1/2″ Trade Size conduit, drill using a 7/8″ hole saw or 1/2″ conduit knockout punch (.885″ or 22.5mm).

Electrical conduit hole saw sizes and knockout punch dimensions for most North American conduits - Updated May 12, 2025

This Conduit Hole Saw Size Chart provides a useful reference for selecting the appropriate hole saw size for various conduit materials. For each material, the chart outlines the smallest hole saw size, the largest hole saw size, the minimum hole size, and the maximum hole size.

The stated values are calculated: the minimum overlap (Dim X) equals the minimum diameter (at flange or outer diameter of locknut) (Dim. B), minus the minimum major diameter (Dim P), divided by 2, minus the conduit clearance (Dim C); where Dim C …

But you cannot create a secure connection unless the knockout hole fits the conduit size. Fortunately, you don’t have to overthink this decision. You can check the below table that shows the different conduit sizes and their corresponding …

HOLE SAW SIZING CHART ... * Brands: Dewalt, Greenlee, Milwaukee and Lenox. *Recommended Hole Saw sizes, when not using an NDR style Mounting Plate. www.ndrelectric.com 1 ... Feb. 2020

IDEAL BI-METAL HOLE SAW SELECTION GUIDE Bi-Metal Hole Saw Diameter Inches MM Pipe Tap Size Pipe Entrance Size Inches MM Part No. Bi-Metal Hole Saw Diameter Inches MM Pipe Tap Size Inches MM Pipe Entrance Size Inches MM Inches MM Compatible with 1/4 in. Round Arbor 36-570, 3/8 in. Hex Arbor 36-571, Part No.

Use a handy hole saw size chart and our guide to choose proper hole saw sizes for your electrical, plumbing, woodworking projects and more.

We sell special corrigated plastic low-voltage conduit, also called raceway, by the foot and by the box for your wiring project. Match your knock-out hole size in the table below to determine the condiuit size you should use.

This document provides hole saw and punch sizes for various sizes of electrical conduit. It lists the hole saw diameter needed to drill holes for 1/2" to 6" conduit, as well as the equivalent punch sizes.