Description
BORDO FRACTIONAL LEFT HAND COBALT TOUGH HSS-Co5 JOBBER DRILLS ANSI B94-11135° Split Point (crankshaft point)
Split point is self centering and the short distance from the drill axis to the outer corners results in faster penetration, reducing the need for end thrust. The 135º point should be used to cut harder steel materials especially in deep hole applications. In these situations it will produce thicker chips minimising work hardening of the cavity. Faster penetration reduces abrasion and friction along the cutting edges. Cobalt HSS jobber drills are extremely hard and provide superior performance and increased tool life especially in stainless steel and high tensile steeUSAGE
Left Hand jobber drills are ideal for use with screw extractors to remove broken bolts and screws.
DRILL BIT SURFACE TREATMENT
Bronze Finish (gold oxide). The metallic brown coloured low temperature temper treatment is normally only used on cobalt tools for identification purposes.
- Spindle Speed Stainless Steel RPM:608
- Spindle Speed Tool Steel RPM:912
- Spindle Speed Cast Iron RPM:1217
- Spindle Speed Malleable Iron RPM:1369
- Spindle Speed Med. Carbon Steel RPM:1521
- Spindle Speed Free Cutting Steel RPM:2180
- Spindle Speed Aluminium/Brass RPM: 3092
- Spindle Speed Wood/Plastic RPM:4613
- Feed per revolution mm: 0.2
Additional Information
19/64" HSS Cobalt Left Hand Drill 2005-19/64 by Bordo
$10.20
Optional Accessories
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