RUKO HGB-DIN352-HSS-55° Hand Tap, BSW 1/4 inch x 20 TPI, HSS, Form A Taper Tap, DIN 352

Cutting internal Whitworth threads by hand demands a tap with the right thread form and a lead that starts squarely. The RUKO HGB-DIN352-HSS-55° hand tap meets that need for BSW 1/4 inch threads with a 55° thread angle and a taper lead that eases alignment in pre-drilled holes.

Who is it for

This tap is for machinists, maintenance technicians and metalworkers who cut or chase BSW threads in steel, cast iron and non-ferrous metals. It suits general workshop use where a DIN 352 hand tap is specified.

Main features

• Thread standard: British Standard Whitworth (BSW), 1/4 inch nominal size, 20 TPI, 55° thread angle.
• Material: High-speed steel (HSS) with bright finish.
• Lead form: Form A taper tap with 1.5–2 thread chamfer for easy starting.
• Conforms to DIN 352 for hand tap dimensions.
• Right-hand cutting direction, 3 flutes.
• Overall length 60 mm, shank diameter 6 mm, square drive 4.9 mm.
• Recommended pilot hole diameter: 5.1 mm.

Specifications

• Tool type: Hand tap
• Thread standard: BSW
• Nominal thread size: 1/4 inch
• Thread pitch: 20 TPI
• Thread angle: 55°
• Material: HSS
• Lead form: Form A (taper tap)
• Overall length: 60 mm
• Shank diameter: 6 mm
• Square drive size: 4.9 mm
• Recommended pilot hole: 5.1 mm
• Number of flutes: 3
• Cutting direction: Right-hand

Tips

Use a suitable cutting fluid and reverse the tap periodically to break chips. For through holes, follow with a plug tap to finish threads to the bottom.