[Milsurplus] Command Set Screws (SCR-274-N, etc.)

[Jim Whartenby]

RobertDo you think the problem is really with OSHA or EPA?  I see black oxide screws and bolts offered by several manufacturers.  Perhaps it has to do more with market demand?  Especially with the odd #3-48 thread.  The link below will get you 10k for $85!https://www.jetfitting.com/3-48-x-3-8-machine-screws-slotted-pan-head-steel-black-zinc-quantity-10000
Jim I wonder why people argue over the 10% of their differences and ignore the 90% they agree on?

      From: Robert Downs via Milsurplus <milsurplus at mailman.qth.net>
 To: milsurplus at mailman.qth.net 
 Sent: Wednesday, August 22, 2018 6:35 PM
 Subject: [Milsurplus] Command Set Screws (SCR-274-N, etc.)
   
The original cover screws were #3-48 x 7/32" brass black oxide binding head.  The screws for attaching the components inside (capacitors, coils, etc.) were #3-48 x 5/32".  Both had internal star lock washers.  You are unlikely to be able to find any in black oxide because of OSHA and EPA.  And you are unlikely to find any of those exact lengths.  1/4" will do in place of the 7/32" as none of the holes are blind and none will hit anything else inside if they stick out a little.  However, even with internal star lock washers, 3/16" screws may bottom out in the feet on the capacitors so you may have to run a nut onto those and touch the tips to a grinder.  For finish, you can go with cadmium or nickel plating or stainless steel.  If you have a mix of original BO and new, you can blacken the heads of the new ones with Magic Marker ink.  And probably touch up the originals so that they all match.  Ink them before installation so that you don't get ink onto the chassis.

The last time that I bought any, I got them from McMaster.  Delta Fasteners might be another source.

And the first time that I sent this, it went off somewhere in the Google weeds.


Robert Downs



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