jdaddy, start a new thread with that question, it's not particularly related to this one.
As regards the OP ASME Y14.6-2001 "Screw Thread Represenation" shows the space as looselib points out. As well as page 8 all the other examples appear fairly consistent in showing the space.
Section 6.1 of B1.1 - Basic Method of Deignating has the space. However, as JLSeagull points out there are examples that don't follow this, I see several in section 5 with a "-". That said most examples appear to have the space.
There are other minor inconsistencies I'm aware of between these 2 specs, not ASMEs finest work.
I'd go with the space.
KENAT, probably the least qualified checker you'll ever meet...