Bi-Metal Hole Saw Sizes for Electrical and Plumbing Work
By Quality Industrial Abrasives and Tools | Benchmark Abrasives | Published: 2026-10-29
Category: Kaufberatung
Choose the right bi-metal hole saw size for electrical and plumbing tasks. This guide covers common sizes, including 15/16" and 1", and offers practical decision rules.
Quick Answer
For most electrical and plumbing work, a 1" bi-metal hole saw is the go-to size for standard cable runs and 1/2" conduit, while a 15/16" size is ideal for tighter fits like switch boxes or where you need a little less clearance.
Why Size Matters in Electrical and Plumbing Work
In electrical and plumbing installations, the hole saw size determines how easily cables, conduits, or pipes pass through wood or metal studs. A hole that's too small forces you to re-cut or damages the material; one that's too large weakens the structure or leaves an unsightly gap. Bi-metal construction gives you the durability to cut through both wood and thin metal studs without switching tools.
Trade-Off: 15/16" vs 1"
The 15/16" (24mm) hole saw is slightly smaller than 1" (25mm). This 1mm difference matters: the 15/16" gives a snug fit for non-metallic sheathed cable (Romex) or low-voltage wiring where you want minimal play. The 1" is the standard for 1/2" electrical metallic tubing (EMT) or 1/2" rigid conduit, because it provides enough clearance for the connector and locknut. For plumbing, 1" is the minimum for 3/4" copper or PEX pipe, but you may need a larger size if you are passing a fitting through the hole.
Decision Rules for Choosing a Hole Saw Size
- For standard 1/2" conduit or EMT: Choose a 1" hole saw. This gives you the clearance needed for the connector and locknut to fit through the knockout.
- For non-metallic cable (Romex) or low-voltage wiring: A 15/16" hole saw provides a snug fit that prevents the cable from chafing against the edge of the hole.
- For 3/4" copper or PEX pipe: Use a 1" hole saw as a minimum. If you are passing a fitting (e.g., a 90-degree elbow) through the stud, you will need a larger saw — typically 1-1/8" or 1-3/8". Measure the outside diameter of the pipe and its largest fitting before choosing your hole saw size.
Product Facts
- 15/16" Bi-Metal Holesaw: 15/16" (24MM) Bi-Metal Hole saw, Made in USA, 4/6 TPI, positive rake angle, side cut outs for debris removal. The side cut outs make plug removal quick, which is handy when you're cutting multiple holes for cable runs in a stud bay.
15/16" Bi-Metal Holesaw - 1" Bi-Metal Holesaw: 1" (25MM) Bi-Metal Hole saw, Made in USA, 4/6 TPI, positive rake angle, side cut outs for debris removal. The 1" is the most common size for passing 1/2" conduit or 3/4" pipe, and the bi-metal build lets you cut through wood and thin metal studs without swapping blades.
1" Bi-Metal Holesaw
Who Should Use These Sizes
Best for
- Electricians running 1/2" conduit or Romex through wood or metal studs
- Plumbers installing 3/4" copper or PEX pipe in residential framing
Not for
- Large-diameter pipe (over 1") — you will need a hole saw 1/4" larger than the pipe OD
- Cutting through thick steel or cast iron — use a carbide-tipped or diamond hole saw instead
