NASM 1312-13 Fastener Double Shear Testing

The Aerospace Industries Association publishes NASM 1312-13, Fastener Test Methods for Double Shear Tests. This standard is focused on the details surrounding double shear testing of fasteners. It also replaced MIL-STD-1312-13A. The test described in this standard can be difficult because the test rate is specified in terms of stress and load, but the rate needs to remain constant throughout the entire test. In addition, total failure of the fastener is undesirable, so break detection and stopping machine movement is critical.