Black thermoplastic.
Bush and screw steel.

Bush and screw trivalent blue passivated.

Δ Add the desired cap colour code here. No colour code is required for black caps.

Other colours or designs, such as company logo.

Form D: tapped bush without cap
Form G: without bush
Form H: with reamed bush
Form K: tapped bush with cap
Form L: external thread
Form S: hexagon