Abstract: An apparatus for feeding and engaging bar stock into an automatic screw machine having at least one clamp, at least one linear actuator, an apparatus for feeding material into the clamps, and a mechanism for facilitating opening and closing the clamps. The clamps include a base portion, pivotally mounted first and second clamping members, and a cam member extending through the base portion which engages the first and second clamping members. The clamps are mounted to a tubular support which rotates in conjunction with the spindle carrier of the automatic screw machine. The mechanism for facilitating opening and closing of the clamps engages an end portion of the at least one linear actuator to displace the cam member. The cam member disengages the clamping members causing the clamping members to open such that the bar stock can be fed into the clamping members and closed thereafter in a positive locking arrangement.