Viking Ultra Bor Premium 135 H.S.S. Screw Machine Length Drill, Size 5/16″, .3125″ Decimal Size, 1-5/8″ Flute Length, 2-13/16″ Overall Length

• H.S.S. – High Speed Steel
• Hardness: 58 to 60 RC
• Series: 260-UB
• Finish Coating: Bronze
• No. of Flutes: 2
• Drill Point: 135
• Point Sharpening Type: Split Point
• Much tougher than cobalt steel.
• Thin web design will penetrate the work hardening (series 300, except for 303 which is free machining) stainless steel fast enough to continually cut beneath the chip which is hardening from deformation.
• 135 split point design stops drill walking, holds tighter hole size and takes a smaller chip resulting in less heat.
• Low temperature stress relief improves lubricity and toughness.
• Manufactured to NAS 907C specification.
• Nitro-carburized flute has an increased Rockwell hardness.
• Shank Style: Straight Shank
• Cutting Direction: Right Hand
• Workpiece Material Range: Steel, Stainless Steel, Non-Ferrous, Cast Iron, Plastics
• Country of Origin: U.S.A.

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