When using the TIME3200 roughness tester for measurement, it is necessary to select the sampling length, which involves the roughness range of the workpiece itself. This table is compiled in the hope that it will be helpful in this regard.
| Ra/μm | Surface microscopic features | Applications | |
| 3.2-6.3 | Semi-gloss surface | Slightly visible processing traces | Semi-finished surfaces, brackets, shafts, bushing end faces, pulleys, cam sides and other non-contact free surfaces, all shaft and hole undercuts, unimportant hinge mating surfaces, etc. |
| 1.6-3.2 | Surfaces that are combined with other parts such as housing, cover, bracket, sleeve, etc. without matching requirements, centering shoulders, keys and keyways, working surfaces of low-speed sliding bearings and journals, tensioning sprockets, matching surfaces of guide roller shell holes and shafts | ||
| 0.8-1.6 | Light Surface | The direction of the processing marks can be identified | The pressed hole surface of bushings, sliding bearings and locating pins, the centering surface of splines; pulley grooves, journals of general low-speed transmissions; metal surfaces before electroplating |
| 0.4-0.8 | Light Surface | Micro-identify the direction of processing marks | Medium-sized machine tools (ordinary precision) sliding guide surfaces, cylindrical pins, tapered pins and rolling bearing matching surfaces; medium-speed rotating shaft necks; centering surfaces of internal and external splines, etc. |
| 0.2-0.4 | The direction of the processing marks cannot be identified | The main surfaces of fixture positioning elements and drill sleeves, high-speed rotating journals of crankshafts and camshafts, important parts subjected to alternating stress during operation, sliding guide surfaces of medium-sized machine tools (to improve precision) and surfaces of /P5 grade rolling bearings. | |
| 0.1-0.2 | Aurora Surface | Dark glossy surface | Precision machine tool spindle taper hole, top conical surface, high-precision gear working surface; and/or P4 grade rolling bearing matching surface; hydraulic cylinder and plunger surface; crankshaft, camshaft working surface, etc. |
| 0.05-0.1 | Bright glossy surface | The holes for the spindle box and sleeve of precision machine tools; the surfaces that bear friction in instruments, such as guide rails, groove surfaces, etc.; the surfaces of holes for hydraulic transmission, the working surfaces of valves, the inner surfaces of cylinders, and the surfaces of piston pins. | |
| 0.025-0.05 | Mirror-like glossy surface | Special precision rolling bearing ring raceways, steel ball and roller surfaces; working surfaces of medium-precision clearance fit parts in measuring instruments; measuring surfaces of working gauges; friction surfaces of friction clutches, etc. | |
