Klein Tools 31866 Heavy Duty Hole Cutter, 1-3/4 in - Durable Carbide

In this review the Klein Tools 31866 hole cutter is evaluated for tradespeople and metalworkers who need a reliable, heavy duty tool for cutting clean holes in sheet metal. The bottom line: it is built for durability and repeatable precision, with a carbide cutting edge and a split point pilot drill that prevents bit walking, making it an excellent choice when working with stainless steel, mild steel, iron, copper or brass up to 3/16 in thick. The integrated flange also helps prevent over-drilling, which saves time and reduces scrap on thin panels.

Key Features

• Carbide cutting edge: Provides long life and stays sharp through repeated cuts in hard metals for consistent performance.
• Material versatility: Cuts quick, precise holes in stainless steel, mild steel, iron, copper and brass sheet up to 3/16 in thick for broad jobsite use.
• Split point pilot drill bit: Prevents bit walking so the pilot starts on target and keeps the cut centered without drifting.
• Integrated flange: Stops the cutter from drilling beyond the sheet metal, protecting backing surfaces and ensuring uniform hole depth.
• Conduit and pipe size fit: Sized to match 1-1/4 in conduit and pipe openings, simplifying installation tasks that require that common diameter.
• Replaceable pilot: Uses replacement pilot bit 31874 so service is simple when the pilot wears.

Who It's For

The Klein 31866 is aimed at electricians, HVAC technicians, and metal fabricators who regularly cut holes in sheet metal and need a heavy duty, long-lasting cutter that handles tougher alloys like stainless steel. It is particularly useful on jobs that demand precise alignment and repeatability, such as conduit entries and mounting holes in metal panels.

Those who should look elsewhere are casual DIYers who only cut occasional holes in softer materials, since the tool is optimized for professional, repeated use and heavy duty service rather than infrequent hobby projects.

Pros & Cons

Pros

• Carbide construction gives extended life and reliable cutting through hard metals.
• Split point pilot drill reduces walking for accurate starts and cleaner holes.
• Integrated flange prevents over-penetration and protects the workpiece.

Cons

• Designed for sheet up to 3/16 in thick, so it is not suitable for thicker plate work.

Specifications

Brand	Klein Tools
Model / Part	31866
Cut diameter	1-3/4 in
Material compatibility	Stainless steel, mild steel, iron, copper, brass
Maximum sheet thickness	Up to 3/16 in (0.5 cm)
Pilot type	Split point pilot drill bit (replaceable 31874)
Feature	Integrated flange to prevent over-drilling

Our Verdict

The Klein Tools 31866 is a solid investment for professionals who cut holes in metal regularly and need durability, accuracy and a flange to protect workpieces. Its carbide construction and split point pilot give consistent results in hard metals, making it good value for those who require repeatable, clean holes up to 3/16 in thick.

Frequently Asked Questions

What materials will this cutter handle?
It cuts stainless steel, mild steel, iron, copper and brass sheet up to 3/16 in thick.

Does it prevent the pilot from wandering?
Yes, the split point pilot drill bit is designed to prevent bit walking for more accurate starts.

Can the pilot bit be replaced?
Yes, the cutter uses a replacement pilot bit designated 31874 for simple servicing.