RUKO HGB-DIN5157-HSS-55°-Rp-1/8 Pipe Thread Tap

Machinists and pipe fitters use the RUKO HGB-DIN5157-HSS-55°-Rp-1/8 tap to cut clean internal parallel pipe threads in steel, cast iron, non-ferrous metals, and plastics. Its ground HSS-G profile and 55° thread angle follow DIN 5157, making it suitable for Whitworth pipe connections where a tight, leak-resistant joint is required.

Key specifications

• Thread standard: DIN 5157
• Thread type: Rp (internal parallel pipe thread)
• Nominal thread size: 1/8 inch
• Thread pitch: 28 TPI
• Thread angle: 55°
• Material: HSS-G (high-speed steel, ground)
• Overall length: 62 mm
• Thread length: 18 mm
• Shank diameter: 7 mm
• Square drive size: 5.5 mm
• Cutting direction: right-hand
• Number of flutes: 4
• Surface finish: bright
• Tolerance class: ISO 7-1

Why choose it

The ground flute profile reduces cutting forces and improves chip evacuation, extending tool life in production environments. The bright finish resists corrosion during storage and provides a clean surface for thread cutting.

Ideal use cases

• Cutting internal parallel pipe threads in fittings and manifolds
• Repairing damaged threads in cast iron or steel pipe components
• Creating Whitworth pipe threads for pneumatic or hydraulic systems

Good to know

This tap conforms to DIN 5157 for parallel pipe threads and is suitable for use with a tap wrench or machine holder. For through holes, a spiral point tap may be more efficient, but this straight-flute design works well in both blind and through holes.