Osg 1400109000 Thread Forming Tap 5-44 Unf Cobalt

Product Description

The OSG 1400109000 is a thread forming tap in the HY-PRO NRT series, designed for cold-forming internal threads without cutting chips. It produces a 5-44 UNF right-hand thread using a modified bottoming chamfer with 2 to 2.5 chamfered threads, making it suitable for threading close to the bottom of blind holes. Built from cobalt high-speed steel with a bright finish, this tap carries a H4 thread limit and is intended for use by machinists and tooling technicians in precision metalworking environments. Overall length is 1.938 inches with a tapping depth of 0.626 inches.

This tap is rated for blind hole threading applications across a range of workpiece materials including alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel. The modified bottoming chamfer allows threading deeper into blind holes compared to standard plug chamfer taps, making it a practical choice for close-tolerance fastener holes in machined components, fixtures, and tooling assemblies. It is suited to CNC tapping centers, drill presses, and manual tapping operations where 5-44 UNF thread production is required.

Key Features

• Thread forming (chipless) design eliminates chip evacuation concerns in blind holes
• Modified bottoming chamfer (2 to 2.5 threads) for threading near the bottom of a blind hole
• Cobalt high-speed steel construction for improved heat and wear resistance in tough materials
• H4 thread limit for controlled fit in precision threaded assemblies
• Right-hand, 5-44 UNF thread form at 44 threads per inch
• No coolant-through requirement; compatible with flood or manual lubrication

Compatibility

Designed for blind hole threading in alloy steel, aluminum, carbon steel, die steel, hardened steel, and stainless steel workpieces requiring a 5-44 UNF internal thread. Material application codes P and N apply.

Installation Notes

Installation should be performed by a qualified machinist following standard tapping practices. Ensure the workpiece is securely fixtured and that the tap is properly aligned axially before engagement to prevent tap breakage in small-diameter threads. Use a cutting or forming fluid appropriate for the workpiece material to reduce heat and extend tool life. Because this is a forming tap, the pilot hole diameter must be sized to the thread-forming specification rather than a standard drill chart for cut taps.