Big Red Box - Enclosure standoff interior hole size

Components & Accessories
1

The Big Red Box - Enclosure has 10 standoffs built into it. The Dimensional Drawing provided does not call out the size of the interior hole for the standoff posts. They appear different than the M4 screw holes also provided for attaching the lid. My calipers are too bulky to fit into the box and grab a nice interior hole diameter measurement.

Does Sparkfun support know the interior hole diameter?

Thanks.

2

I thought on the old website they had a STEP file for this, but I could not find one. However, github (sparkfun/Sparkfun_Big_Red_Box_Proto_Board: Prototyping board for the Big Red Flanged Enclosure) did have the Big Red Box Proto Board which matches the inner holes of the Big Red Box. It shows the inner holes are #4-40 (that also matches the description on the storefront - SparkFun Big Red Box Proto Board - SparkFun Electronics).

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3

There was a step file, but the links didn’t transfer to the new website (or maybe I can’t find them). The file is here: 3D_Models/products/11366/stp at master · sparkfun/3D_Models

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4

Thanks for especially the link to the .step file. I imported it into OnShape and measured that inner diameter.

FYI: standoff inner diameter = 2.5mm = 0.098425in

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