320/28JR bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 320/28JR. The table retains complete manufacturer designations so special suffixes and different dimensional variants remain visible.
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Find by measured dimensions
Enter bore d, outside diameter D and width B. Use decimals or inch fractions such as 1/2 or 1 1/4.
320/28JR dimensions and recorded technical data
Use the named dimensions for each complete record below. A generic d×D×B answer is not asserted where the base record is missing, dimension symbols are unverified, or the product uses a different geometry such as a housing or thrust assembly. Suffix records are not substituted for a missing base specification.
The numeric series boundary is preserved: a longer number is not included merely because its first digits match. 2 recorded variants are listed. A dash means the value is missing, not zero.
Catalogue parameters for 320/28JR
Choose the complete brand and marking before reading a value. These source-labelled records add dimensions, construction and engineering properties where they were recorded; a shared model number does not establish interchangeability.
Units, ranges and minimum/maximum qualifiers are retained. The data is a dated catalogue reference, not a certified drawing, a complete current specification or an operating approval.
KOYO 320/28JR — 25 recorded parameters
Tapered roller bearing
Reference: JTEKT / Koyo catalogue; source snapshot 2026-09-02.
Keep total assembly width distinct from inner- and outer-ring widths. The same nominal bore does not establish a matching cup/cone set.
Values shown are retained from the recorded source. Zero boundary dimensions and zero load ratings from incomplete legacy feeds are withheld rather than presented as usable specifications.
Technical Data
| Parameter | Source symbol | Recorded value |
|---|---|---|
| d | Not separately recorded | 28 mm |
| D | Not separately recorded | 52 mm |
| T | Not separately recorded | 16 mm |
| B | Not separately recorded | 16 mm |
| C | Not separately recorded | 12 mm |
| R(Min.) | Not separately recorded | 1 mm |
| R1(Min.) | Not separately recorded | 1 mm |
| Basic Load Ratings : Cr | Not separately recorded | 44.1 kN |
| Basic Load Ratings : C0R | Not separately recorded | 44.0 kN |
| Fatigue Load Limit : Cu | Not separately recorded | 6.10 kN |
| Limiting Speeds(Grease Lub.) | Not separately recorded | 7500 min-1 |
| Limiting Speeds(Oil Lub.) | Not separately recorded | 10000 min-1 |
| Load Center Spread : A | Not separately recorded | 12.7 mm |
| Constant E | Not separately recorded | 0.43 |
| Axial Load Factors : Y1 | Not separately recorded | 1.39 |
| Axial Load Factors : Y0 | Not separately recorded | 0.77 |
| Da(Min.) | Not separately recorded | 45 mm |
| Db(Max.) | Not separately recorded | 33 mm |
| Da(Max.) | Not separately recorded | 46.5 mm |
| Db(Min.) | Not separately recorded | 49 mm |
| Sa(Min.) | Not separately recorded | 3 mm |
| Sb(Min.) | Not separately recorded | 4 mm |
| Ra(Max.) | Not separately recorded | 1 mm |
| Rb(Max.) | Not separately recorded | 1 mm |
| Mass(Refer.) | Not separately recorded | 0.150 kg |
No recorded variant matches these filters. Clear a filter to see other records; no substitute has been inferred.
| Brand / full designation | Named dimensions (mm / in) | Dynamic C (kN) | Static C0 (kN) | Reference speed (rpm) | Limiting speed (rpm) | Mass (kg / g) |
|---|---|---|---|---|---|---|
| KOYO320/28JRTapered roller bearing |
| 44.1 kN | 44 kN | — | 7500 rpmLimiting Speeds(Grease Lub.): 7500 min-1Limiting Speeds(Oil Lub.): 10000 min-1 | 0.15 kg150 g |
| KOYO32028JRTapered roller bearing |
| 435 kN | 585 kN | — | 1700 rpmLimiting Speeds(Grease Lub.): 1700 min-1Limiting Speeds(Oil Lub.): 2200 min-1 | 5.28 kg5280 g |
Compare recorded seals, clearance, precision and materials
Manufacturer wording is retained. A missing property is not inferred from another brand or a similar suffix.
| Brand / designation | Closure | Original precision | Clearance | Cage | Material | Lubricant |
|---|---|---|---|---|---|---|
| KOYO 320/28JR | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 32028JR | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
How to compare these values
- Use the displayed dimension names and original symbols. Housing length L, height H2 and flange width are not bearing outside diameter D. A catalogue width with an unverified symbol must not be assumed to be inner-ring width B or assembly width T. Open the product record for mounting dimensions and geometry.
- Inch values are calculated from the recorded millimetres using 25.4 mm per inch, rounded to six decimal places. They do not change a metric bearing into an inch-series bearing. Gram values are converted from the recorded mass in kilograms.
- C and C0 describe different rating conditions. They are not a single safe working-load limit and cannot replace an application load calculation.
- Reference and limiting speeds are separate catalogue values. The source grease/oil context is shown where recorded. Lubricant, seals, loads, fit, clearance and cooling affect the usable operating speed.
- A common base number does not prove equivalent seals, clearance, precision, material or interchangeability. Open the full designation for these fields.
Related prefix matches — other model numbers may appear
These discovery results can contain a longer number or a different component. They are not specifications for the requested exact model. Open the complete product to inspect its original geometry.
Check the drawing before substituting
Nominal dimensions are not shaft-fit tolerances. Different variants can add grooves, flanges, wider rings or assembly components. When the table has different dimensions, the complete designation—not the shared prefix—controls.
Reference basis & data limits
Manufacturer terminology is retained in the product records. Technical reference basis: JTEKT Basic Bearing Knowledge (boundary dimensions, tolerance classes and lubrication); NSK Bearing ABCs (lubrication, designations and clearance); NTN technical FAQs (closure codes and component interchange); SKF rolling-bearing selection and maintenance references.
Selection workflows and catalogue grouping are BearingScope editorial aids. Verify the current drawing and application requirements before using a candidate. Missing database information is not converted into an assumed match.