Special fixture for bolt tension test

The utility model relates to a special fixture for bolt tension test, which comprises a bolt head clamp and a screw clamp. The special fixture is characterized in that one end of the bolt head clamp is provided with a tester clamping post, the other end of the bolt head clamp is provided with an internal threaded hole, the middle of the bolt head clamp is provided with a square hollowed-out hole provided with an end face round hole communicated with the internal threaded hole, one end of the screw clamp is provided with an internal threaded hole, and the other end of the screw clamp is provided with a tester clamping post. The special fixture has the advantages that tension test results of bolts with complete-shaped, non-deforming and pollution-free fractures can be obtained by using the special fixture, one fixture can be used for tension test for bolts in different thread specifications and at different performance levels by changing different specifications of thread inserts, risk of thread release is reduced by using the special fixture, test cycle is shortened, and replacement of a tester chuck is avoided and clamping is simple and convenient during use of the special fixture.