Hexalobular (Torx) Socket Head Shoulder Screw
The Hexalobular (Torx) Socket Head Shoulder Screw is a precision motion component. The shoulder — the unthreaded section beneath the head — is ground to a very tight diameter tolerance, so it can serve as a pivot, a sliding guide or a locating pin rather than merely as a fastener.
Because the shoulder is ground rather than turned, its surface is smooth and its diameter is consistent along the length. That precision is what allows a linkage to move with controlled clearance, without the play and wear that appear when an ordinary screw shank is used as a bearing surface.
The head uses a hexalobular (Torx) socket, which transmits high torque through a broad contact area without cam-out, so the screw can be tightened securely without damaging the recess. One part therefore positions, pivots and fastens at the same time, reducing the number of components in a mechanism and simplifying its assembly.
Extensively used in automated moulds, precision machine tools, electronic equipment linkages and medical instrumentation, these shoulder screws suit rotating joints that require frequent sliding, pivoting or precise positioning.
They meet the professional demands of complex mechanical systems for high-precision clearance control and long-term motion reliability, including linkage mechanisms that reciprocate continuously in service.
