HSS Hand Tap G 1/2 DIN 5157D for Pipe Threading

Precision hand tap for cutting G 1/2 parallel pipe threads according to DIN 5157D. Made from high-speed steel (HSS), this tap delivers clean, accurate internal threads in steel, cast iron, and non-ferrous metals. Its 4-flute design ensures efficient chip evacuation, while the bright finish reduces friction for smoother cutting.

Advantages

High-speed steel construction offers excellent wear resistance and long tool life. The parallel thread form (55° angle, 14 TPI) conforms to the G (BSP) standard, ensuring compatibility with standard pipe fittings. The square drive provides a secure grip for hand tapping operations.

Suitable for

• Internal threading of pipes and fittings
• Maintenance and repair work in plumbing and mechanical engineering
• Machining of steel, cast iron, and non-ferrous metals
• Manual tapping applications with a tap wrench

Key specifications

• Thread standard: G (BSP Parallel)
• Nominal thread size: 1/2 inch
• Thread pitch: 14 TPI
• Thread form angle: 55°
• Overall length: 90 mm
• Thread length: 28 mm
• Shank diameter: 11.0 mm
• Square drive size: 9.0 mm
• Number of flutes: 4
• Material: High-Speed Steel (HSS)
• Cutting direction: Right-hand
• Surface finish: Bright

Recommendations

Use with a suitable tap wrench and apply appropriate cutting fluid for best results. For through holes, consider a taper tap; for blind holes, a bottoming tap may be required after initial threading.