bolthead

bolthead

(ˈbəʊltˌhɛd)
n
1. the head of a bolt
2. a spherical flask with a cylindrical neck, used in chemistry
References in classic literature ?
If I'd a called it a bolthead it would a done just as well.
5 2 Bolt Embossed With Manufacturers Identification Code With Material Property Grade On The Bolthead Face Will Only Be Considered.