Step Drill Bits

High-speed steel step bits in hex and round shank configurations — clean, burr-free holes from 1/8" through 1-3/8" in a single tool.

1/8" – 1-3/8" Diameter Range
Up to 13 Steps per Bit
2 Shank Styles
HSS + Ti Materials

1/4" Hex Shank

Step Bits

Quick-change hex shank fits standard hex chucks and impact drivers without adapters. Available with titanium coating for extended bit life in high-volume production runs.

Material HSS Shank 1/4" Hex Finish Bright / Titanium Flute 3/8" Dia.
1/4 inch hex shank step drill bits
Item Number Range Steps Notes
TH-ST-HX3/8.1/4~3/4 1/4" to 3/4" 9 —
TH-ST-HX3/8.3/16~7/8 3/16" to 7/8" 12 —
TH-ST-HX3/8.1/4~1-1/8 1/4" to 1-1/8" 3 —
TH-ST-HX3/8.1/4~1-3/8 1/4" to 1-3/8" 6 —
TH-ST-HX1/4.1/8~1/2 1/4" to 1/2" 13 Titanium

Titanium — TiN-coated variant for extended service life in production environments.

3/8" Round Shank

Step Bits

Standard 3/8" round shank seats directly in keyed or keyless chucks. Matches all four diameter ranges of the hex shank series for cross-tool consistency in mixed-chuck environments.

Material HSS Shank 3/8" Round Finish Bright Flute 3/8" Dia.
3/8 inch round shank step drill bits
Item Number Range Steps
TH-ST-RD3/8.1/4~3/4 1/4" to 3/4" 9
TH-ST-RD3/8.3/16~7/8 3/16" to 7/8" 12
TH-ST-RD3/8.1/4~1-1/8 1/4" to 1-1/8" 3
TH-ST-RD3/8.1/4~1-3/8 1/4" to 1-3/8" 6