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draw bolt
draw bolt n. 
/ˈdrɑ ˌboʊlt/ (a) a sliding bolt used to secure a door; cf. drawbar n. 1; (b) the bolt of a coupling mechanism at the end of a railway carriage or other vehicle; cf. drawbar n. 3; (c) any bolt used to clamp parts of a mechanism or assembly tightly together.
Brit. /ˈdrɔː bəʊlt/
, /ˈdrɔː bəʊlt/U.S. /ˈdrɔ ˌboʊlt/
, /ˈdrɔ ˌboʊlt//ˈdrɑ ˌboʊlt/ΚΠ
1809 Hull Packet 19 Sept. Sundry Draw Bolts, Door Springs, &c.
1894 N.Y. Raiload Men May 300/2 An incompetent engineer..breaks couplers, pulls out drawbolts, disarranges the fine machinery of a new locomotive.
1921 E. K. Hammond Production Milling ii. 19 The final step in clamping the work is accomplished by turning a capstan wheel which fits on the threaded end of draw-bolt F.
2015 L. Atherton & L. Schreib Small-Block Chevrolet (rev. ed.) ii. 33 Allow the draw bolt to push against the head of the crank bolt.
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