Also snap-head. [f. SNAP sb.]
1. A round head to a rivet, bolt, etc.
1869. Sir E. J. Reed, Shipbuild., xvii. 328. The common form of rivet head employed for shipbuilding is that known as ‘pair’ head; but hemispherical or Snap heads are also used.
1889. Welch, Text Bk. Naval Archit., iv. 75. For machine-riveted work, and occasionally for that put together by hand, snap heads and points … are employed.
attrib. 1874. Thearle, Naval Archit., 128. The snap head rivet, used in machine riveting of beams, boilers, etc.
2. A tool used to shape the head of a rivet.
1875. Knight, Dict. Mech., 1947/2. The end is swaged down by striking directly with a riveting-hammer, or a species of die called a snap-head is interposed.
Hence Snap-headed ppl. a.
1869. Sir E. J. Reed, Shipbuild., xvii. 329. The snap-point is sometimes formed on snap-headed rivets.
