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387Symmetric Torque VersionsPart Number Static Torque (Forward and Reverse) Nm (inlbf) Type A Type BST-12A-120SA-33 ST-12A-120SB-33 1.4 (12)ST-12A-200SA-33 ST-12A-200SB-33 2.3 (20)ST-12A-280SA-33 ST-12A-280SB-33 3.2 (28)ST-12A-360SA-33 ST-12A-360SB-33 4.1 (36)Asymmetric Torque VersionsPart Number Static Torque Nm (inlbf)Type A Type B Forward N•m (in•lbf) Reverse Nm (inlbf)ST-12A-200FA-33 ST-12A-200FB-33 2.3 (20) 1.5 (13.6)ST-12A-280FA-33 ST-12A-280FB-33 3.2 (28) 2.2 (19.1)ST-12A-360FA-33 ST-12A-360FB-33 4.1 (36) 2.8 (24.6)ST-12A-440FA-33 ST-12A-440FB-33 5 (44) 3.4 (30)ST-12A-200RA-33 ST-12A-200RB-33 1.5 (13.6) 2.3 (20)ST-12A-280RA-33 ST-12A-280RB-33 2.2 (19.1) 3.2 (28)ST-12A-360RA-33 ST-12A-360RB-33 2.8 (24.6) 4.1 (36)ST-12A-440RA-33 ST-12A-440RB-33 3.4 (30) 5 (44)ACTUAL SIZEwww.southco.com/ST16 (.63)25.4(1.0)2 x Ø 4.2 (.17)Counterbore both sidesØ 8 (.31) 4.2 (.17) deep12(.47)12(.47) 5 (.20)50.9(2.0)12.7(.50)4.7 (.19)11.1 (.44)2 x Ø 4.2 (.17)15 (.59)REVERSE ROTATIONFORWARD ROTATIONREVERSE ROTATIONFORWARD ROTATION12±0.1(.472±.004)4 xØ 4.2±0.1(.165±.004) 27 (1.06)15±0.1(.591±.004)11.05±0.1 (.435±.004) 16±0.1(.630±.004)Hinge centerlineAxialRadialType A Type BDimensions in millimeters (inch) unless otherwise statedST-12A HingePosition control · Constant torque• Smooth, zero backlash operation• Space efficient design provides high torque in minimum space• Constant torque, never needs adjustingMaterial and FinishZinc alloy and steel, natural Performance DetailsRadial load:Maximum static load:1000 N (225 lbf)Axial load:Maximum static load:1200 N (270 lbf)Cycle performance:20,000 cycles within ±20% of static torque specificationInstallation Notes1. Install hinge using M4 (No. 8) socket head cap screw.2. For proper function, assembly must include (1) type A and (1) type B hinge.Part NumberSee table