Outer diameter micrometer — external-dimension measuring instrument designed to measure the distance between the two sides of its square frame by using the helix (screw) principle. It is mainly used for measuring a variety of external dimensions. Key benefits Accurate, repeatable external measurements using a precision helix (screw) mechanism that converts rotational movement into fine linear displacement. Simple mechanical operation: rotate the thimble to close the frame on the part and read the measurement, enabling quick checks without complex setup. Versatile for many external dimension tasks — designed to measure outside diameters, widths, and thicknesses on a wide range of parts. Compact square-frame design provides stable contact and easy positioning on small-to-medium workpieces. What it does and how it solves problems Measures the distance between two contact faces on the square frame, allowing reliable determination of outside dimensions where calipers may be less stable or less precise. Helps reduce scrap and rework by providing consistent dimensional checks during machining, assembly, and inspection. Enables on-bench or shop-floor verification of parts without requiring power or electronics. Important attributes Function: Mechanical outer-diameter micrometer for external dimensions; measurement achieved via helix (screw) principle. Compatibility: Suited to any external dimension measurement within the tool’s measuring range; works with round, square, and flat external features that fit between the frame’s contact faces. Size and form: Square-frame construction for stable seating on the workpiece and easy alignment. Performance: Provides precise, repeatable linear measurement thanks to the screw-driven movement; suitable for routine inspection and in-process checks. Material and durability: Built as a handheld mechanical instrument for shop use (see your specific model/specification sheet for exact materials and ranges). Typical use scenarios Machine shop inspection: Quickly check the outer diameters of turned shafts and rods as they come off the lathe to confirm they meet tolerance before finishing. Assembly and maintenance: Verify replacement shafts, pins, or cylindrical components for fit during equipment service to ensure proper clearance and mating. Quality control and incoming inspection: Confirm external dimensions on incoming parts (bolts, housings, sleeves) to prevent installation issues and maintain assembly quality. Practical notes For best results, ensure contact faces and the workpiece are clean and free of debris before measuring. Use steady, repeatable rotation of the thimble to close the frame and take measurements; follow any calibration or zeroing procedures supplied with your specific model. Refer to the specific model’s technical sheet for measurement range, resolution, and maintenance instructions.