CHICAGO-LATROBE 69851 21PC 135 Degree Heavy-Duty Jobber Length Drill Set

The CHICAGO-LATROBE 69851 Jobber Length Drill Bit Set features 21 high speed steel drill bits made for cutting materials classified under ISO codes K and P (cast iron and steel), as specified for this set. Includes drill sizes 1/16 inch through 3/8 inch in fractional increments, included with a metal drill index for storage and organization. Bits are jobber length with a 4x depth-to-diameter ratio and a P3 split point with a 135-degree angle to improve drilling centering and reduced walking (per specified geometry). The right-hand spiral flutes feature right-hand spiral flutes for chip removal during standard drilling operations. Conforms to NAS 907 Type B specification.

Key Features:

• - Includes 21 straight-shank drill bits sized 1/16" to 3/8" by 64ths.
• - Made of high speed steel for cutting materials classified under ISO codes K and P (cast iron and steel), as specified.
• - Jobber-length bits with overall lengths from 1 7/8 inch to 4 inch (overall length varies by bit size).
• - 2-flute spiral design with right-hand cutting direction and helix angles between 21° and 34°.
• - Point type: P3 split point with 135° point angle to reduce walking and improve centering.
• - Finish: black oxide coating for reduced friction.
• - Supplied in a metal drill index for organization and storage.
• - Conforms to NAS 907 Type B specification for aircraft-grade drill bits.

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