Osg 1625078908 Thread Forming Tap 7/8-9 Unc Cobalt Ticn

Product Description

The OSG 1625078908 is a thread forming tap designed for right-hand internal threading in a wide range of metallic workpiece materials. Part of the OSG EXOPRO XPF Series 16250, it features a 7/8-9 UNC thread profile with a 3B class of fit and an H8 thread limit for tight dimensional control. Manufactured from cobalt high-speed steel and finished with a TiCN coating, the tap is built to handle demanding applications including stainless steel, titanium, high-nickel alloys, and hardened steel. The modified bottoming chamfer, with 2.5 to 3 chamfered threads, allows threading close to the bottom of a blind hole. Licensed HVAC, plumbing, electrical, or mechanical tradespeople working with precision threaded assemblies will encounter this tool in fabrication and maintenance settings.

The OSG 1625078908 is suited for both blind hole and through-hole threading operations across a broad material range. Rated for use in aluminum, cast aluminum, carbon steel, alloy steel, die steel, stainless steel, high-nickel alloys, and titanium, it covers material application codes P, M, N, and H. With a tapping depth of 2.638 inches and a thread length of 1.11 inches, it accommodates typical structural and mechanical thread depths found in industrial and commercial fabrication. The modified bottoming chamfer makes it particularly effective in applications where full thread engagement near the base of a blind hole is required.

Key Features

• 7/8-9 UNC thread profile with 3B class of fit and H8 thread limit for precise fitment
• Cobalt high-speed steel construction for heat and wear resistance in tough alloys
• TiCN coating reduces friction and extends tool life across ferrous and non-ferrous materials
• Modified bottoming chamfer (2.5-3 chamfered threads) enables threading close to the bottom of blind holes
• Rated for aluminum, carbon steel, alloy steel, stainless steel, high-nickel alloy, and titanium
• No coolant-through design; suitable for conventional tapping setups

Compatibility

Designed for blind hole and through-hole threading applications in materials coded P, M, N, and H, including aluminum, cast aluminum, carbon steel, alloy steel, die steel, stainless steel, high-nickel alloy, and titanium. Part of the OSG EXOPRO XPF Series 16250.

Installation Notes

This tap is installed and operated by machinists or skilled tradespeople using a tapping machine, CNC machining center, or manual tap wrench rated for the required torque range. Before use, ensure the workpiece is securely fixtured and the correct pilot hole diameter for a 7/8-9 UNC thread forming tap has been drilled. Thread forming taps displace material rather than cut chips, so adequate lubrication is critical, particularly in ferrous materials. Do not use this tap as a thread cutting tap; thread forming requires a larger pilot hole than cutting taps of the same thread size.