Osg 1635008259 Thread Forming Tap M8x1.25 Metric Coarse

Product Description

The OSG 1635008259 is a thread forming tap designed for M8x1.25 metric coarse threading in blind and through-hole applications. Unlike cutting taps, thread forming taps displace material rather than cut it, producing stronger threads with no chips. This tap features a modified bottoming chamfer with 2.5 to 3 chamfered threads, a 6H class of fit, and a D9 thread limit. It is manufactured from cobalt high speed steel and finished with a TiCN coating for extended tool life in demanding materials. Overall length is 3.54 inches with a thread length of 0.47 inches and a tapping depth of 1.38 inches. Licensed machinists and tool room technicians install this tap in production and maintenance environments.

The OSG 1635008259 is suited for blind hole and through-hole threading operations across a broad range of materials including aluminum, cast aluminum, carbon steel, alloy steel, die steel, stainless steel, hardened steel, high-nickel alloy, and titanium. The modified bottoming chamfer allows threading closer to the bottom of blind holes than a standard plug chamfer. It is part of the OSG EXOPRO XPF Series 16350, a line engineered for forming internal threads in both ferrous and non-ferrous workpieces in shop and production settings.

Key Features

• Thread forming design displaces material for chip-free, stronger threads
• TiCN coating improves wear resistance and tool life across hard and abrasive materials
• Modified bottoming chamfer with 2.5 to 3 chamfered threads for closer blind-hole threading
• Cobalt high speed steel construction handles hardened steel, stainless, titanium, and high-nickel alloys
• Right-hand thread direction, 6H class of fit, D9 thread limit for standard metric tolerance
• Compatible with both blind hole and through-hole threading operations

Compatibility

Designed for M8x1.25 metric coarse thread forming in blind and through-hole applications across aluminum, cast aluminum, carbon steel, alloy steel, die steel, stainless steel, hardened steel, high-nickel alloy, and titanium workpieces. Part of the OSG EXOPRO XPF Series 16350.

Installation Notes

Thread forming taps require a properly sized forming hole diameter, which is larger than a standard tap drill size — consult the OSG Series 16350 forming drill chart for the correct hole preparation diameter before use. Power down and secure all machinery before tap installation or changeout. Use appropriate tapping fluid or cutting oil matched to the workpiece material, particularly when working with stainless steel or high-nickel alloys. Follow shop safety protocols and machine tool manufacturer guidelines for spindle speed and feed rate when running thread forming operations.