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Thread: 1/4-20 Thread callout

  1. #1
    Associate Engineer
    Join Date
    Nov 2013
    Location
    Katy, TX
    Posts
    1

    1/4-20 Thread callout

    Hello,

    I have a legacy drawing that calls out a 2X .250-20 SL, at two holes from a symmetrical centerline.

    Does anyone know what "SL" means, or if this is a standard abbreviation?

  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,259
    Welcome to EE!

    I'm not sure about the thread specification - as "SL" normally refers to the screw itself as being "Slotted" Straight.

    See: Flat head Slotted Screw
    Last edited by Kelly Bramble; 11-13-2013 at 09:13 PM.

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