RUKO HGB DIN 5157 HSS 55° Rp 1/4 paralelný rúrkový závitník

This RUKO hand tap is engineered for cutting parallel internal pipe threads to DIN 5157, a standard for non-pressure-tight connections. Unlike tapered pipe taps, the Rp thread form ensures a mechanical fit without relying on thread deformation for sealing, making it the right choice for applications where a straight, precise thread is required. The 55° flank angle and 19 TPI pitch match the British Standard Pipe Parallel specification, ensuring compatibility with Rp 1/4 fittings.

Highlights

• Thread standard: DIN 5157 / ISO 7-1 / EN 10226-1
• Nominal size: Rp 1/4 (parallel internal pipe thread)
• Material: High-speed steel (HSS) for durability
• Four flutes for efficient chip evacuation
• Right-hand cutting direction

In daily use

The tap's HSS construction holds an edge across a range of materials, including steel, cast iron, and non-ferrous metals. The bright surface treatment reduces friction during threading, while the 5.5 mm square drive fits standard tap wrenches. With a thread length of 22 mm and an overall length of 60 mm, it reaches into fittings without excessive projection.

Full specifications

• Thread type: Rp (parallel internal pipe thread)
• Nominal thread size: 1/4"
• Thread standard: DIN 5157 / ISO 7-1 / EN 10226-1
• Material: HSS (high-speed steel)
• Flank angle: 55°
• Thread pitch: 19 TPI
• Cutting direction: Right-hand
• Tool type: Hand tap
• Number of flutes: 4
• Overall length: 60 mm
• Thread length: 22 mm
• Shank diameter: 7.0 mm
• Square drive size: 5.5 mm
• Surface treatment: Bright
• Application: Non-pressure-tight pipe threads
• Recommended materials: Steel, cast iron, non-ferrous metals

Final note

Manufactured to DIN 5157, this tap delivers consistent thread geometry for parallel pipe connections. Its HSS body and precise 55° profile make it a dependable tool for workshops and maintenance tasks.