6321 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 6321. The table retains complete manufacturer designations so special suffixes and different dimensional variants remain visible.
On this page5 sections ⌄
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.
6321 dimensions and recorded technical data
The recorded 6321 base designation measures 105×225×49 mm (inside diameter d × outside diameter D × width B). This answer uses unsuffixed records from SKF, FAG, NSK, KOYO. It does not assign the same dimensions or operating ratings to every suffix.
The numeric series boundary is preserved: a longer number is not included merely because its first digits match. 27 recorded variants are listed. A dash means the value is missing, not zero.
Read the original dimensions for 6321
Boundary size alone does not describe every ring, shoulder or assembled unit. These tables retain the recorded manufacturer labels, symbols, units and limits for each complete marking. Expand a record to check its detailed measurements.
Important: an approximate value, a minimum or a maximum keeps that qualifier. These reference extracts are not CAD drawings, fit recommendations or replacement approvals.
SKF 6321 — 12 dimension fields
Deep groove ball bearing. Source: SKF product catalogue; recorded snapshot 2026-09-02.
Use the complete designation shown here. A seal, cage, clearance or precision suffix can matter even when nominal boundary dimensions match.
Minimum and maximum mounting dimensions are limits, not nominal bearing dimensions. Check shaft/housing shoulders and fillets against the current drawing before designing a seat.
Bearing and component measurements
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Bore diameter | d | 105 mm |
| Deviation limits of mid-range bore diameter | t Δdmp | -0.02 to 0 mm |
| Outside diameter | D | 225 mm |
| Deviation limits of mid-range outside diameter | t ΔDmp | -0.03 to 0 mm |
| Width | B | 49 mm |
| Deviation limits of ring width | t ΔBs | -0.2 to 0 mm |
| Shoulder diameter | d 1 | ≈ 141.5 mm |
| Shoulder diameter | D 1 | ≈ 187.95 mm |
| Chamfer dimension | r 1,2 | min. 3 mm |
Mounting limits and abutments
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Diameter of shaft abutment | d a | min. 119 mm |
| Diameter of housing abutment | D a | max. 211 mm |
| Radius of shaft or housing fillet | r a | max. 2.5 mm |
FAG 6321 — 9 dimension fields
Deep groove ball bearing. Source: Schaeffler medias — FAG; recorded snapshot 2026-09-02.
Use the complete designation shown here. A seal, cage, clearance or precision suffix can matter even when nominal boundary dimensions match.
Minimum and maximum mounting dimensions are limits, not nominal bearing dimensions. Check shaft/housing shoulders and fillets against the current drawing before designing a seat.
Bearing and component measurements
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Bore diameter | d | 105 mm |
| Outside diameter | D | 225 mm |
| Width | B | 49 mm |
| Minimum chamfer dimension | rmin | 3 mm |
| Shoulder diameter outer ring | D1 | 187.92 mm |
| Shoulder diameter inner ring | d1 | 144.3 mm |
Mounting limits and abutments
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Minimum diameter shaft shoulder | da min | 119 mm |
| Maximum diameter of housing shoulder | Da max | 211 mm |
| Maximum fillet radius | ra max | 2.5 mm |
KOYO 6321 — 3 dimension fields
Deep groove ball bearing. Source: JTEKT / Koyo product catalogue; recorded snapshot 2026-09-02.
Use the complete designation shown here. A seal, cage, clearance or precision suffix can matter even when nominal boundary dimensions match.
Bearing and component measurements
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Bore diameter | d | 105 mm |
| Outside diameter | D | 225 mm |
| Width | B | 49 mm |
TIMKEN 6321 — 4 dimension fields
Deep groove ball bearing. Source: Timken official dimensional catalogue; recorded snapshot 2026-10-01.
Metric and inch measurements below are the values published together in this dated manufacturer record. Their displayed rounding is retained; the inch column does not turn a metric design into an inch-series design.
Keep the full marking shown for this record. Equal nominal dimensions do not establish matching closure, clearance, precision, material or operating limits.
Shaft and housing backing-shoulder dimensions, maximum fillet radii and signed offsets answer different installation questions. Preserve the named face, limit and sign; they are not additional bearing outside diameters or nominal widths.
This factual extract is a dimensional reference, not an OEM fitment statement, a replacement approval or a downloadable CAD model.
Bearing and component measurements
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Bore (d) | d | 105 mm |
| O.D. (D) | D | 225 mm / 8.858 in |
| Width (B) | B | 49 mm / 1.929 in |
Mounting limits and abutments
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Max Shaft Fillet Radius | Not supplied separately | 3 mm / 0.118 in |
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) |
|---|---|---|---|---|---|---|
| SKF6321Deep groove ball bearing |
| 182 kN | 153 kN | 6300 rpm | 4000 rpm | 7.97 kg7970 g |
| FAG6321Deep groove ball bearing |
| 188 kN | 150 kN | 4450 rpm | 4050 rpm | 8.7 kg8700 g |
| TIMKEN6321Deep groove ball bearing |
| 184 kN | 153 kN | — | — | 8.05 kg8050 g |
| NSK6321Deep groove ball bearing |
| 202 kN | 154 kN | — | — | 8.09 kg8090 g |
| KOYO6321Deep groove ball bearing |
| 230 kN | 153 kN | — | 2900 rpmLimiting Speeds(Grease Lub.): 2900 min-1Limiting Speeds(Oil Lub.): 3500 min-1 | 8.05 kg8050 g |
| SKF6321/C3Deep groove ball bearing |
| 182 kN | 153 kN | 6300 rpm | 4000 rpm | 7.97 kg7970 g |
| SKF6321/C4Deep groove ball bearing |
| 182 kN | 153 kN | 6300 rpm | 4000 rpm | 7.97 kg7970 g |
| SKF6321 M/C3VL0241INSOCOAT® deep groove ball bearing |
| 195 kN | 153 kN | 6300 rpm | 5600 rpm | 9.12 kg9120 g |
| SKF6321 M/P64S0VL0241INSOCOAT® deep groove ball bearing |
| 195 kN | 153 kN | 6300 rpm | 5600 rpm | 9.12 kg9120 g |
| FAG6321-C3Deep groove ball bearing |
| 188 kN | 150 kN | 4450 rpm | 4050 rpm | 8.7 kg8700 g |
| FAG6321-C4Deep groove ball bearing |
| 188 kN | 150 kN | 4450 rpm | 4050 rpm | 8.7 kg8700 g |
| FAG6321-MDeep groove ball bearing |
| 188 kN | 150 kN | 4450 rpm | 5300 rpm | 9.83 kg9830 g |
| FAG6321-M-C3Deep groove ball bearing |
| 188 kN | 150 kN | 4450 rpm | 5300 rpm | 9.678 kg9678 g |
| FAG6321-M-J20AADeep groove ball bearing |
| 188 kN | 150 kN | 4450 rpm | 5300 rpm | 9.6 kg9600 g |
| FAG6321-M-J20AA-C3Deep groove ball bearing |
| 188 kN | 150 kN | 4450 rpm | 5300 rpm | 9.6 kg9600 g |
| FAG6321-M-J20ABDeep groove ball bearing |
| 188 kN | 150 kN | 4450 rpm | 5300 rpm | 9.6 kg9600 g |
| FAG6321-M-J20AB-C3Deep groove ball bearing |
| 188 kN | 150 kN | 4450 rpm | 5300 rpm | 9.6 kg9600 g |
| FAG6321-M-J20GA-C3Deep groove ball bearing |
| 188 kN | 150 kN | 4450 rpm | 5300 rpm | 9.63 kg9630 g |
| TIMKEN6321-2RS-C3Deep groove ball bearing |
| 184 kN | 153 kN | — | — | 8.11 kg8110 g |
| TIMKEN6321-C3Deep groove ball bearing |
| 184 kN | 153 kN | — | — | 8.05 kg8050 g |
| TIMKEN6321MDeep groove ball bearing |
| 184 kN | 153 kN | — | — | 9.98 kg9980 g |
| TIMKEN6321M-C3Deep groove ball bearing |
| 184 kN | 153 kN | — | — | 9.98 kg9980 g |
| NSK6321DDUDeep groove ball bearing |
| 202 kN | 154 kN | — | — | — |
| NSK6321ZZDeep groove ball bearing |
| 202 kN | 154 kN | — | — | — |
| KOYO6321 2RSDeep groove ball bearing |
| 230 kN | 153 kN | — | 2000 rpmLimiting Speeds(Grease Lub.): 2000 min-1 | 8.05 kg8050 g |
| KOYO6321 2RUDeep groove ball bearing |
| 230 kN | 153 kN | — | 2900 rpmLimiting Speeds(Grease Lub.): 2900 min-1 | 8.05 kg8050 g |
| KOYO6321 ZZXDeep groove ball bearing |
| 230 kN | 153 kN | — | 2900 rpmLimiting Speeds(Grease Lub.): 2900 min-1 | 8.05 kg8050 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 |
|---|---|---|---|---|---|---|
| SKF 6321 | Without | Normal | CN | Sheet metal | Bearing steel | None |
| FAG 6321 | Without — Not sealed | PN — Normal (ISO 492:2023) | CN (Group N) — Normal internal clearance | JN — Steel sheet metal | Not recorded | Without — Bearing not greased |
| TIMKEN 6321 | Open | Not recorded | Not recorded | Steel cage | Not recorded | Not recorded |
| NSK 6321 | Open | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6321 | Open | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| SKF 6321/C3 | Without | Not recorded | C3 | Sheet metal | Bearing steel | None |
| SKF 6321/C4 | Without | Not recorded | C4 | Sheet metal | Bearing steel | None |
| SKF 6321 M/C3VL0241 | Without | Not recorded | C3 | Machined brass | Bearing steel | None |
| SKF 6321 M/P64S0VL0241 | Without | Not recorded | C4 | Machined brass | Bearing steel | None |
| FAG 6321-C3 | Without — Not sealed | PN — Normal (ISO 492:2023) | C3 (Group 3) — Internal clearance larger than CN | JN — Steel sheet metal | Not recorded | Without — Bearing not greased |
| FAG 6321-C4 | Without — Not sealed | PN — Normal (ISO 492:2023) | C4 (Group 4) — Internal clearance larger than C3 | JN — Steel sheet metal | Not recorded | Without — Bearing not greased |
| FAG 6321-M | Without — Not sealed | PN — Normal (ISO 492:2023) | CN (Group N) — Normal internal clearance | M — Solid brass cage, rolling element guided | Not recorded | Without — Bearing not greased |
| FAG 6321-M-C3 | Without — Not sealed | PN — Normal (ISO 492:2023) | C3 (Group 3) — Internal clearance larger than CN | M — Solid brass cage, rolling element guided | Not recorded | Without — Bearing not greased |
| FAG 6321-M-J20AA | Without — Not sealed | PN — Normal (ISO 492:2023) | CN (Group N) — Normal internal clearance | M — Solid brass cage, rolling element guided | Not recorded | Without — Bearing not greased |
| FAG 6321-M-J20AA-C3 | Without — Not sealed | PN — Normal (ISO 492:2023) | C3 (Group 3) — Internal clearance larger than CN | M — Solid brass cage, rolling element guided | Not recorded | Without — Bearing not greased |
| FAG 6321-M-J20AB | Without — Not sealed | PN — Normal (ISO 492:2023) | CN (Group N) — Normal internal clearance | M — Solid brass cage, rolling element guided | Not recorded | Without — Bearing not greased |
| FAG 6321-M-J20AB-C3 | Without — Not sealed | PN — Normal (ISO 492:2023) | C3 (Group 3) — Internal clearance larger than CN | M — Solid brass cage, rolling element guided | Not recorded | Without — Bearing not greased |
| FAG 6321-M-J20GA-C3 | Without — Not sealed | PN — Normal (ISO 492:2023) | C3 (Group 3) — Internal clearance larger than CN | M — Solid brass cage, rolling element guided | Not recorded | Without — Bearing not greased |
| TIMKEN 6321-2RS-C3 | Sealed | Not recorded | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 6321-C3 | Open | Not recorded | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 6321M | Open | Not recorded | Not recorded | Brass cage | Not recorded | Not recorded |
| TIMKEN 6321M-C3 | Open | Not recorded | Not recorded | Brass cage | Not recorded | Not recorded |
| NSK 6321DDU | Contact rubber seals on both sides | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| NSK 6321ZZ | Metal shields on both sides | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6321 2RS | Contact sealed | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6321 2RU | Non-contact sealed | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 6321 ZZX | Shielded ZZ | 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.
6321
Deep groove ball bearing
View full technical record →FAG6321
Deep groove ball bearing
View full technical record →TIMKEN6321
Deep groove ball bearing
View full technical record →KOYO6321
Deep groove ball bearing
View full technical record →NSK6321
Deep groove ball bearing
View full technical record →KOYO6321 2RS
Deep groove ball bearing
View full technical record →TIMKEN6321-2RS-C3
Deep groove ball bearing
View full technical record →KOYO6321 2RU
Deep groove ball bearing
View full technical record →SKF6321/C3
Deep groove ball bearing
View full technical record →FAG6321-C3
Deep groove ball bearing
View full technical record →TIMKEN6321-C3
Deep groove ball bearing
View full technical record →SKF6321/C4
Deep groove ball bearing
View full technical record →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.