A pin clamp for clamping a workpiece, said pin clamp comprising: a housing; a locating pin extending through said housing and having a longitudinal axis, said locating pin being sized to be positioned within an opening of the workpiece; a finger selectively radially extendable from and retractable into said locating pin in a transverse direction relative to said longitudinal axis to retain the workpiece on the locating pin; a sequence bracket attached to said housing; a lock bracket attached to said housing opposite said sequence bracket; a sequence cam including a ledge configured to ride along a top surface of said sequence bracket during a first part of a clamping sequence, said sequence cam further including an engagement surface which engages an angled surface of said lock bracket during a second part of said clamping sequence to lock said locating pin and said finger against the workpiece upon retraction of said locating pin; said sequence cam including an internal cam surface formed therein, and further including a dowel pin and a cam follower associated with said dowel pin, said cam follower positioned within said internal cam surface and interconnecting said dowel pin with said sequence cam, said cam follower engaging said internal cam surface and moving said sequence cam in transverse directions upon movement of said dowel pin; characterized in that, an exterior driving linkage is configured to move said locating pin in opposite directions along said longitudinal axis; said sequence cam is connected with said exterior driving linkage by way of said dowel pin in a manner allowing axial movement of said exterior driving linkage to be converted into transverse movement of said sequence cam perpendicular to said longitudinal axis; and said exterior driving linkage further comprises a bearing plate that is slidable parallel to said longitudinal axis and that carries said dowel pin perpendicular to said longitudinal axis. a housing; a locating pin extending through said housing and having a longitudinal axis, said locating pin being sized to be positioned within an opening of the workpiece; a finger selectively radially extendable from and retractable into said locating pin in a transverse direction relative to said longitudinal axis to retain the workpiece on the locating pin; a sequence bracket attached to said housing; a lock bracket attached to said housing opposite said sequence bracket; a sequence cam including a ledge configured to ride along a top surface of said sequence bracket during a first part of a clamping sequence, said sequence cam further including an engagement surface which engages an angled surface of said lock bracket during a second part of said clamping sequence to lock said locating pin and said finger against the workpiece upon retraction of said locating pin; said sequence cam including an internal cam surface formed therein, and further including a dowel pin and a cam follower associated with said dowel pin, said cam follower positioned within said internal cam surface and interconnecting said dowel pin with said sequence cam, said cam follower engaging said internal cam surface and moving said sequence cam in transverse directions upon movement of said dowel pin; characterized in that, an exterior driving linkage is configured to move said locating pin in opposite directions along said longitudinal axis; said sequence cam is connected with said exterior driving linkage by way of said dowel pin in a manner allowing axial movement of said exterior driving linkage to be converted into transverse movement of said sequence cam perpendicular to said longitudinal axis; and said exterior driving linkage further comprises a bearing plate that is slidable parallel to said longitudinal axis and that carries said dowel pin perpendicular to said longitudinal axis.