SA204 Bearing Dimensions
SA204 eccentric-collar insert bearing: 20 mm bore, 47 mm spherical OD, 21.5 mm inner ring, 31 mm across the collar. Designation and size-equivalent codes.
SA204 specifications
| Bore d | 20 mm |
|---|---|
| Outside diameter D | 47 mm |
| Inner ring width B | 21.5 mm |
| Width across collar B1 | 31 mm |
| Outer ring width C | 14 mm |
| Seal / shield options | Sealed insert bearing (SA type), spherical outside diameter, eccentric locking collar |
| Material | GCr15 chrome bearing steel (rings and rolling elements) |
| Precision | P0 (standard) |
| Radial clearance | C0 (standard); C3 on request |
| Load ratings | Load ratings for this model are being checked against FULI's catalog. Ask for them with the quote. |
Dimensions cross-checked against published catalogues; please confirm with your quote.
How to read the SA204 designation
| Segment | Meaning |
|---|---|
| SA | Insert bearing with eccentric locking collar and spherical outside diameter; narrow inner ring |
| 2 | 200 series |
| 04 | Bore code 04 → 20 mm bore. ISO bore code (00–03 = 10/12/15/17 mm; 04 and above = code × 5 mm). |
SA204 interchange
SA204 is an eccentric-collar insert bearing. SA inserts are made to common catalogue sizes and lock to the shaft with an eccentric collar instead of set screws in the inner ring. Check the dimensions above against your shaft and housing, or send us the old part number and we confirm the match.
Brand names are trademarks of their respective owners. FULI is not affiliated with, authorized by or endorsed by these companies. Part numbers are shown for interchange reference only. FULI dimensions, load ratings and speeds come from the FULI catalog.
SA204 compared with nearby sizes and housings
SA204 is an eccentric-collar insert for a 20 mm shaft: outside diameter 47 mm, inner ring width 21.5 mm and outer ring width 14 mm. Across the inner ring and collar together it measures 31 mm (B1).
The housed units of the same size code, UCP204 (pillow block unit), UCF204 (square flange unit) and UCFL204 (oval flange unit), are built around the UC204 insert, not SA204. Other inserts with the same size code are UC204 (20 × 47 × 31 mm) and SB204 (20 × 47 × 25 mm).
SA205 is the next larger size in the same series on this site: shaft d 25 mm (5 mm more), outside diameter D 52 mm (5 mm more) and inner ring width B 21.5 mm (the same).
SA203 is the next smaller size in the same series on this site: shaft d 17 mm (3 mm less), outside diameter D 40 mm (7 mm less) and inner ring width B 19.1 mm (2.4 mm less).
| Model | Type | Main dimensions | Weight (kg) |
|---|---|---|---|
| SA204 | insert bearing (this page) | 20 × 47 × 21.5 mm (d × D × B) | — |
| SA203 | insert bearing | 17 × 40 × 19.1 mm (d × D × B) | — |
| SA205 | insert bearing | 25 × 52 × 21.5 mm (d × D × B) | — |
| UC204 | insert bearing | 20 × 47 × 31 mm (d × D × B) | 0.17 |
| SB204 | insert bearing | 20 × 47 × 25 mm (d × D × B) | — |
| UCP204 | pillow block unit | d 20 · H 33.3 · J 95 mm (JIS) | 0.7 |
| UCF204 | square flange unit | d 20 · L 86 · J 64 mm | — |
| UCFL204 | oval flange unit | d 20 · L 113 · J 90 mm | — |
Dimensions in mm from the model pages; weight from FULI's catalog, — = not listed on this site.
SA204 load ratings
FULI's catalog has no load rating line for SA204 itself, so none is given here. Ask us and we send the figures with the quotation.
SA204 dimensions in inches
The nearest common inch shaft size to the 20 mm bore of SA204 is 13/16 in (20.64 mm), 0.64 mm larger than the bore, so SA204 will not go on it. An inch shaft needs an inch bore insert. Inch bore versions are made for some sizes; ask us with the shaft size.
| Dimension | Millimetres | Inches |
|---|---|---|
| Bore d | 20 mm | 0.7874 in |
| Outside diameter D | 47 mm | 1.8504 in |
| Inner ring width B | 21.5 mm | 0.8465 in |
| Width across collar B1 | 31 mm | 1.2205 in |
| Outer ring width C | 14 mm | 0.5512 in |
Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.
Mounting SA204 (general guidance)
General guidance, not a FULI specification: insert bearings slide onto the shaft rather than being pressed on, and are held by their locking device. A shaft ground or drawn to h7 is common; a closer shaft such as js7 or j7 suits higher speed.
SA204 is locked by its eccentric collar: slide the bearing into place, turn the collar on the extended inner ring in the direction the shaft turns until it grips, then tighten the collar screw. Because the collar locks by turning, SA inserts are normally used on shafts that turn one way.
The spherical outside diameter of SA204 lets the insert swivel in the housing seat while it is being mounted, which takes up small errors in shaft line. It does not make the bearing a self-aligning bearing in service.
Grease for SA204
The insert is sealed on both sides and greased at the factory. Fitted in a housing with a grease fitting, it can be relubricated through the housing; on its own it runs on the factory fill.
Greases for a stated temperature range can be specified on the order; for North America a range of −40 to 120 °C is often asked for.
How FULI supplies SA204
FULI supplies SA204 on its own as a replacement insert, or fitted in a housing as a complete unit. The rings and balls are GCr15 chrome steel and the radial clearance is C0 as standard, with C3 on request.
Rings are marked with a brand you are authorised to use, with the FULI brand, or left neutral, as your order states. The box is printed with the model, precision class and brand.
Inquiries that leave out the prefix or suffix letters are the usual cause of a wrong quote, so write the full designation, for example SA204.
Tools and guides for SA204
Typical applications
- Replacement inserts for UCP / UCF / UCFL housings
- Conveyors
- Agricultural machinery
FAQ
What shaft size does SA204 fit?
A 20 mm shaft (0.7874 in).
What is the difference between SA204 and SA205?
SA205 is the next size up, for a 25 mm shaft, with outside diameter D 52 mm (5 mm more) and inner ring width B 21.5 mm (the same). Choose SA205 when the shaft is larger or the load is higher; the housings are not interchangeable.
What is the difference between SA204 and UC204?
Both fit a 20 mm shaft with a 47 mm outside diameter. SA204 has an inner ring 21.5 mm wide and UC204 31 mm. SA204 locks with an eccentric collar; UC204 with set screws. Check that the narrower or wider ring clears the housing and the parts beside it on the shaft.
Can SA204 be ordered on its own?
Yes. SA204 is quoted as an insert bearing on its own, with its eccentric locking collar. Tell us the housing or machine it goes into and we check the fit before quoting.
How is SA204 locked to the shaft?
Slide the bearing onto the shaft, turn the eccentric collar on the extended inner ring in the direction of shaft rotation until it grips, then tighten the set screw in the collar.
Where are the load ratings for SA204?
Load ratings for SA204 are being checked against FULI's catalog and are not shown on this page yet. Model pages with a "Load ratings & speed" table carry values from FULI's catalog.