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Sleeve bearings of inch dimensions are almost exclusively dimensioned using the SAE numbering system. The numbering system uses the format -XXYY-ZZ, where XX is the ID in sixteenths of an inch, YY is the OD in sixteenths of an inch, and ZZ is the length in eighths of an inch. [10] Metric sizes also exist. [11]
The bearings are designed to be size-interchangeable with standard bearings. [1] [2] PBC went on to offer ISO metric and JIS metric versions of its bearings in addition to the original imperial sizes. PBC developed pillow block, flanged, and die set bearings as well. The company holds multiple patents. [3]
Tapered roller bearings were a breakthrough at the end of the 19th century because bearings used in wheel axles had not changed much since ancient times. They consisted of a cylindrical seat on the frame and part of the axle enclosed in a case or box that held a lubricant.
Illustration of bearing tolerances (in micrometers) for a bearing with a 20 mm inner diameter. For illustration, the figure shows the differences in tolerance per ABEC class in micrometers (μm) for a 20 mm inner diameter bearing. [1] A 20 mm ABEC 7 bearing only has a 5 μm tolerance window, whereas an ABEC 1 has twice as wide a tolerance.
Thus, the reading for metric micrometers of this type is the number of whole millimeters (if any) and the number of hundredths of a millimeter, as with an ordinary micrometer, and the number of thousandths of a millimeter given by the coinciding vernier line on the sleeve vernier scale.
ISO 2316:1973 Rolling bearings — Metric tapered roller bearings — Bearing width and cup width [Withdrawn: replaced with ISO 355] ISO 2318 Measurement of carbon variation in threads of hardened and tempered bolts, screws, and studs [Rejected draft] ISO 2320:2015 Fasteners — Prevailing torque steel nuts — Functional properties
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