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These spring-loaded drill stops from Avery Tools don’t mark the surface like a collar stop, and they cushion the drill when it breaks through to minimize bit breakage.

Designed for sheet metal, we don’t see any reason these stops wouldn’t work for other materials too.  The bits are color-coded for easy identification. You just slip the stop over the bit, compress the spring, and tighten the stop at the proper depth.

Brown Aviation Tool Supply sells a twelve-piece set for $15 before shipping, which includes #50, #40, #30, #27, #21, #16, #13, #10, #8, 7/32″, 1/4″ and 5/16″ drill stops. Unfortunately they have a $35 minimum order for the US ($50 minimum for Canada and $100 for the rest of the world). Otherwise you can buy them for $2 each or $9 for a set of four stops (#40, #30, #21, and #12 sizes) before shipping from Avery Tools.

Drill Stops [Avery Tools]
Drill Stop Set [Brown Aviation Tool Supply]

 

6 Responses to Spring-Loaded Drill Stops

  1. Eli-0 says:

    Boeing Surplus (no longer around) in Seattle/Renton WA used to have buckets of drill stops just like these. I remember wondering what the spring was for, now I know!

  2. Jaxx says:

    Unless you get the rubber tipped ones you still need to put masking tape on the tip to prevent scratching, same goes for the edge of your vanmar cage which too many people forget!

  3. Ron says:

    “they cushion the drill when it breaks through”. Geez, I’ve labored under the impression drill stops were used to prevent breaking through. The stuff you learn reading press releases.

  4. @Ron:

    I may have misunderstood the use for these stops.

    In short: the stop in the name probably refers to stopping the chuck from contacting the surface rather than stopping at a set depth.

    I was looking for drill depth stops when I found this product. When I found them the page was talking about using them as depth stops, but the places selling them say they are used to cushion the bit and surface when drilling through sheet metal.

    For instance when you’re drilling through sheet metal you put a bit of downward pressure on the bit, when the bit breaks through, if you’re not careful, you can push the bit in all the way to the chuck — I think that’s the major reason these were designed.

  5. gjc says:

    They are for depth, you use the set screw and set for the depth you want. They are typically used with aircraft drills (6″ length).

  6. Floyd Marchand says:

    I need to order some 7/32 drill stops , how do I order them?

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