Capsid decoration protein that binds as a monomer at the center of each major capsid protein hexamer once maturation and expension of the capsid has occured. It only has a marginal effect on head stability. Dispensable for the head morphogenesis and phage infection. Monomer (PubMed:1469720). Interacts with the major capsid protein; one hoc molecule associates with each hexamer facet (PubMed:1469720, PubMed:11162794, PubMed:20497329). The Hoc protein is the most prominent feature at the virion surface. There are 155 copies on the capsid. Belongs to the Tevenvirinae Hoc family.