The MKS Instruments/Newport 481-A is a manual rotation stage engineered for precision angular positioning in optical and scientific applications. It combines 360° continuous coarse rotation with a 5° fine adjustment range, delivering 15 arc seconds sensitivity with the adjustment screw or 30 arc seconds with the micrometer drive. Negligible backlash and a 1° engraved scale with 5 arc minute vernier resolution enable repeatable, accurate component alignment. The stage accommodates 25.4 mm (1 inch) diameter optics with a 19.1 mm clear aperture and 9 mm maximum thickness, supported by two included 25.4 mm retaining rings. A coarse rotation lock thumbscrew secures the position before engaging fine adjustment. Load capacity of 178 N and maximum drive torque of 0.9 Nm suit compact optical bench layouts. The 481-A integrates with optical tables and breadboards via clearance slots, mounts vertically to posts via tapped holes, and accepts motorized actuators (TRA6CC, TRA6PPD, TRB6CC, TRB6PP) for automated applications. Multiple optical mounting options—including 0.5-inch adapters, beamsplitting cube holders, and direct-thread polarizer compatibility—enable flexible component integration.
Technical Specifications
• Model: 481-A
• Type: Manual rotation stage
• Coarse travel: 360° continuous rotation
• Fine travel: 5°
• Drive options: Adjustment screw (100 TPI) or micrometer (40 TPI)
• Sensitivity: 15 arc seconds (adjustment screw) / 30 arc seconds (micrometer)
• Scale graduations: 1°
• Vernier scale: 5 arc minutes
• Backlash: Negligible
• Maximum drive torque: 0.9 Nm
• Load capacity: 178 N (40 lbs)
• Weight: 376 g
• Optic diameter: 25.4 mm (1 inch)
• Clear aperture: 19.1 mm (0.75 inches)
• Optic thickness: 9 mm maximum
• Central aperture thread: 1.063″-20
– Key Features
• Coarse rotation lock thumbscrew for secure position hold
• Engraved degree markings and vernier scale for visual reference
• Two included 25.4 mm retaining rings (Model A-1.25-1RR)
• Accepts 0.5-inch optics with PRA-05 adapter
• Supports 0.5-inch beamsplitting cubes via CH-0.5 holder
• Glan-Laser Calcite Polarizers thread directly into central aperture
• Solid aperture insert (RSA-1TI) for on-axis optical post mounting
– Mounting & Integration
• Breadboard and optical table mounting via clearance slots
• Vertical post mounting using two side-mounted tapped holes
• Compatible threading: 8-32, 1/4-20, M4, M6
• Motorized actuator compatibility: TRA6CC, TRA6PPD, TRB6CC, TRB6PP
• Integrates with Newport linear stages and multi-axis platforms
