standard

1 3/8 Inch Drill Bit Standard

This page provides standardized, specification-oriented reference information.

Specifications

Specification	Value
Diameter	1 3/8 inch (1.3750 in)
Common Uses	Very large holes in wood (auger/spade/Forstner/hole saw); verify tool capability and feed rate
Shank	Often reduced shank or hex; verify chuck capacity

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Last updated: February 23, 2026