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Thread: What is a #30 Stub in Riveting? Where did the Numbers Come From

  1. #1
    Lionelgee is offline YarnMaster Silver Subscriber
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    What is a #30 Stub in Riveting? Where did the Numbers Come From

    Hello All,

    Part of a project I am currently doing involves riveting. I checked the drill size for my selected 4.1 rivet and the manufacturer recommends using a
    #30 stub or a 3.2 mm diameter drill. Another lot of rivets are the 6.8 rivet which need a #11 stub or a 4.8 mm diameter drill.

    So my questions are:

    What does the 4.1 and 6.8 written on the packages refer to? I circled the 4.1 and the 6.8 in red in the attached photos taken from their pack labels.
    What does the #30 and the #11 stub (drills) signify and where do they get their numbers from?

    When I went to check on my drill kit sizes for the 4.8 mm drill I had a 4.0 a 4.5 and a 5.0 mm diameters. I also checked at the hardware place for the smaller 3.2 mm drill and they had 3.0 and 3.5 mm.

    Are these not readily available 4.8 and 3.2 mm drill diameters really Imperial sizes being quoted on supposedly Metric sized rivets? As in 4.8 mm diameter is 3/16 inch (-0.78% smaller) according to the online conversion accessed 17th June from 4.8 mm to inches. Plus 3.2 MM = 0.32 CM = 0.13 inches = 1/8"


    Kind regards
    Lionel
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    in engineering trades there are number drills used for specific purposes, such as aeroplane rivetting , as well as the linear measured drills vis " and mm

    most engineering supplys stock number drills

  3. #3
    p38arover's Avatar
    p38arover is offline Major part of the heart and soul of AULRO.com
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    As noted above it's a number drill. I have a number of them (sorry about that ). (There are also letter sized drills - see http://www.smithbearing.com/images/p...ionalChart.pdf)

    No. 30 is 0.1285 inches dia. = 3.2639mm (a poopteenth over 1/8")

    Stub means a quite short drill. The fluted section isn't very long.

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    Lionelgee is offline YarnMaster Silver Subscriber
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    Hello Ron & Rambling boy,

    Ron thank you for the link to the drill sizes chart. Pun what pun?

    Thank you Rambling Boy for the information about engineer's numbered drills.

    I did some research into rivets and the 4.1 and 6.8 refer to the outside diameter of the rivet's head. For example, 6.8 equals 6.8 mm diameter.

    Kind regards
    Lionel

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    Lionelgee is offline YarnMaster Silver Subscriber
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    Hello All,

    I did know about "grip range" shown on the rivet packaging. A good explanation of what grip range is can be accessed 17th June 2021 from, Understanding Rivet Grip Range Grip range of a rivet is the range of thicknessGrip range of a rivet is the range of thicknessFastener Superstore Blog | Fastener SuperStore Blog

    The dimensions of rivets which identified the outside diameter provides the 4.1 or 6.8 as 4.1 mm outside diameter of the rivet was sourced from, https://www.ausriveting.com.au/static/pdfs/Rivets.pdf

    Kind regards
    Lionel

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    The rivet size code explained. It's imperial.

    It seems the Americans are calling the shots here with an imperial measurement code. The first number refers to the diameter of the rivet in 32nds of an inch. The second number refers to the maximum grip length in 16ths of an inch. Therefore a size 45 rivet is 4/32" (1/8") diameter with a 5/16" maximum grip range.
    Get you calculator out and work out the numbers for a rivet marked 4.8. It has a Diameter of 3.2mm and a grip length of 12.7mm
    Don.


    Edit: I corrected the number for grip length. D

  7. #7
    Homestar's Avatar
    Homestar is offline Super Moderator & CA manager Gold Subscriber
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    Even Bunnings sells a good range of drills for riveting - I buy the double ended packs in various sizes as I use rivets for a lot of different things from small to stupidly large but ever since I got a cordless rivet gun they make a lot more sense.

    Sutton Tools No.11 Double Ended Panel Drill Bit - 2 Pack - Bunnings Australia
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.

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    Lionelgee is offline YarnMaster Silver Subscriber
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    Quote Originally Posted by Homestar View Post
    Even Bunnings sells a good range of drills for riveting - I buy the double ended packs in various sizes as I use rivets for a lot of different things from small to stupidly large but ever since I got a cordless rivet gun they make a lot more sense.

    Sutton Tools No.11 Double Ended Panel Drill Bit - 2 Pack - Bunnings Australia
    Hello Gav,

    They are the ones that I had bought from the very same supplier - well from the Bundaberg store. It was from reading the rivet label and then walking over to the tools section to track down the #11 and the #30 drills that initially got me wondering about what the "#11 or #30" meant.

    Kind regards
    Lionel

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    Homestar's Avatar
    Homestar is offline Super Moderator & CA manager Gold Subscriber
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    Just finished a job putting some 1/4” stainless rivets in - even the cordless rivet gun grunted doing those. When I first bought it I thought it was a lot of money for something I only had one or two jobs for at the time but I would use it every other week now since I first used it - I’ve changed over to rivets for all sorts of jobs I would have used screws for in the past. Rivets are dirt cheap too compared to screws. What is a #30 Stub in Riveting? Where did the Numbers Come From
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.

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    I don't think anyone has quite pointed out that a #30 drill provides clearance for an 1/8" rivet, a #20 clearance for a 5/32" rivet and a #11 clearance for a 3/16" rivet.

    If you use a 1/8, 5/32, etc drill bit the rivet will likely jam in the hole, whereas the listed number bits are just slightly bigger, allowing a slight clearance so the rivet body can be inserted easily.

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