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Goliath British Standard Whitworth Intermediate HSS Tap Automotive Timing Belts Hi-Vis mens polo shirt byHSS Bright Finish BSW Hand and Machine Intermediate Tap This thread form was developed by Sir Joseph Whitworth in 1841 British Standard Whitworth angle of thread is 55 degrees as opposed to 60 degrees in Metric and Unified threads HSS Bright Finish BSW Hand and Machine Intermediate Tap. British Standard Whitworth angle of thread is 55 degrees as opposed to 60 degrees in Metric and Unified threads. HSS taps provide a high hardness to toughness ratio,