![]() ![]() 1043 2.650 6 Engineers Black Book - 2nd Edition DRILL SIZE & DECIMAL EQUIVALENT CHART Fract. Tool Length Symbol Length (mm) Insert Size External Threading Toolholder Internal Threading Bar R Right Hand L Left Hand Internal Toolholder External Toolholder. Shank Size Shank - h x b Example 2020 = 20 x 20 mm Shank - Diameter d Example 0020 = 20 mm diameter. ![]() of Teeth / Chip Breaker Optional : To Manufacturer’s Discretion Clamping Insert Clamping System C - Clamp System S - Screw System Version Application External / Internal E - External Threading N - Internal Threading NOTE : Some manufacturers use “ I “ to denote Internal. rpm feed rpm feed rpm feed rpm feed rpm feed rpm feed rpm feed rpm feed rpm feed rpm feed rpm feed rpm feed 7 C 1 E 2 R 3 2020 4 K 5 16 6 7 1 3 2 4 5 D - 60 F - 80 H - 100 K - 125 L - 140 M - 150 P - 170 R - 200 S - 250 T - 300 U - 350 V - 400 6 L (mm) d (mm) - ic 06 3.97 08 4.76 11 6.35 16 9.525 22 12.70 27 15.875 C 1 N 2 R 3 0020 4 P 5 16 6 7 136 Engineers Black Book - 2nd Edition TUNGSTEN CARBIDE TOOLHOLDER IDENTIFICATION (THREADING) No. NOTE : To enhance Hole Quality and Tool Life, the use of copious quantity of coolant is recommended, particularly directed at the drill point to prevent chipping or flaking of the Carbide cutting edge. Twist Drill - 25°-30° 2 & 3 Flute general purpose drill ideal for low-tensile & non- ferrous materials such as high Si Aluminium, Bronze, Masonite & Resin/ Fibreglass Laminates. Also recommended for Stainless Steel, Tool Steel & Titanium-Nickel Alloys. Slow Spiral Drill - 15°-20° Designed to drill hardened and gummy materials and High-temperature Alloys.
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