R2000 Bearings Selection

Basic Bearing Load Ratings

Shaft Size	Dynamic Capacity	Static Capacity
1 7/16 1 1/2	16,600	18,300
1 11/16 1 3/4	17,300	19,800
1 15/16 2	19,000	22,500
2 3/16	22,400	26,500
2 7/16 2 1/2	33,300	41,100
2 11/16 2 3/4 2 15/16 3	35,500	46,800
3 3/16 3 7/16 3 1/2	56,900	76,400
3 15/16 4	69,900	93,300
4 7/16 4 1/2	91,700	126,000
4 15/16 5	123,000	180,000

Royersford R2000 Spherical Roller Bearings have the capacity to carry substantial radial loads, thrust loads and combined radial/thrust loads. The maximum recommended load which can be applied is limited by the various components of the system, such as bearing, housing, shaft, shaft attachment, speed and life requirements as listed in this catalog.

Select a bearing from the R2000 Selection Chart having a radial load rating at the operating speed equal to or greater than the calculated "Equivalent Radial Load" for a desired L₁₀ Life. This simple method is all that is required for a majority of general applications and provides for occasional average shock loads.

L₁₀ Hours of Life – is the life that may be expected from at least 90% of a given group of bearings operating under identical conditions. To determine L₁₀ hours for loads & RPM's not listed, use the following equation:

Where:
L ₁₀ = Life hours
C = Dynamic Capacity (from table 1)
P = Equivalent Radial Load

If the load on a double row spherical bearing is only in the radial direction (no axial load), the Equivalent Radial Load (P) is equal to the actual radial load. In situations where the bearing load consists of radial and axial (thrust) loads, the total load must be converted into an Equivalent Radial Load by the following equation:

P = XF_R + YF_A

Where:
F _A = Axial (thrust) Load
F _R = Radial Load
X = Radial Load Factor from table 1
Y = Thrust Load Factor from table 1

To find the X and Y values, first calculate FA/FR and compare to the value of e in Table 1. Using the appropriate values for X and Y, substitute all known values into the Equivalent Radial Load equation. The result can then be used to determine the L₁₀ life or compared to the radial load ratings in Table 2. If P is less than F_R use P=F_R If you have only axial (thrust) load, the equivalent radial load P = YF_A where Y is taken from the column for values >e.

The magnitude and direction of both radial and thrust loads must be taken into account when selecting a housing. When pillow blocks are utilized, heavy loads should be directed thru the base. Where a load pulls the housing away from the mounting base, both the hold-down bolts and housing must be of adequate strength. Auxiliary load carrying devices (such as shear bars) are advisable for side or end loading of pillow blocks and radial loads for flanged units.

Shaft Tolerances
Shaft Size	Tolerance
UP TO 1 15/16"	+.0000 -.0005"
2" TO 5"	+.0000 -.0010"

The effectiveness of the shaft attachment to carry a thrust load depends on proper tightening of the set screws, shaft tolerance and shaft deflections. It is advisable to use auxiliary thrust carrying devices (shaft shoulder, thrust collar, snap ring, etc.) to locate the bearing under heavier thrust loads or where extreme reliability is desired (see Table 3 for set screw information).

The shaft tolerances recommended below are adequate for normal radial and radial/thrust load applications. Where the applied radial load exceeds the Maximum Slip Fit Radial Load, a snug-to-light press fit of the shaft is required. Since the allowable load, especially at low RPM, is very large, the shaft should be checked to assure adequate shaft strength.

Table 1 – Radial/Thrust Factors

Shaft Size	e	F_A/F_R ≤ e		F_A/F_R> e		Dynamic Capacity		Static Capacity	Seal Speed Limit RPM	Maximum Allowable Slip Fit Radial Load (F_R) LBS
Shaft Size	e	X	Y	X	Y	Lbs	Newtons	Lbs	Seal Speed Limit RPM	Maximum Allowable Slip Fit Radial Load (F_R) LBS
1 7/16 - 1 1/2	0.28	1.0	2.4	0.67	3.6	16600	73400	18300	2800	2000
1 11/16 - 1 3/4	0.26	1.0	2.6	0.67	3.9	17300	77000	19800	2650	2100
1 15/16 - 2	0.24	1.0	2.8	0.67	4.2	19000	84500	22500	2400	2300
2 3/16	0.24	1.0	2.8	0.67	4.2	22400	99600	26500	2150	2700
2 7/16 - 2 1/2	0.24	1.0	2.8	0.67	4.2	33300	148000	41100	1800	4000
2 11/16 - 3	0.22	1.0	3.0	0.67	4.6	35500	158000	46800	1600	4200
3 3/16 - 3 1/2	0.23	1.0	2.9	0.67	4.4	56900	253000	76400	1300	6800
3 11/16 - 4	0.24	1.0	2.8	0.67	4.2	69900	311000	93300	1200	8400
4 7/16 - 4 1/2	0.25	1.0	2.7	0.67	4.0	91700	408000	126000	1100	11000
4 15/16 - 5	0.26	1.0	2.6	0.67	3.9	123000	547000	180000	900	14800

Table 2 – Easy Selection Table

Shaft Size (Inches)	L₁₀ Life Hours	Radial Load Ratings (Lbs.) at Various Revolutions per Minute
Shaft Size (Inches)	L₁₀ Life Hours	50	100	250	500	1000	1200	1500	1750	2000	2500
1 7/16 - 1 1/2	5000 10000 30000 50000 100000	7365 5980 4300 3690 3000	5980 4860 3495 3000 2435	4545 3690 2655 2275 1850	3690 3000 2455 1850 1500	3000 2435 1750 1500 1220	2835 2305 1655 1420 1155	2655 2155 1550 1330 1080	2535 2055 1480 1270 1030	2435 1975 1420 1220 990	2275 1850 1330 1140 825
1 11/16 - 1 3/4	5000 10000 30000 50000 100000	7675 6235 4485 3845 3125	6235 5065 3640 3125 2535	4735 3845 2765 2370 1925	3845 3125 2245 1925 1565	3125 2535 1825 1565 1270	2955 2400 1725 1480 1200	2765 2245 1615 1385 1125	2640 2145 1540 1320 1075	2535 2060 1480 1270 1030	2370 1925 1385 1190 966
1 15/16 - 2	5000 10000 30000 50000 100000	8430 6845 4925 4225 3430	6845 5560 4000 3430 2785	5200 4225 3035 2605 2115	4225 3430 2465 2115 1720	3430 2785 2005 1720 1395	3245 2635 1900 1625 1320	3035 2465 1775 1520 1235	2900 2355 1695 1450 1180	2785 2260 1625 1395 1135	---- ---- ---- ---- ----
2 3/16	5000 10000 30000 50000 100000	9940 8070 5805 4980 4045	8070 6555 4715 4045 3285	6130 4980 3580 3070 2495	4980 4045 2910 2495 2025	4045 3285 2360 2025 1645	3830 3110 2235 1920 1555	3580 2910 2090 1795 1455	3420 2775 1995 1710 1390	3285 2665 1920 1645 1335	---- ---- ---- ---- ----
2 7/16 - 2 1/2	5000 10000 30000 50000 100000	14775 12000 8630 7405 6015	12000 9745 7010 6015 4885	9115 7405 5325 4570 3710	7405 6015 4325 3410 3015	6015 4885 3510 3015 2445	5695 4625 3325 2850 2315	5325 4325 3110 2665 2165	5085 4130 2970 2545 2070	4885 3965 2850 2445 1985	---- ---- ---- ---- ----
2 11/16 - 3	5000 10000 30000 50000 100000	15750 12795 9200 7895 6410	12795 10390 7475 6410 5205	9720 7895 5675 4870 3955	7895 6410 4610 3955 3210	6410 5205 3745 3210 2610	6070 4930 3545 3040 2470	5675 4610 3315 2845 2310	5420 4400 3165 2715 2205	---- ---- ---- ----	---- ---- ---- ---- ----
3 3/16 - 3 1/2	5000 10000 30000 50000 100000	25250 20510 14750 12655 10275	20510 16655 11980 10275 9345	15580 12655 9100 7805 6340	12655 10275 7390 6340 5150	10275 8345 6005 5150 4180	9730 7905 5685 4875 3960	---- ---- ---- ----	---- ---- ---- ---- ----	---- ---- ---- ----	---- ---- ---- ---- ----
3 11/16 - 4	5000 10000 30000 50000 100000	31020 25165 18120 15545 12625	25195 20465 14705 12625 10255	19140 15545 11180 9590 7790	15545 12625 9080 7790 6325	12625 10255 7375 6325 5140	11955 9710 6980 5990 4865	---- ---- ---- ----	---- ---- ---- ---- ----	---- ---- ---- ----	---- ---- ---- ---- ----
4 7/16 - 4 1/2	5000 10000 30000 50000 100000	40695 33050 23770 20395 16565	66050 26845 19310 16565 13455	25110 20395 14665 12585 10220	20395 16565 11915 10220 8300	16565 13455 9675 8300 6740	15680 12740 9160 7860 6385	---- ---- ---- ----	---- ---- ---- ---- ----	---- ---- ---- ----	---- ---- ---- ---- ----
4 15/16 - 5	5000 10000 30000 50000 100000	54585 44335 31885 27355 22220	44335 36010 25900 22220 18045	33680 27355 19675 16880 13710	27355 22220 15980 13710 11135	22220 18045 12980 11135 9045	---- ---- ---- ---- ----	---- ---- ---- ----	---- ---- ---- ---- ----	---- ---- ---- ----	---- ---- ---- ---- ----

Table 3 - Set Screw Information

Shaft Size	Set Screw		Tightening Torque	Permissible Axial Load
Inches	No.	Size	In-Lbs	Lbs
1 7/16 - 2 3/16	2	3/8"-24	250	515
2 7/16 - 3 1/2	2	1/2"-20	620	900
3 11/16 - 4	2	5/8"-18	1325	1200
4 7/16 - 5	4	5/8"-18	1325	2400