another chain size question

I've read here on this forum that #415 is the standard chain size. Also, I have read that a #41 and even a #42 chain would work. My question: Is a #41 = to a #410 and is #42 = to 420? I can't find color #415 chains, but I found some color #410's. The chains have the same 1/2" pitch and 1/8" pin diameter but I don't know about roller diameter or roller width to determine if the chain would fit my drive train. Any input/links would be appreciated. I don't mind doing my own research, but sometimes you hit a wall, get dizzy and need need someone to point you in the right direction.:helpsmilie:

 

No.

The all have the same pitch (distance between the center of a roler to the center of the next roller) - the 1st number is a 4, which means that the pitch is 4/8 of an inch (or, 1/2".)

There are two other factors which can come into play: The width of the chain, and the roller/pin diameter. 410 chain is 1/8th inch wide, meaning that it is designed for a sprocket which is 1/8 inch thick. #41 chain, on the other hand is designed for a sprocket which is 1/4 inch thick. Now, #41 chain has a smaller roller diameter (0.306 in) than does #40 (0.312 in) - ref wikipedia. ANSI chain numbers are somewhat confusing, as they evolved over time...

Refer to this table at azusa.com - it has lots of good stuff. According to this table, #415 is the same as #42, and #410 is the same as #43. 415 chain has a width of 3/16 inch.

Also, note the 'tensile strength' column above. This number has to be de-rated for use, especially when you're using a master link. The master link is the weak point on a chain, and when its load rating is exceeded, it bends and 'opens up.' Per the wiki article, the rule of thumb is, for a standard slip-fit master link, to divide the tensile strength by 9 to get a working load figure.