Carbide Hole Saw Sizes for Sheet Metal
By Drill Hog® | Published: 2026-10-19
Category: Buying Guides
Learn how to choose carbide hole saw sizes for sheet metal. Compare 2-5/8" and 1-1/4" TCT cutters and get practical decision rules.
Quick answer
For most sheet metal work, a 1-1/4" carbide hole saw handles common electrical and plumbing openings, while the 2-5/8" size suits larger conduit and cable runs.
Why size matters in sheet metal
Sheet metal projects often require precise holes for conduit, cables, or ventilation. Using the wrong hole saw size can lead to oversized openings that compromise structural integrity or undersized holes that don't fit the intended component.
Carbide-tipped (TCT) hole saws are designed specifically for clean cuts in sheet metal without burrs, making them ideal for electrical panels, HVAC ductwork, and metal enclosures.
Trade-offs between sizes
Larger diameter hole saws like the 2-5/8" require more torque and a drill with sufficient power. They also generate more heat, so proper lubrication and intermittent cutting are recommended to extend tool life.
Smaller sizes such as the 1-1/4" are easier to handle and put less strain on the drill, but they may not accommodate larger connectors or fittings.
How to choose the right carbide hole saw size
- Match diameter to component size: Measure the outside diameter of the component (conduit, cable, fitting) that will pass through the hole. Add 1/8" to 1/4" for clearance. Choose a hole saw that matches or slightly exceeds that total.
- Consider drill compatibility: Both the 1-1/4" and 2-5/8" carbide hole saws use a 3/8" shank that fits any drill with a 3/8" or larger chuck. For the larger size, ensure your drill has enough torque (at least 6-8 amps or cordless equivalent) to maintain cutting speed without stalling. Check your drill's specifications before selecting a larger hole saw.
- Use the pilot bit for accuracy: Both sizes include a pilot bit that centers the cut and prevents walking. Always start the pilot bit first, then engage the hole saw. This ensures a precise, round hole even on curved or thin sheet metal.
- Plan for plug ejection: The built-in spring automatically ejects the metal plug after cutting. This saves time and reduces the risk of jamming. For deep cuts, retract the saw periodically to clear chips and prevent overheating. Clean the spring mechanism after each use to maintain reliable ejection.
Product facts
- 2-5/8" Carbide Hole Saw Cutters 2-5/8 TcT Tungsten Sheet Metal Holesaw Drill Hog: 2-5/8" diameter with 3/8" shank, tungsten carbide tipped (TcT), built-in flange prevents over-drilling, spring ejects plug. This larger size is ideal for cutting clean holes for large conduit or cable bundles without needing to deburr the edge.
2-5/8" Carbide Hole Saw Cutters 2-5/8 TcT Tungsten Sheet Metal Holesaw Drill Hog - 1-1/4" Carbide Hole Saw Electrician Cutters TcT Tungsten Sheet Metal Holesaw Kit: 1-1/4" diameter with 3/8" shank, tungsten carbide tipped (TcT), built-in flange prevents over-drilling, spring ejects plug. This compact size is perfect for standard electrical box openings and smaller pipe penetrations, reducing drill strain.
1-1/4" Carbide Hole Saw Electrician Cutters TcT Tungsten Sheet Metal Holesaw Kit
Which size fits your project?
Best for
- 2-5/8" carbide hole saw: Large conduit runs, cable trays, ventilation openings in heavy-gauge sheet metal.
- 1-1/4" carbide hole saw: Standard electrical boxes, small pipe penetrations, light-gauge sheet metal.
Not for
- Very thick metal (over 1/4"): Consider a step drill or annular cutter instead.
- Non-metal materials: Carbide-tipped saws are optimized for metal; use bi-metal or diamond hole saws for wood or masonry.
