FYH NA311 Insert Bearing, 55 mm Bore, Eccentric Collar, 120 mm O.D.
Available
This page covers 6 FYH heavy duty NA300 series insert bearings (NA307 to NA312) with an eccentric locking collar, bore sizes 35 to 60 mm (metric). Choose the size from the drop-down: each variant has its own dimensions, load ratings and mass in the Model Details.
An eccentric collar insert locks to the shaft with a collar that turns against the inner ring. It is the replaceable bearing inside a plummer block (pillow block), flange or take-up unit, and the spherical O.D. seats in a housing with a matching spherical bore.
Where this product is used
- Replacement insert for a plummer block or pillow block unit
- Replacement insert for flange and take-up housings with a matching spherical bore
- Conveyor rollers, drive shafts and idler stations
- Fans, blowers and pumps
- Agricultural, construction and general industrial machinery
Features
- Eccentric locking collar: its elliptical shape engages the matching surface on the wide inner ring, and a set screw is tightened to keep the collar from slipping
- Wide inner ring with a spherical O.D. that suits a wide range of housings
- Grease holes and a grease groove on the outer ring for re-lubrication
- Rubber seal with metal slinger, supplied pre-lubricated with FYH grease
- Basic dynamic load rating Cr 33.4 to 81.9 kN and static rating C0r 19.3 to 52.2 kN (see the Model Details for each size)
Key specifications
| Specification | Detail |
|---|---|
| Type | Insert bearing (deep groove ball bearing) with eccentric locking collar and spherical O.D. |
| Models | NA307 to NA312 (6 sizes) |
| Bore diameter d | 35 to 60 mm (metric) |
| Outer diameter D | 80 to 130 mm |
| Locking | Eccentric locking collar with a set screw |
| Outer ring | Spherical O.D. with grease groove and grease holes |
| Seal | Rubber seal with metal slinger |
| Lubrication | Supplied pre-lubricated with FYH grease |
| Duty | Diameter series 3 (heavy duty) |
| Basic dynamic load rating Cr | 33.4 to 81.9 kN |
| Basic static load rating C0r | 19.3 to 52.2 kN |
| Allowable rotating speed (standard value) | 2,100 to 3,400 rpm |
| Brand | FYH (FYH Inc., Japan) |
Available sizes
| Model | Bore d (mm) | O.D. D (mm) | Width B (mm) | Cr (kN) | C0r (kN) | Speed (rpm) | Mass (kg) |
|---|---|---|---|---|---|---|---|
| NA307 | 35 | 80 | – | 33.4 | 19.3 | 3,400 | – |
| NA308 | 40 | 90 | – | 40.7 | 24 | 3,100 | – |
| NA309 | 45 | 100 | – | 48.9 | 29.5 | 2,700 | – |
| NA310 | 50 | 110 | – | 62 | 38.3 | 2,400 | – |
| NA311 | 55 | 120 | – | 71.6 | 45 | 2,300 | – |
| NA312 | 60 | 130 | – | 81.9 | 52.2 | 2,100 | – |
A dash means the catalogue gives no figure for that exact model number, so none is shown. The catalogue has no row under the designations NA307, NA308, NA309, NA310, NA311 and NA312: O.D., Cr, C0r and f0 are taken from the catalogue row of the same size number, and the width and mass are not shown.
Selecting the right option
Every size on this page has a metric bore (shaft sizes in mm). Match the bore to the shaft you have: an inch shaft needs the imperial version of the same insert, which is a different size.
Fitting and use
Check the load and speed against the catalogue figures in the Model Details before ordering, and apply a suitable safety factor. The allowable rotating speed in the catalogue is a standard value: it falls to 80% for units fitted with covers, and a loose fit between shaft and inner ring reduces it further.
Fit the collar against the inner ring so the eccentric surfaces engage, then tighten the set screw in the collar.
Match the insert to a housing with the same size number: the spherical O.D. seats in a matching spherical housing bore.
If you are unsure which insert suits a shaft and housing, send AIMS the part numbers or sizes and we will confirm the fit.
Related products
Related FYH insert bearing pages: NA200 insert bearings, 3/4 and 1 5/8 in bore (imperial), NA200 insert bearings, 1 to 2 1/4 in bore (imperial) and NA200 insert bearings, 20 to 60 mm bore (metric). Single-model pages in this range: NA311-32.
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FYH NA300 Series Heavy Duty Insert Bearings, Eccentric Collar, 35 to 60 mm Bore (Metric): 55mm
SKU: A0203762 | Model: NA311/FYH
FYH NA311 insert bearing, 55 mm bore, eccentric collar, 120 mm O.D., Cr 71.6 kN. Order online from AIMS Industrial.
