ISO 08B roller chain offset link (half link), 12.7 mm pitch

chain-half-link

Use it

(import "parts/chain/CHAIN-08B-HALF.ik" as p)

In a design on ink: ask your agent for it by name, or by what it must be.

Frame of reference

Axis z and center plane z=0; chain first pin at origin and pitch+x; sprocket gap+y, B hub+z.