Mandrel Arbor Diameter Compatible Drill Chuck Size(s)ДЎ/4' (arbor diameter) в†’ 1/4', 3/8', and 1/2' (chucks)ДЎ1/32' (arbor diameter) в†’ 3/8', and 1/2' (chucks)Д§/16' (arbor diameter) в†’ 1/2' (chucks only)Дrill Chuck Size Compatible Mandrel Arbor Diameter(s) 1/4' (chuck) в†’ 1/4' (arbor diameters only)ДЈ/8' (chuck) в†’ 1/4', and 11/32' (arbor diameters)ДЎ/2' (chuck) в†’ 1/4', 11/32', and 7/16' (arbor diameters)ДЄs chuck size decreases, a chuck's compatibility options for hole saw mandrel arbor shaft sizes decreases as well. The charts below show which drill chuck sizes can accept the three mandrel arbor shaft diameter sizes, and the reverse, which arbor diameter sizes can be accepted by the three drill chuck sizes. The three mandrel arbor diameter sizes correspond directly to the three drill chuck sizes. This means that some manufacturers will use 11/32' and 3/8' interchangeably when identifying mandrel specifications, even though the actual diameter is 11/32'. Hole saw arbor shafts come in three diameter sizes:Д«ecause the 11/32' and 7/16' hole saw mandrel arbor shaft sizes are so close to their corresponding drill chuck sizes, 3/8' and 1/2' (as shown below), some manufacturers use the rounded figures to describe hole saw mandrels. Drill chucks cannot accept bits and adapters with shanks larger than their chuck size. For hole saws, drills with larger chucks can accept larger hole saws, and, generally, will be increasingly powerful to handle the workload of the larger saws.Д«ecause of the way that jaw type chucks work (by closing around installed bits), larger chucks can also accept bits and adapters of smaller diameters. The chuck size partially reflects the power of the drill as well. Increasing the size of a drill's chuck allows it to accept larger bits and adapters at its working end. Jaw type drill chucks come in three sizes: Some hole saw mandrels are made for SDS chuck systems, in which case, the measurements here do not apply. Most hole saw mandrel arbors are designed to fit 'jaw type' drill chucks, and the measurements in this section refer only to jaw type drill chucks. The first compatibility feature to match is the hole saw mandrel shank size (diameter) to the drill chuck size. Match the Hole Saw Mandrel Shank to the Chuck In any case, it's best to understand the measurement specifics discussed below when shopping for hole saw mandrels.

In addition, many manufacturers use the actual measurements instead of a unique compatibility naming system. This is where knowing specific measurements and how they relate to compatibility comes in handy. Although these systems can be convenient and work very well when buying mandrels and hole saws from the same manufacturer, getting a replacement mandrel for your hole saw from the same manufacturer isn't always an option. There's nothing wrong with using manufacturer compatibility systems if there's a certain brand name of mandrel and hole saw that you like, but it never hurts to know the specifics too. Many manufacturers of hole saws and their mandrels develop their own compatibility naming systems to simplify shopping.

The collar screw thread size and the hole saw thread size must match. The arbor shaft size (diameter) and the drill chuck size must match.Дў.

drive pins- attach to corresponding holes in hole saws.Д«ecause a hole saw mandrel connects to both a drill's chuck at its arbor shaft end and the hole saw at the base of its collar, hole saw mandrels have two points of compatibility that shoppers must consider:ДЎ.

drill bit- protrudes from the collar screw.

collar screw- positioned at the center of the collar base.

collar base- the part of the collar on which the hole saw attaches.

collar- the middle section of the mandrel.

arbor shaft (shank)- affixes to drill chuck.

Most hole saw mandrels (but not all) also have strategically positioned drive pins that match corresponding holes in the bases of hole saws, on the outside of their center holes. The hole saw is then screwed onto the mandrel collar base screw. Hole saws are affixed to the base of the mandrel by passing the mandrel drill bit through a center hole in the hole saw. The base of the mandrel collar has a threaded collar screw protruding from its center that ends in a drill bit (most often a pilot bit, for starting the hole).

Directly from the drill chuck, a hole saw mandrel's arbor shaft (shank) extends to its collar.