A reload assembly for a surgical stapling device, the reload assembly comprising: a shell housing including an outer housing portion and an inner housing portion, the inner and outer housing portions defining an annular cavity therebetween; a staple cartridge supporting a plurality of staples supported on the shell housing; a staple pusher supported within the annular cavity and movable from a retracted position to an advanced position to eject staples from the staple cartridge; a staple actuator supported within the annular cavity and having a stop surface and an angled inner surface, the staple actuator positioned to engage the staple pusher and movable from a retracted position to an advanced position to move the staple pusher from its retracted position to its advanced position, the staple actuator and the staple pusher defining a through bore; a knife carrier supported within the through bore and movable between a retracted position and an advanced position, the knife carrier defining a longitudinal axis and including at least one hook member having a proximal end, the at least one hook member being aligned with the stop surface of the staple actuator to prevent advancement of the knife carrier prior to advancement of the staple actuator; and a knife supported on the knife carrier, characterized in that the knife carrier further comprises at least one locking tab disposed on the at least one hook member distal of the proximal end thereof, the at least one locking tab comprising a proximal-facing angled surface and a distal-facing locking surface, wherein: the at least one locking tab is positioned distally of the stop surface on the staple actuator when the staple actuator is in its retracted position so as to permit advancement of the knife carrier following advancement of the staple actuator; the proximal facing angled surface of the at least one locking tab is configured to engage the angled inner surface of the staple actuator as the knife carrier is moved proximally from its advanced position to its retracted position when the staple actuator is in its advanced position, the hook member having the at least one locking tab thereon being configured to deform radially inwardly away from the staple actuator when the at least one locking tab engages the angled inner surface to enable the at least one locking tab to pass radially inwardly and move proximally beyond the stop surface of the staple actuator, and the hook member having the at least one locking tab thereon is configured to spring outwardly to its undeformed state when the at least one locking tab moves proximally beyond the stop surface of the staple actuator to prevent readvancement of the knife carrier by engagement of the locking surface of the at least one locking tab with the stop surface on the staple actuator. a shell housing including an outer housing portion and an inner housing portion, the inner and outer housing portions defining an annular cavity therebetween; a staple cartridge supporting a plurality of staples supported on the shell housing; a staple pusher supported within the annular cavity and movable from a retracted position to an advanced position to eject staples from the staple cartridge; a staple actuator supported within the annular cavity and having a stop surface and an angled inner surface, the staple actuator positioned to engage the staple pusher and movable from a retracted position to an advanced position to move the staple pusher from its retracted position to its advanced position, the staple actuator and the staple pusher defining a through bore; a knife carrier supported within the through bore and movable between a retracted position and an advanced position, the knife carrier defining a longitudinal axis and including at least one hook member having a proximal end, the at least one hook member being aligned with the stop surface of the staple actuator to prevent advancement of the knife carrier prior to advancement of the staple actuator; and a knife supported on the knife carrier, the at least one locking tab is positioned distally of the stop surface on the staple actuator when the staple actuator is in its retracted position so as to permit advancement of the knife carrier following advancement of the staple actuator; the proximal facing angled surface of the at least one locking tab is configured to engage the angled inner surface of the staple actuator as the knife carrier is moved proximally from its advanced position to its retracted position when the staple actuator is in its advanced position, the hook member having the at least one locking tab thereon being configured to deform radially inwardly away from the staple actuator when the at least one locking tab engages the angled inner surface to enable the at least one locking tab to pass radially inwardly and move proximally beyond the stop surface of the staple actuator, and the hook member having the at least one locking tab thereon is configured to spring outwardly to its undeformed state when the at least one locking tab moves proximally beyond the stop surface of the staple actuator to prevent readvancement of the knife carrier by engagement of the locking surface of the at least one locking tab with the stop surface on the staple actuator.