Disston Company 120188 Hss Black Oxide Drill Bit 1/16 in

Product Description

The DISSTON COMPANY 120188 is a high speed steel (HSS) jobber-length drill bit with a black oxide finish, designed for general-purpose drilling across a wide range of common materials. Measuring 1/16 inch in diameter and 1-7/8 inches in length with a straight shank, this bit features a 135-degree split-point tip with four cutting edges. The split-point geometry eliminates walking on contact, so no center punch is needed for most applications. The black oxide tempering treatment reduces frictional heat buildup and promotes smoother chip evacuation during drilling. Licensed electricians, plumbers, HVAC techs, and general tradespeople keep bits like this on hand for everyday layout and rough-in work.

The 120188 is suited for drilling into wood, plastic, wallboard, plywood, soft metals, aluminum, brass, and bronze. It can also be used occasionally in stainless steel and other hard metals, though it is not optimized for sustained hard-metal drilling. This bit fits standard keyed and keyless chucks and is appropriate for residential and light commercial jobsite work where a compact, small-diameter bit is needed for pilot holes, wire routing, or penetrations through framing and light sheet material.

Key Features

• 135-degree split-point tip with four cutting edges eliminates bit walking on contact
• High speed steel construction provides durability across repeated use in soft to medium-hardness materials
• Black oxide tempering treatment reduces frictional resistance and improves chip flow
• Jobber-length straight shank fits standard drill chucks without adapters
• Compact 1/16-inch diameter suited for pilot holes, small-diameter penetrations, and layout work
• Rated for occasional use in stainless steel and other hard metals

Compatibility

Designed for use in standard keyed and keyless drill chucks accepting a straight shank. Recommended for wood, plastic, wallboard, plywood, soft metals, aluminum, brass, and bronze, with occasional use in stainless steel and other hard metals.

Installation Notes

Secure the bit firmly in the chuck before drilling and confirm the chuck is fully tightened to prevent slippage. Apply steady, moderate pressure and allow the split-point geometry to do the cutting work without forcing the bit. Reduce drilling speed when working in harder metals to extend bit life and prevent overheating. Inspect the cutting edges before each use and replace the bit if the tip shows signs of dulling or heat discoloration.