RUKO HGB DIN 5157 HSS 55° Rp 1/8 handgewindetap

Machinists and maintenance technicians use this hand tap to cut internal parallel pipe threads (Rp 1/8) in unalloyed and alloyed steels up to 800 N/mm², malleable cast iron, non-ferrous metals, and plastics. The tap is built from high-speed steel (HSS) with a 55° flank angle, matching DIN 5157 for British Standard Pipe Parallel threads.

Key specifications

• Thread standard: DIN 5157
• Thread type: Rp (British Standard Pipe Parallel)
• Nominal thread size: 1/8 inch
• Flank angle: 55°
• Material: HSS (High-Speed Steel)
• Threads per inch (TPI): 28
• Overall length: 60 mm
• Thread length: 18 mm
• Shank diameter: 7.0 mm
• Square drive size: 5.5 mm
• Recommended core hole diameter: 8.5 mm
• Cutting direction: Right-hand

Why choose it

The HSS construction provides good wear resistance and cutting performance in a range of materials. The 55° flank angle and DIN 5157 geometry ensure accurate threads for parallel pipe connections.

Ideal use cases

• Creating internal Rp 1/8 threads for pipe fittings
• Threading in steel, cast iron, non-ferrous metals, and plastics
• Workshop and maintenance applications requiring parallel pipe threads

Good to know

The tap is designed for right-hand cutting. Use the recommended core hole diameter of 8.5 mm for proper thread engagement. Suitable for materials up to 800 N/mm² tensile strength.