1/32" thru 31/32" Drill Bits

Fractional Drill Bits for Automotive Service Professionals

Fractional drill bits ranging from 1/32" through 31/32" are essential tools in any automotive service shop. These high-speed steel bits handle a wide variety of drilling applications across metal, wood, and plastic materials commonly encountered in vehicle maintenance and repair work.

Understanding Drill Bit Types in This Category

Jobber Length Drill Bits

Jobber length bits are the most common style, offering a balanced length-to-diameter ratio suitable for general-purpose drilling. These bits typically range from 1-3/4" to 2-11/16" in overall length depending on diameter, providing good control and versatility for everyday shop tasks.

Reduced Shank (Silver & Deming) Drill Bits

For larger diameter drilling applications, reduced shank bits feature a 1/2" shank regardless of bit diameter. This design allows you to drill larger holes using standard 1/2" chuck drills. These bits are generally 6" in length and often feature a three-flatted shank design that provides superior grip in keyless chucks and reduces slippage during heavy-duty operations.

High-Speed Steel Construction

Most drill bits in this category are constructed from either M-2 or M-7 high-speed steel (HSS). M-2 HSS offers an excellent combination of strength, heat resistance, and wear resistance for general applications. M-7 HSS provides enhanced abrasion resistance for more demanding drilling operations. Both materials maintain their hardness and cutting edge even when heated during use, making them suitable for continuous shop operations.

Selecting the Right Bit Size

Fractional drill bits increase in 1/32" increments, giving you precise sizing options for your specific application. When selecting a bit size, consider:

• Bolt and fastener clearance holes typically require bits sized slightly larger than the fastener diameter
• Pilot holes for tapping threads should match the tap drill size specified for your thread size
• Material removal applications may benefit from stepped drilling, starting with a smaller pilot hole
• Chuck capacity limits on your drill or drill press

118-Degree Point Geometry

The standard 118-degree point angle found on these bits is designed for versatility across wood, metal, and plastic. This general-purpose geometry provides a good balance between cutting performance and point strength, making it suitable for the varied materials encountered in automotive service work.

Common Automotive Applications

• Drilling out broken fasteners and damaged bolt holes
• Creating mounting holes in brackets, panels, and frames
• Preparing holes for self-tapping screws and rivets
• Enlarging existing holes for larger fasteners
• Drilling through sheet metal, aluminum, and steel components
• Creating pilot holes for step bits and hole saws
• General fabrication and custom equipment mounting

Safety Considerations

• Always wear safety glasses when drilling to protect against metal chips and debris
• Secure workpieces properly before drilling to prevent rotation or movement
• Use appropriate drilling speeds for the material and bit size being used
• Allow bits to cool between heavy-use cycles to preserve edge sharpness
• Inspect bits regularly for wear, damage, or dullness
• Ensure bits are properly secured in the chuck before operation

Note: Specifications vary by model. Always check individual product listings and manufacturer documentation for exact details including overall length, shank design, and material composition.