Tap FANAR GWINTOWNIK BSW 1/4-20 NGWB/3 DIN-352 HSS — threading tap, BSW 1/4-20

FANAR GWINTOWNIK BSW 1/4-20 NGWB/3 DIN-352 HSS is a single-thread cutting tap made of high-speed steel (HSS) designed to produce internal BSW (British Standard Whitworth) threads in size 1/4-20. Built to DIN 352 dimensional and tolerance guidelines, the NGWB/3 geometry and flute design are intended for cutting and finishing operations in metalworking. The tool is suitable for both hand tapping and machine tapping in workshop and repair environments and is compatible with common tap holders and tapping fixtures.

Advantages

The HSS material provides wear resistance and toughness for repeated use on steels and general-purpose materials. Compliance with DIN 352 ensures consistent thread form and dimensions when used with appropriate settings and lubrication. The NGWB/3 flute geometry balances chip evacuation and cutting edge support to reduce jamming in through and blind holes when used correctly.

Suitable for

• Cutting and finishing BSW 1/4-20 internal threads in metal components
• Workshop maintenance and repair tasks requiring Whitworth threads
• Small series component manufacturing and assembly with BSW thread requirements
• Hand tapping and machine tapping in conventional and benchtop equipment

Key specifications

• Thread standard: BSW (British Standard Whitworth)
• Thread size: 1/4-20
• Material: High-speed steel (HSS)
• Design standard: DIN 352
• Type/geometry: NGWB/3 flute configuration
• Application: Internal threading (tap)

How to use

Select an appropriately sized drill to prepare the hole before tapping, following standard BSW tap drill recommendations. Secure the workpiece and use cutting fluid or suitable lubrication for the work material. For hand tapping, start the tap square to the hole and advance with controlled turns, reversing occasionally to break chips. For machine tapping, set correct spindle speed and feed, use a rigid holder or collet, and ensure alignment to avoid cross-threading. After completing the thread, withdraw the tap while cleaning chips from flutes and inspect the thread for form and fit.

Usage recommendations

Use cutting fluid when threading steels and tougher alloys to extend tool life and improve surface finish. For blind holes, periodically back the tap to clear chips. Inspect the tap for wear or damage before use and replace it if cutting edges are rounded or chipped. Match tap drill size and thread class to the intended fit and tolerance for best results.