PEER radial bearing reference: inch R series, 99502H and special bores

99502H versus 6202-10: equal bore, different outside diameter

Both published rows have a 15.875 mm bore and an 11 mm width. The 99502H outside diameter is printed as 1.375 in and 34.93 mm, whereas 6202-10 is printed as 1.3780 in and 35 mm. These are not identical outside diameters.

The exact conversion of 1.375 in is 34.925 mm. The catalogue rounds its accompanying metric value to 34.93 mm; the table keeps that printed value. Neither number grants a housing-fit tolerance or a substitution approval.

499502H appears as a separate catalogue designation with the same published nominal envelope. The shared envelope does not establish the same internal execution. A 99502HNR, RST, ceramic or application-specific query still needs evidence for that complete execution.

R-series widths and RS suffix questions

The PEER R6 open width is 0.2188 in, while its sealed/shielded width column is 0.2812 in. R8 changes from 0.2500 to 0.3125 in; R12 changes from 0.3125 to 0.4375 in. Bore and outside diameter alone therefore cannot identify the envelope.

The visible R-series illustrations use numeric closure markings such as 7/77 and 9/99. Its dimensional table supplies base numbers and one sealed/shielded width column, not a separate orderable product row for every suffix. This lookup therefore does not manufacture an exact R12RS or R12-2RS record. The 600-series sheet separately illustrates RSP and 2RSP; these must not be silently renamed as another brand’s RS or 2RS.

608 and 6203 special bores are not the standard base bore

The PEER sheet lists 608 with an 8 mm bore, plus 608-3123, 608-3125 and 608-3126 with printed bores of 7.932, 7.9375 and 7.940 mm respectively. Their listed outside diameter and width remain 22 and 7 mm. Do not round these special bores to 8 mm.

For the listed 6203 variants, 6203-6, 6203-8, 6203-10 and 6203-16mm have bores of 9.525, 12.7, 15.875 and 16 mm. The ordinary 6203 row is 17 mm. The suffix is part of the size, not decorative text.

What these technical figures can and cannot answer

The four source sheets carry a 2009 production imprint. They were available from the manufacturer when checked, but that does not make every execution a current product. Verify the current model drawing before an engineering decision.

Cr and Cor are manufacturer-specific catalogue ratings, not allowable service loads. Oil and grease speed columns are shown only where the source explicitly calls them open-bearing limits. They must not be applied to a contact-sealed execution or used as an application speed approval.

No machining drawing, CAD file, precision class, material certificate or cross-brand replacement has been generated. Conflicting dimension rows and unreconciled rating unit pairs are kept out of the corresponding numeric fields rather than corrected by guesswork.