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Clamp two transmission parts together with the Allison Transmission Bolt, a Hexlock Type B fastener built around an M12 x 1.25 thread. That pitch is finer than the usual coarse thread for a bolt this size, and a finer pitch is slower to loosen under vibration. Its length sets how deep the Allison Transmission 29502097 reaches into the mating part, so length matters as much as diameter. A matched bolt at every position keeps clamp load even around the joint.
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