I'm hunting down a socket for a PLCC-84 chip and none of them mention pitch spacing. Is that because PLCC is always the same spacing between pins?
Well, according to this article, yes:
"The PLCC utilizes a "J"-lead with pin spacings of 0.05" (1.27 mm)."
Which is confirmed by this page: the JEDEC standard for PLCC is "1.27mm (50mil) lead pitch".
I did a quick search at JEDEC but only found specification for trays and tubes.