cycle. Before use, verify the pilot hole diameter matches the required thread forming drill size for 1/4-28 UNF, as the correct hole size is critical for cold-forming taps and differs from cutting tap requirements. Use appropriate tapping fluid or cutting oil for the workpiece material to reduce tool stress and heat buildup. Do not use in materials that lack sufficient ductility, as brittle materials are not compatible with thread forming operations.