The square neck pulls into timber or a square hole and locks the bolt against turning, so you can tighten the nut single-handed from one side. The domed head leaves nothing to catch on. The galvanised coating gives solid outdoor corrosion protection at a fraction of the cost of stainless.
Typical uses
Playground and bench construction
Anywhere only one side is reachable
Timber framing and decking
Gates, fencing and hoarding
Manufactured to DIN 603. Dimensions, thread form and head geometry follow the standard, so it interchanges with any other DIN 603 part of the same size regardless of who made it.
