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Thrust Ball Bearings || Dynaroll

THRUST BEARINGS

THRUST BALL BEARINGS

Thrust ball bearings consist of two precision chrome steel washers (ring) and a ball complement spaced by bronze retainer. They can be supplied with or without radius ball grooves in the rings. Thrust bearings are used under purely axial loads.

      
The table below shows available bearings of the type you have selected. Basic dimensions and load ratings are given. To complete the bearing selection process CLICK ON THE PART NUMBER of the bearing that best meets your application (left column). This will take you to the DETAILED SPECIFICATION page where you will make final selection of other important bearing parameters.

THRUST BALL BEARING: Dimensions in mm



Dynaroll Bearing No.* BORE
(d1)
+0/-.008mm
 BORE
(d2)
+0/-.030mm
 OD
(D1)
+0/-.030mm
 OD
(D2)
+0/-.008mm
 Fillet Radius
(r)		 Height
(H)
+0/-.127mm
 Dynamic Rating
(Ca) kgf		 Static Rating
(Coa) kgf		 Limiting Speed**
RPM: Oil		 Limiting Speed**
RPM: Grease
3.0
3.2
7.8
8.0
0.20
3.5
88
79
28,000
19,000
4.0
4.2
8.8
9.0
0.20
4.0
94
118
25,000
17,000
4.0
4.2
9.8
10.0
0.20
4.0
82
79
24,000
16,000
5.0
5.2
9.8
10.0
0.20
4.0
105
118
24,000
15,000
5.0
5.2
11.8
12.0
0.20
4.0
93
105
22,000
14,000
6.0
6.2
11.8
12.0
0.20
4.5
161
187
20,000
14,000
6.0
6.2
13.8
14.0
0.25
5.0
192
206
18,000
12,000
7.0
7.2
14.8
15.0
0.30
5.5
192
206
16,000
11,000
7.0
7.2
16.8
17.0
0.30
6.0
270
321
15,000
10,000
8.0
8.2
15.8
16.0
0.30
5.0
398
345
17,000
11,000
8.0
8.2
18.8
19.0
0.40
7.0
347
419
13,000
9,000
9.0
9.2
16.8
17.0
0.40
5.0
338
421
17,000
11,000
9.0
9.2
19.8
20.0
0.40
7.0
340
419
13,000
8,000
10.0
10.2
17.8
18.0
0.30
5.5
251
277
15,000
10,000
10.0
10.2
19.8
20.0
0.40
6.5
480
637
12,000
8,000

  *Remove M from part number for ungrooved rings.
**Assumes adequate high speed oil or grease; and Dynamic Capacity (Ca)/applied axial load (Ca/Pa >= 12) is equal to or greater than 12
Thrust bearings are separable.
Also available in stainless.
Shaft & Housing Tolerances:
  • Nominal Shaft Diameter: Min: +0.000; Max: -0.009
  • Nominal Housing Diameter: Max: +0.0051; Min: -0.000
Backup Shoulder Diameters:
  • Sufficient surface area is required to provide full support of the bearing rolling elements.
  • The minimum shaft and maximum housing shoulder diameters are as follows:
    • Shaft Shoulder Diameter Minimum = (Bearing ID (d1) + Bearing OD (D2))/2
    • Housing Shoulder Diameter Maximum = (Bearing OD (D2) + Bearing ID (d1))/2
Bearing Race Groove to Bore (d1) Radial Runout: 15 µm maximum
Bearing Race Groove to Backface Axial Runout: 2.5 µm maximum
Lubrication:
  • The bearings must be lubricated either with oil or grease to perform satisfactorily and achieve it's rated dynamic capacity.
  • It is the end user's responsibility to provide for a final lubrication system.
  • For a nominal fee, Dynaroll will lubricate the thrust bearing with an oil or grease selected by the end user.
  • Individual and special packaging is available upon request.
Bearing Preload: The larger of the two values from the equations below should be used as the minimum axial load to prevent ball sliding at relatively high speeds:
  • Fa min = (Coa/100) x (n/N max)2
  • Fa min = Coa/1000
    where
    Fa min:Minimum axial load (kgf)
    n:Speed (rpm)
    Coa:Basic Static Load Rating (kgf)
    N max:Limiting speed (oil lubrication) (rpm)
Bearing Life Calculations:
Ln Life = (A1 x A2 x ...) x (Ca/T)3 x 10
A1, A2, ... Adjustment Factors:
  • Lubrication
  • Temperature
  • Cleanliness/sealing
  • Mounting
  • Environment
  • Reliability
Ca = Dynamic Capacity Rating
  T = Applied Equivalent Dynamic Thrust Load