TAP: BSW 5/16″ X 18 INTER HAND TAP

* British Standard Whitworth (BSW) is an imperial-unit-based screw thread standard, devised and specified by Joseph Whitworth in 1841 and later adopted as a British Standard. It was the world's first national screw thread standard, and is the basis for many other standards, such as BSF, BSP, * All taps are manufactured from quality HSS-M2 for durability and extended tool life * These 3pc sets consist of: Taper, Intermediate and botton taps * Taper or first tap has a long chamfer and trapeziform cutting edges and preformd about 60% of the cutting work * The intermediate or second tap has a shorter chamfer and trapeziform cutting edgeswhich are deeper, and completes around 30% of the cutting work * The 3rd or bottoming tap (finishing) has a short chamfer and cutting edgeswhich create the final sharp form of the thread groove

* British Standard Whitworth (BSW) is an imperial-unit-based screw thread standard, devised and specified by Joseph Whitworth in 1841 and later adopted as a British Standard. It was the world's first national screw thread standard, and is the basis for many other standards, such as BSF, BSP, * All taps are manufactured from quality HSS-M2 for durability and extended tool life * These 3pc sets consist of: Taper, Intermediate and botton taps * Taper or first tap has a long chamfer and trapeziform cutting edges and preformd about 60% of the cutting work * The intermediate or second tap has a shorter chamfer and trapeziform cutting edgeswhich are deeper, and completes around 30% of the cutting work * The 3rd or bottoming tap (finishing) has a short chamfer and cutting edgeswhich create the final sharp form of the thread groove

* British Standard Whitworth (BSW) is an imperial-unit-based screw thread standard, devised and specified by Joseph Whitworth in 1841 and later adopted as a British Standard. It was the world's first national screw thread standard, and is the basis for many other standards, such as BSF, BSP, * All taps are manufactured from quality HSS-M2 for durability and extended tool life * These 3pc sets consist of: Taper, Intermediate and botton taps * Taper or first tap has a long chamfer and trapeziform cutting edges and preformd about 60% of the cutting work * The intermediate or second tap has a shorter chamfer and trapeziform cutting edgeswhich are deeper, and completes around 30% of the cutting work * The 3rd or bottoming tap (finishing) has a short chamfer and cutting edgeswhich create the final sharp form of the thread groove

* British Standard Whitworth (BSW) is an imperial-unit-based screw thread standard, devised and specified by Joseph Whitworth in 1841 and later adopted as a British Standard. It was the world's first national screw thread standard, and is the basis for many other standards, such as BSF, BSP, * All taps are manufactured from quality HSS-M2 for durability and extended tool life * Taper or first tap has a long chamfer and trapeziform cutting edges and preformd about 60% of the cutting work * This Taper tap has an 8 thread lead in