Heavy sigh... Yeah, there used to sorta kinda be. Ya just gotta have loved 'em a long time. Used to be that models that start w/ a 6 are stainless, 5 were carbon steel, and 4 were alloy. It's collapsed, in recent years, and they never really did adhere to the rules by renaming many older models.
Below are some of the more popular K, L, and N-frame models and descriptions. (I doubt my tabbing will be effectve.) There are many, many more that are seldom encountered. As the years went by, bbl lengths were added and deleted. Chambers in the cylinders were recessed or not. Barrels were pinned in the frames, or not. The number of screws in the frame/sideplate was changed. Small time revolver collectors despair of EVER getting a reasonable representation of them all.
K-Frames
M10 - .38 Spl, fixed sights, blue or nickel
M12 - Same as M10, but in a lighter alloy
M13 - .357 Mag, fixed sights, blue or nickel
M15 - .38 Spl, adj sights, blue or nickel
M17 - .22LR, adj sights, blue (never saw a nickel) 6" or 8 3/8" bbl
M18 - same as M17, 4" bbl only
M19 - .357 Mag, adj sights, blue or nickel
M48 - .22Mag, blue only (I think) AS
M64 - .38 Spl, fixed sights, stainless
M65 - .357 Mag, fixed sights, stainless
M66 - .357 Mag, adj sights, stainless
M67 - .38 Spl, adj sights, stainless
I've got to start abreviating
L-frames are easy
M581 - .357, B or N, FS
M586 - .357, B or N, AS
M681 - .357, SS, FS
M686 - .357, SS, AS
N-Frames
M24 - .44Spl, B, AS
M624 - as above, SS
M25-2 - .45ACP B (no nickel, I think) AS
M625-2 - as above, SS
M25-5 - Like M25-2, but in .45 Colt
M27 - .357, B or N, AS
M627 - As above, SS
M28 - Similar to M27, but w/ much plainer dull blue finish
M29 - .44Mag, B or N, AS
M629 - as above, SS
[This message has been edited by Hutch (edited April 20, 2000).]