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Details on Popco's aluminum posts & screws

As Popco’s aluminum posts and screws become more popular, a number of customers have asked questions about open-head posts versus closed-head posts. Another common question is about the 3/8-inch maximum screw-size.

Regarding the open-head posts: Small posts (from 1/8 to 3/8-inch) all feature an open-head and the smallest posts are matched with slightly longer screws. The reason is, the longer screw, when fully inserted, fills the post’s open-head (see the photo above).

This chart details the size-matching of aluminum posts & screws

post size screw size
1/8 3/16
3/16 1/4
1/4 1/4
3/8 3/8
1/2 3/8
3/4 3/8
1-inch 3/8

As you can see on the chart, the smallest posts are matched with slightly larger screws. Also, the 3/8 screw is not only matched with the 3/8 post, it is also matched with the 1/2, 3/4 and 1-inch posts. This is because the screw is not meant to thread all the way to the bottom of the longer posts. The photo below shows the large-sized posts, 1/2 to 1-inch, all matched with the 3/8-inch screw.