Osg 1410102408 Thread Forming Tap M4x0.70 Metric Coarse

Product Description

The OSG 1410102408 is a bottoming-chamfer thread forming tap designed for M4x0.70 metric coarse internal threads in blind holes. Built from cobalt high-speed steel with a TiCN coating, it plastically displaces material rather than cutting chips, producing stronger threads with superior surface finish. The bottoming chamfer features 1 to 1.5 chamfered threads, allowing the tap to thread close to the bottom of a blind hole. Overall length is 2.126 inches (54.00 mm), with a thread length of 0.331 inches (8.40 mm) and a tapping depth of 0.772 inches (19.60 mm). It is intended for use by machinists and toolroom professionals in production and job-shop environments.

This tap is suited for blind-hole threading in a range of ferrous and non-ferrous workpiece materials, including alloy steel, carbon steel, die steel, hardened steel, stainless steel, and aluminum. The right-hand thread direction and 4H class of fit make it a standard choice for metric fastener tapping in precision components. It belongs to the OSG HY-PRO NRT series, which is designed for thread forming in ductile materials where chip-free operation is required. Typical applications include automotive, aerospace, and general manufacturing fixtures and assemblies.

Key Features

• Thread forming (chipless) action produces stronger, work-hardened threads versus cut-tap methods
• Cobalt HSS construction provides heat resistance for dry or minimal-lubrication tapping in tough alloys
• TiCN coating reduces friction and extends tool life in stainless steel and hardened steel applications
• Bottoming chamfer (1 to 1.5P) maximizes usable thread depth in blind holes
• 4H class of fit and D4 thread limit suit standard metric fastener tolerance requirements
• Right-hand thread direction; no coolant-through requirement simplifies setup

Compatibility

Designed for M4x0.70 metric coarse blind-hole threading in workpiece materials including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel, with material application codes P and N per ISO designation.

Installation Notes

Thread forming taps require a properly sized forming tap drill — the correct drill diameter for form tapping differs from standard cut-tap drill charts and must be confirmed before use. Apply appropriate tapping fluid or cutting oil for the workpiece material; cobalt taps tolerate elevated heat but lubrication extends tool life. Secure the workpiece and use a tapping attachment or CNC rigid-tapping cycle to maintain axial alignment and prevent tap breakage. Verify spindle speed and feed rate against the tap manufacturer recommendations for the specific material being tapped.