Bolts
- Usually use sizes 8-32, 10-32, and 1/4-20 depending on the application
- Usually use hex key socket heads since they do not strip as easily as others (add pictures)
- Use countersunk/flat heads or button heads if there isn’t clearance (space) to have the socket head
- We use bolts with…
- Nylock nuts, which have a plastic rim to prevent it from loosening as easily as regular nuts
- Rivnuts, which can be fit into regular holes when the other side of the bolt is inaccessible
Pros & Cons
- They are stronger and longer lasting than rivets, but they also add up to a lot of weight. If a mechanism needs to be particularly strong or is expected to take a lot of force (eg. an intake that extends past the bumpers and is prone to hitting against the wall), bolts might be a good choice
- A chart with hole sizes for regular and tapped (threaded) is available here. Reference it to ensure you make the holes the correct size (usually use close fit).
- When designing, you need to make sure there is room to fit the appropriate tools to allow for proper maintenance.
- An allen key (or screwdriver), as well as a wrench (or rivnutter)
Rivets
- Usually use 3/16” or occasionally 1/4” diameter rivets
- Can be aluminum or steel depending on the application (add further explanation)
Pros & Cons
- Are lightweight and easy to replace
- Can quickly loosen or shear off if they take a lot of force in a weak direction (add pictures)
- When designing, you need to make sure there is room to fit the appropriate tools to allow for proper maintenance
- A drill and a riveter