Tap FANAR GWINTOWNIK UNC 3/8-16 DIN-371B (2B) HSSE 800

FANAR GWINTOWNIK UNC 3/8-16 DIN-371B (2B) HSSE 800 is a machine tap for cutting external UNC threads with nominal size 3/8-16. Manufactured to DIN-371B dimensions and specified for 2B tolerance class, this tap is produced from HSSE 800 high-speed steel with cobalt to provide improved wear resistance during repeated machining operations. It is intended for precision threading in various metal materials and for use in production machining and tool room environments.

Advantages

The HSSE 800 material with cobalt increases hardness and thermal stability compared to conventional high-speed steels, enabling longer tool life and consistent thread quality. Conformance to DIN-371B ensures dimensional accuracy for UNC 3/8-16 threads, while the 2B tolerance class provides the standard internal thread fit expected in commercial assemblies. The design is suitable for machine tapping operations, delivering reliable thread geometry and repeatable performance.

Suitable for

• Precision machining of external UNC 3/8-16 threads on metal workpieces
• Production environments requiring consistent thread tolerances
• Tool rooms and maintenance shops performing machine tapping
• Applications where improved wear resistance is required

Key specifications

• Thread form: UNC (Unified National Coarse)
• Nominal size: 3/8-16
• Standard: DIN-371B (machine tap dimensions)
• Tolerance class: 2B (internal thread fit)
• Material: HSSE 800 (high-speed steel with cobalt)
• Intended use: machine tapping of external threads

How to use

Mount the tap securely in an appropriate machine tool or tapping holder designed for external tapping. Align the tap with the workpiece axis to ensure correct engagement and feed at the recommended spindle speeds for the material being machined. Use appropriate cutting fluid or coolant compatible with the workpiece material to reduce friction and control temperature. Monitor thread quality and tool wear; replace the tap when wear affects thread form or dimensional accuracy.

Usage recommendations

For best results, select cutting speeds and feeds based on the workpiece material and tap diameter, and use a lubricant suitable for HSSE tools. When tapping ductile materials, ensure chip evacuation to prevent clogging; for harder alloys, reduce cutting speed to extend tool life.