Berry Kercheval said on the Triumphs list:

271(tm) is obsolete, according to the "Loctite User's Guide" I got at the 
bearing shop while picking up bearings for my airplane's nose gear.  
262 replaces it.  They recommend Primer N first, and to use 277 if it's
over 1" diameter.

Here is a table from page 8, Loctite Threadlocker Quick Selector

   Use      Strength  Product          Color
-------------------------------------------------
Small screws	Low	222		Purple
nuts & bolts	Med	242(tm) or 243	Blue
Pre-Assembled	Med	290		Green 
Nuts & Bolts	High	262		Red
Studs (<1")	High	262		Red
Studs (>1")	High	277		Red

They also list a large variety of stuff for restoring stripped threads, sealing pipe fittings, gaskets, setting keys, rustproofing and so on.

Not to sound like a Loctite ad, but you can call 800 323 5106 for "product availability, technical information and material safety data sheets".
THe brocure I have is "LT-1475". 

("Preassembled" means locking adjusting screws in place, and the like)
  --berry

Berry Kercheval :: Xerox Palo Alto Research Center