The FB457 & FB458 ship with a rod threaded at both ends with 1/4-20 thread. The rod is sized for the 12" flush bolt (the 12" designation refers to bolt tip to center of face plate measurement).
The minimum threaded rod length available as a service part for the FB457/458 is the 18" threaded rod, part # 09-161. All the available service replacement rods are all-thread 1/4-20 and can be sized in the field as needed.
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