No 4 x 0.66 BA 13/16" HSS Button Die - Goliath

About this item:

• No 4 x 0.66 BA 13/16" HSS Button Die - Goliath
• HSS Circular Split Button Die
• HSS Button Dies (also known as Adjustable Dies) are designed for cutting external threads.
• They are used for threading rods, bolts, and studs, either by hand using a die stock, or by machine using a floating die holder.
• They also can be used to cut smaller or larger, than factory setting, by utilising the adjusting screws in the die holder.
• Dies are manufactured with a thread chamfer to aid starting.
• M2-HSS material provides increased wear resistance and superior thread accuracy.
• British Association thread form - in 1884 the British Association for the Advancement of Science adopted a thread form and series, primarily for use in precision equipment.
• It was inspired by one used in the Swiss watch and clock industry, and was formerly sometimes called the Swiss Small Screw Thread System; but is now just referred to as the BA series.
• Like the Whitworth thread, it has a rounded root and crest, but the included angle is 47.5º.
• Despite the date of origin and the British sponsorship, the BA is a metric series.
• Not only is it based on the metre, but the thread frequency is specified in terms of round numbers in the pitch sequence, with threads per metre allowed to fall where it may.