Fitting Sizes

Need clarification on the chain link fitting sizes you see on this site? Often, a so-called 2" post actually measures 1 7/8" across. This 1 7/8" measurement is called the post's Outside Diameter, or OD.


To experienced installers, professional contractors, and manufacturers, this is second nature, but for the first-time DIY-er, this can be a little confusing. We strongly urge you to measure your posts and rails before purchasing. We've created this table to help you spot the sizing differences.


Post or Rail Size Outside Diameter (OD) Size
1 3/8" 1 3/8"
1 5/8" 1 5/8"
2" 1 7/8"
2 1/2" 2 3/8"
3" 2 7/8"
3 1/2" 3 1/2"
4" 4"
4 1/2" 4 1/2"
6 5/8" 6 5/8"
8 5/8" 8 5/8"


Still have questions? Call our friendly customer service team today.


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