What do these drawer slide numbers mean?

From Accuride 3800 series full extension slides description:

Side space: .50" +0.062 / -0.0 [12.7mm +1.6 / -0.0]

I thought the side space of the slides is 1/2"? What does the rest of that line mean?

Cheers! Duke

It's the tolerance on the nominal .5" dimension. i.e. the maximum possible width is .5625" and the minimum is .50"

Normally allowable error, so the side space can be 12.7 to 14.3 but not less than 12.7mm

Tim w

That is how much the distance can vary from the specification, and have the side still work.

in other words: you must have a minimum of 1/2" clearance for the slides *and* you can have a maximum of 9/16" clearance for the slides.

(the closer to 1/2" you are, without going _under_ 1/2", the better.)