What is "jag bolt"

Jag \Jag\ (j[a^]g), n. [Prob. of Celtic origin; cf. W. gag aperture, cleft, chink; akin to Ir. & Gael. gag.] [Written also jagg.]

1. A notch; a cleft; a barb; a ragged or sharp protuberance; a denticulation.

   Arethuss arose . . . From rock and from jag.
   --Shelley.

   Garments thus beset with long jags.
   --Holland.

2. A part broken off; a fragment.
   --Bp. Hacket.

3. (Bot.) A cleft or division.

4. A leather bag or wallet; pl., saddlebags. [Scot.]

5. Enough liquor to make a man noticeably drunk; a small ``load;'' a time or case of drunkeness; -- esp. in phr. To have a jag on, to be drunk. [Slang, U. S. & Dial. Eng.]

   Jag bolt, a bolt with a nicked or barbed shank which resists retraction, as when leaded into stone.

n. A bolt with a nicked or barbed shank which resists retraction, as when leaded into stone.