I have to install timber bolts on a steel bearing surface. Am I able to order timber bolts without steel nubs underneath the heads?
Timber bolts, also referred to dome head bolts and as economy bolts in the Pacific Northwest, are designed with two nubs (or sometimes fins) on the underside of the head which bite into wood and prevent the head from spinning in the timber. The nubs under the head require a wood bearing surface to bite into, making a steel bearing surface incompatible with a timber bolt head.
However, timber bolts can be custom manufactured without nubs underneath the head of the bolt, allowing the bolt head to rest flush against the steel plate. The steel nubs under the head are formed during the hot-forging process when the bolt head is created. If Portland Bolt is instructed to manufacture a timber bolt with no nubs by the customer at the time of purchase, we are able to instruct our machine operators to forge a timber bolt without nubs.