head-bolt

head-bolt (plural head-bolts)

1. Alternative form of headbolt
   • 1824, John Johnson, Typographia, Or the Printers' Instructor, page 197:

     The gutters should be cut two or three lines longer than the page; the head-bolts wider; the back furniture may run down to the rim of the chase, but must be level with the top of the page, which will admit of the inner head-bolt running in ; the difference of the outer head-bolt may go over the side-stick, and the gutter will then run up between them.

   • 1876, Specifications and Drawings of Patents Issued from the U.S. Patent Office, page 443:

     The eyes B B are cast solid to the flanged head-bolt D, thereby avoiding the danger of the eyes working apart, as is often the case when the eyes are made in separate parts.

   • 2012, Charles McShane, Classic American Locomotives, →ISBN:

     Screw the head-bolt which compresses the spring up for diminishing or down for increasing the pressure, until the valve opens at the pressure desired, as indicated by the steam gauge; secure the head-bolt in this position by means of the lock-nut; for regulating the loss of escaping steam, turn the screw ring G up for increasing or down for decreasing it.

This form is rarely used except as an attributive form of head bolt.

• Theobald, bolthead