Pars 

I was testing out a spindle I bought (mistakenly), marked 68-SS-F1, in a NR BB. Looks like it will work, other than the NDS arm will be about 1mm further out. When I went to install the NR crank arms, the standard NR bolt (15mm head) would not fit? I've never seen different sizes/threadings for these?

Sutherlands says this is a Xenon spindle, for thick cups (which I have). I would guess 1990 or so?

FBinNY 

To my knowledge, Campy has used the same 8mm crank bolt thread since they first made cotterless cranks 50+ years ago. Any Campy crank bolt will fit. For that matter so will just about any crank bolt you're likely to find. There were a few different threads used by others over the decades, but they're extremely rare, so you'd have to try really hard to go wrong here.

HillRider

The bolt head won't fit into the crank arm recess or the bolt's threads won't thread into the spindle's hole? Like FBinNY mentioned and AFAIK, the threads have been M8x1.0 forever but the bolt head may require a 14 mm hex or an 8 mm allen recessed type.

FBinNY 

Either head will fit any modern crank, but some designs have built-in flange washers, and some require a separate washer. Also there are a few bolts out there with heads too tall for some cranks with limited counterbore depth, but that'll be pretty obvious to the eye.

Pars 

The threading is wrong. Surprised the hell out of me as well

I pulled the spindle and tried it on my workbench. Same, and the same on either end. They barely start, but it is obvious the threading is wrong. Maybe different pitch?

Bolts are Campy (15mm hex head) and are the same as used for years on NR/SR cranks/BBs. Thread into my 68-SS-120 and 68-SS (post CPSC) spindles just fine. perplexed

dsbrantjr

"Maybe different pitch?"

There is an uncommon M8 X 1.25 bolt threading, perhaps that is what you need

Pars 

Just a follow up. I got a different Campy crankset and BB, and was surprised when I took the crank bolts (also Campy) and they threaded easily into the Xenon spindle. After a bit of trying others I had around, the only ones which would not go into the spindle were the original bolts I tried. I thought they were Campy, but the bolt heads don't say so. After comparing pitch, etc., I just took a wrench and put them in with the spindle flats held in a vise. Must have just been slightly different or something. The screw in by hand now, any of them.

HillRider

Actually M8x1.25 is by far the most common thread pitch and M8x1.0 is a more rare fine pitch metric thread. Any hardware store or home center that carries metric bolts will have an assorment of M8x1.25 bolts but finding M8x1.0 is much more difficult.