These zinc plated square nuts are carbon steel fasteners with a square body, four chamfered corners and a chamfered top edge, finished in a blue-white zinc coating. The square form does the work: pulled into a timber pocket or held flat against a plate, the nut cannot spin, so one wrench on the bolt is enough. That is why square nuts for timber frame construction are paired with coach bolts, washers and connector plates in decks, fences and frame joints. As GB standard square nuts, the geometry follows the GB designation named in the product title, while the standard number and property class are confirmed on the drawing. Coating, chamfer, thread and packaging can be customized.