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The American made Accu Load rail car bolting system, manufactured by BBC Fasteners Inc. is designed for securing side bearing cages and wear plates, center plates, and side column wear plates. The captive washer design consists of a special hardened washer that isolates the bolt head from irregularities in the bearing surface, the company says, adding that the 12-point drive design and special coating ensure accurate clamp loads. These Grade 8 bolts are currently made in three popular sizes: 3/4-inch x 2-3/8-inch, 2-5/8-inch and 3-3/4-inch with other lengths available.