Cleveland 2550 High Speed Steel Long Length Drill Bit, High Helix, Uncoated (Bright), Round Shank, 118 Degree Conventional Point, Wire Size #49 (Pack of 10)

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  • The Cleveland 2550 long-length, high-speed steel (HSS) drill bit has a 38-degree helix angle, with a 118-degree drill point and uncoated surface treatment, which is designed for general purpose drilling applications. The shank diameter is the same as the drill size. The helix angle improves chip removal in softer materials from the hole better than a smaller helix angle.

    The 2550 series performs best when drilling into alloy steel, aluminum, copper alloys, and plastic. The uncoated finish helps increase chip flow in soft materials. Spiral flutes act as a passageway for chip extraction from the hole and for coolant to enter the hole. The twist of the flutes brings chips up and away from the cutting edge. The higher, also called faster helix angle provides greater lifting power for chips than a slower helix and works well in deeper holes. The 118-degree drill point is the most common angle with a good comprise of performance across a wide range of materials. The long also known as taper length has more reach than Jobber-length bits and allows for deeper holes. Round shanks allow use with a wide variety of tool holding systems. Made of HSS, which is a common, general-purpose steel for cutting tools, offers toughness and shock resistance, and is compatible with a variety of materials.

    The tolerances for various aspects of the Cleveland drill bits are: drill diameter range through 1/8 +0.0000 /-0.0005 , over 1/8 to 1/4 +0.0000 /-0.0007 , over 1/4 through 1/2 +0.0000 /-0.0010 , over 1/2 to 1 +0.0000 /-0.0012 , over 1 to 2 +0.0000 /-0.0015 , over 2 to 3-1/2 +0.0000 /-0.0020 ; drill overall length and flute length #80 through 1/8 +0.1250 /-0.0626 , over 1/8 to 1/2 +0.1250 /-0.1250 , over 1/2 to 1 +0.2500 /-0.1250 , over 1 to 2 +0.2500 /-0.2500 , over 2 to 3-1/2 +0.3750 /-0.3750 ; drill point angle diameter range 1/16 to 1/2 included angle 118 or 135 degrees +/-5 degrees, over 1/2 to 1 1/2 included angle 118 degrees +/-3 degrees, over 1-1/2 to 3-1/2 includes angle 118 degrees +/- 2 degrees; drill lip height diameter range 1/16 to 1/8 total indicator variation 0.0020 , over 1/8 to 1/4 total indicator variation 0.0030 , over 1/4 to 1/2 total indicator variation 0.0040 , over 1/2 to 1 total indicator variation 0.0050 , over 1 to 3 1/2 total indicator variation 0.0060 .

    Drill bits are cutting tools used to make holes in a range of materials. They are used in machines such as handheld portable drills, drill presses, machining centers, and lathes. Drill bits come in a variety of types and lengths. Twist drill bits are the most common type of drill bit. They are a round, twisted shaft, end-cutting tool with two or more cutting edges and two or more flutes. Extra long drill bits (also called extension) are twist bits with extended lengths for drilling deeper holes or greater reach. They are longer than long length bits.

    Greenfield Industries manufactures tools under the brand names Cleveland, Chicago-Latrobe, Cle-Line, Vermont Tap & Die, Bassett, Putnam Tools, Geometric, Vers-O-Tool, H & G, and Acme-Fette. The company owned by Top-Eastern Group and headquartered in Seneca, SC, makes tools that meet American National Standards Institute (ANSI), National Aerospace Standard (NAS), and Deutsches Institut f r Normung (DIN) standards.


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