Precise Fast Spiral H.S.S. Jobbers Length Twist Drill, Size O, .3160″ Decimal Diameter, 4-1/2″ Overall Length

• H.S.S. – High Speed Steel
• Hardness: 58 to 60 RC
• No. of Flutes: 2
• For drilling operations in low tensile strength, softer materials that may pose problems with chip ejection.
• Typically the materials drilled with these drills are softer ferrous metals and alloys, such as soft steels and soft cast iron.
• Soft non-ferrous metals and alloys, such as aluminum, magnesium, copper and zinc alloys may also be machined with these drills
• Combination of fast spiral and high helix angle as well as the wider flutes provide very efficient chip movement and ejection.
• For many different applications with hand held manual drills and either portable or stationary machine tools.
• Lubricating/cutting oils or the appropriate coolant fluids are recommended to achieve the optimal performance and the best tool life.
• Right hand (clockwise rotation) cutting direction.
• Standard two flute design with wider flutes.
• Fast spiral, high helix flutes.
• Helix angle: 34- 40
• Straight shanks that correspond to drill diameter.
• Precision ground flutes.
• Cylindrically ground.
• 118 point angle and standard web thickness.
• Bright finish.
• Series: A6
• Workpiece Material Range: Non-Ferrous, Cast Iron, Plastics

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