B-57 U-frame side lock transversal twistlock
The CONTECH® dovetail or U-frame side twistlock B-57 is a bottom twistlock used in combination with a dovetail or U-frame FR-34, FR-34BQ (elongated) or a double FR-35B/A of 55 degrees to secure the corner castings of containers on board of a vessel. The twistlock is to be used when the sliding direction of the dovetail foundation is rotated 90° to the longitudinal direction of the container.
F1-8L (8R)