For the last half century, a common railroad technique for making repairs, where hot rivets were originally used, is the Huck C50L LockBolt from Alcoa. These grade-5 fasteners have cylindrical grooves rather than threads. A 10,000-psi hydraulic gun swages the collar onto the bolt and, when it cannot pull further, breaks the bolt off at a pre-determined point. Huck bolts are permanent. In this video, new bottom ends have been spliced onto the existing collision posts of a 1950 ACF Railroad passenger car.
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