These hexagonal male-female aluminum standoffs are intended specifically for use with the Raspberry Pi. They keep parts spaced18.6 mm apart, which is just the right height for mounting expansion boards with extra-tall female headers, and they have M2.5 threadsthat are just the right size for the Raspberry Pi’s mounting holes. These standoffs are sold in packs of 4.
These aluminum hexagonal standoffs match the height of our extra-tall 2×20 female headers and can be used to mount expansion PCBs and HATs so that they clear all of the components on the Raspberry Pi Model A+ and Model B+ as well as the Raspberry Pi 2 Model B. The body of each male-female standoff is 18.6 mm long (dimension L in the mechanical drawing on the right) by 4 mm wide. The male threads extend another 6 mm past the standoff body, and the female threads extend at least 6.35 mm into the body. You can easily screw multiple units together to make longer standoffs. The threads are M2.5 on both ends, since this matches the size of the Raspberry Pi mounting holes. We carry M2.5 nuts and 6 mm M2.5 screws separately.
We also carry 11mm-long standoffs that match the height of our standard-size 2×20 female headers and can be used to compactly mount expansion boards to a Raspberry Pi.