RUKO HGB-DIN352-HSS-55° 1/4 inch BSW 20 TPI HSS Straight Flute Hand Tap

The RUKO HGB-DIN352-HSS-55° is a precision hand tap engineered for cutting British Standard Whitworth (BSW) threads with a 55° thread angle. Unlike metric taps, this tap follows the DIN 352 standard specifically for Whitworth threads, making it the correct choice for legacy machinery, classic automotive work, and maintenance of older British equipment. Its high-speed steel construction and straight flute design ensure reliable chip evacuation and long tool life in general-purpose threading.

Highlights

• Thread Type: BSW (British Standard Whitworth)
• Thread Size: 1/4 inch
• Threads Per Inch: 20 G
• Standard: DIN 352
• Material: HSS (High-Speed Steel)
• Thread Angle: 55°
• Flute Type: Straight Flute
• Cutting Direction: Right-Hand Cut

In daily use

This hand tap is intended for manual threading operations in through or blind holes. The three-flute design balances cutting efficiency with strength, while the bright (uncoated) surface reduces friction in common steels, cast iron, and non-ferrous metals. The square drive size of 4.9 mm fits standard tap wrenches, providing a secure grip during use.

Full specifications

• Overall Length (L1): 60 mm
• Thread Length (L2): 18 mm
• Shank Diameter (d2): 6.0 mm
• Square Drive Size (a): 4.9 mm
• Number of Flutes: 3
• Tap Type: Single Hand Tap
• Application: General Purpose (Through & Blind Holes)
• Surface Treatment: Bright (Uncoated)
• Recommended Material: Steel, Cast Iron, Non-Ferrous Metals

Final note

For professionals and serious hobbyists who need a dependable BSW tap, the RUKO HGB-DIN352-HSS-55° delivers the precision and durability expected from a DIN 352 compliant tool.