{"product_id":"precision-twist-r56co-cobalt-steel-reduced-shank-drill-bit-black-and-bronze-oxide-finish-1-2-reduced-shank-118-degree-split-point-3-4-3-4","title":"Precision Twist R56CO Cobalt Steel Reduced Shank Drill Bit, Black and Bronze Oxide Finish, 1\/2\" Reduced Shank, 118 Degree Split Point, 3\/4\" 3\/4\"","description":"\u003ch3\u003ePrecision Twist R56CO Cobalt Steel Reduced Shank Drill Bit, Black and Bronze Oxide Finish, 1\/2\" Reduced Shank, 118 Degree Split Point, 3\/4\"\u003c\/h3\u003e\n\u003cp id=\"b\"\u003eThe Precision Twist R56CO Jobber-length, combination black (also called steam\ntempered) and bronze oxide, general-purpose, round shank drill bit drills\nholes into a wide variety of metals and synthetic materials with best\nperformance with steel, stainless steel, cast iron, titanium, nickel, and\ncopper. It can drill to a depth up to four times the diameter of the drill\nsize. Flute length is three inches, overall length is six inches, with a half-\ninch, reduced shank. The R56CO series has a type N flute form (a regular helix\nangle of 21 to 34 degrees). The combination black oxide and bronze finish\nimproves lubricity, resists corrosion, and will not chip or flake off. Black\nand bronze oxide is an appealing surface treatment which combines the benefits\nof both black oxide and bronze oxide. Black oxide finish gives a strongly\nadhering blue oxide surface that acts to retain cutting fluid and prevent chip\nto tool welding, reducing the formation of a built-up edge. Bronze oxide is a\nlow temperature heat treatment which reduces grinding stress within the tool,\nand has an appealing, easy-to-identify bronze color. Bronze oxide is commonly\nused to identify cobalt steel tools. Reduced shanks are smaller than the drill\ndiameter, so they can drill holes larger than the typical chuck capacity.\nThese are sometimes called Silver \u0026amp; Deming drills; they used to be made by\nSilver \u0026amp; Deming in the late 1800s, but now it refers to any reduced shank\ntwist drill bit. Made of HSS with cobalt which is many times harder\/stiffer\nthan HSS, will hold an edge longer, and will deflect less than HSS. These are\nalso more resistant to heat than HSS. These qualities allow it to run at\nhigher speeds and feeds. They are made to ANSI (fractional sizing) industry\nstandards, which ensure that drill bits around the world, conform to the same\nspecifications. Drilling, or hole making, is the most common metalworking\noperation in the world. Twist drill bits are the most common type of drill bit\nused. Twist drill bits are commonly used to drill holes with hand-operated\ndrills, standalone drill presses, or lathes. The flutes of the drill bit act a\npassageway for chip extraction from the hole and for coolant to enter the\nhole. These drill bits have a right-hand twist that brings chips up and away\nfrom the cutting edge.Dormer Pramet manufactures cutting tools under the\nfollowing brands: Precision Twist Drill, Dormer, Union Butterfield and Pramet.\nThe company has locations around the world, and provides tools adhering to\nANSI, NAS, and DIN standards.\u003c\/p\u003e \n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n  \u003cul class=\"a\"\u003e\n         \u003cli\u003eHigh-speed steel (HSS) containing cobalt is a good combination of toughness and hardness, for use on drilling through hard substances\u003c\/li\u003e\n         \u003cli\u003eCombination black oxide and gold finish, improves lubricity, resists corrosion, and will not chip or flake off\u003c\/li\u003e\n         \u003cli\u003eHalf-inch round shank allows larger sized drills to fit into small size chucks\u003c\/li\u003e\n         \u003cli\u003eJobber-length drill bits, most common length drill bit, suitable for a wide range of applications\u003c\/li\u003e\n         \u003cli\u003e118-degree split-point angles, for general drilling applications\u003c\/li\u003e\n  \u003c\/ul\u003e","brand":"Precision Twist Drill","offers":[{"title":"3\/4\"","offer_id":48068190896279,"sku":"B00075R7G8","price":236.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0461\/8380\/9175\/files\/B00075R7G8.jpg?v=1785061979","url":"https:\/\/newnestshop.com\/products\/precision-twist-r56co-cobalt-steel-reduced-shank-drill-bit-black-and-bronze-oxide-finish-1-2-reduced-shank-118-degree-split-point-3-4-3-4","provider":"NewNest Australia","version":"1.0","type":"link"}