Cle-line C97375 Jobber Drill Bit No. 21 Hss Tin

Product Description

The CLE-LINE C97375 is a jobber-length drill bit designed for general-purpose metal drilling in professional trade and industrial shop environments. Sized to wire gauge No. 21 with a decimal diameter of 0.1600 inches, it is ground from high-speed steel and finished with a TiN tip coating to extend cutting edge life in ferrous and non-ferrous materials. The 118-degree split-point tip reduces walking on entry and requires no center punch on flat stock. Overall length is 3.25 inches with a 2.13-inch spiral flute and a straight-cylindrical shank. Right-hand cut with a regular spiral makes it compatible with standard drill presses and hand-held electric drills used by HVAC techs, plumbers, electricians, and general fabricators.

This bit fits production and maintenance drilling applications where a No. 21 hole is required, including tapping prep for 10-32 machine screws, sheet metal work, and light structural steel. The 3xD flute-to-diameter ratio and tapered web configuration suit through-hole drilling in stock up to 0.40 inches deep per pass. It is sold individually and suits tool rooms, service vans, and shop benches that need a reliable single-bit replacement without buying a full index set.

Key Features

• No. 21 wire gauge size, 0.1600-inch decimal diameter ground to ASME B94.11M tolerances (+0.0000 to -0.0007 inches)
• TiN tip coating reduces friction and extends cutting life at the point without adding brittleness to the shank
• 118-degree split-point geometry minimizes walking and reduces thrust force on entry
• High-speed steel construction handles intermittent heat and moderate feed rates without edge rollover
• Straight-cylindrical shank fits standard 3-jaw drill chucks on presses and hand drills
• 2-flute regular spiral design clears chips efficiently in both metal and plastic

Compatibility

Designed as a direct-fit jobber-length replacement for any application requiring a No. 21 wire gauge drill bit with a straight-cylindrical shank conforming to ASME B94.11M and ANSI specification designation standards.

Installation Notes

Install in a properly sized 3-jaw chuck and confirm runout before drilling to avoid oversizing the hole. Secure the workpiece firmly before engaging the bit, and use appropriate cutting fluid on ferrous stock to preserve the TiN tip coating and extend tool life. Licensed electricians, plumbers, and HVAC technicians should follow applicable trade codes and shop safety practices when operating drill presses or hand-held rotary tools. Discard the bit if the cutting edge shows visible chipping or if the shank shows deformation that prevents true seating in the chuck.