standard

1 1/4 Inch Drill Bit Standard

This page provides standardized, specification-oriented reference information.

Specifications

Specification	Value
Diameter	1 1/4 inch (1.2500 in)
Common Uses	Large holes in wood; commonly via spade/auger/Forstner/hole saw; verify tool and arbor compatibility
Shank	Often reduced shank or 7/16" hex; verify chuck capacity

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Last updated: February 23, 2026