SP81-Spring Hinge
4.0" x 4.0"
4.5" x 4.0"
4.5" x 4.5"

SA81-Single Acting Spring Hinge
6.0" x 4.5"
6.0" x 6.0"
6.0" x 7.0"

DA81-Double Acting Spring Hinge
6.0" x 4.5"