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.
338 rifles used for this report have floating boltheads that allow 100 percent engagement of the dual locking lugs.