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?
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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.