Further information

• General information about spherical plain bearings

  Maintenance-free radial spherical plain bearings

  Maintenance-free radial spherical plain bearings have special sliding layers and are characterized by low friction. They are used in applications with high requirements in terms of service life in maintenance-free operation or in cases of insufficient or no lubrication, as the use of steel/steel bearings is not advisable or impossible in such cases. Above all, however, they are used where bearings are subjected to high, unidirectional forces. Maintenance-free bearings can only be used to a limited extent for bidirectional loads. In addition to roller bearing steel, these bearings are also available in stainless steel, which is corrosion-resistant in oxidizing environments. Maintenance-free radial spherical plain bearings are available in the following sliding pairings:

  • Hard chrome/PTFE sliding pair
  • Sliding pair steel/PTFE fabric

   

  Maintenance requiring radial spherical plain bearings

  Radial spherical plain bearings requiring maintenance are available in steel/steel and steel/bronze sliding pairings. These sliding pairings require regular relubrication. Due to its high wear resistance, the steel/steel sliding pairing is particularly suitable for high loads with changing load directions, shock loads, or high static loads. Bearings with a cylindrically widened inner ring on both sides are designed for bearings with spacer sleeves on both sides, or specifically for the mounting of hydraulic cylinders. Radial spherical plain bearings requiring maintenance are available in the GE..DO, GE..FO, and GE..PB versions.

• Information on sliding pairings

  Sliding pairing: Steel/PTFE composite material

  These bearings are made from high-quality bearing steel, hardened and ground. The sliding surface of the inner ring is hard-chromed. The sliding surface of the outer ring consists of pressed-in PTFE composite material inserts.

   

  Sliding pairing: Hard chrome/PTFE fabric

  These bearings are made from high-quality bearing steel, hardened and ground. The sliding surface of the inner ring is hard-chromed. The sliding surface of the outer ring consists of bonded PTFE fabric inserts.

   

  Sliding pairing: Stainless steel/PTFE fabric

  These bearings are manufactured from high-quality hardenable stainless steel, hardened, and ground. The sliding surface of the outer ring consists of bonded PTFE fabric inserts. The inner ring is spring-fitted into the outer ring in all bearings. This is achieved by splitting the outer ring at a predetermined breaking point. Therefore, these bearings are self-retaining.

• Information about the version with seals.

  Our spherical plain bearing are also available in a double-sealed design (for maintenance-required radial joints only in steel/steel sliding pairs). These bearings are marked with the suffix 2RS. The sealing washers are made of polyester elastomer and prevent coarse contaminants from entering. Upon request, it is also possible to use other sealing materials or equip the bearings with special seals.

• Note on operating temperatures

  The operating temperature of hinge/socket bearings is determined by the sliding pair. For sealed bearings, the operating temperature is additionally limited by the operating temperature of the sealing material. (The temperature range influenced by the seal can also be easily altered by using a different sealing material.) The following temperature ranges are possible for the sliding pair:

  Sliding pair	Operating temperature
  Steel / Steel	-60 °C to +150 °C
  Steel / Steel (sealed)	-30 °C to +130 °C
  Steel / Bronze	-60 °C to +150 °C
  Hard chrome/PTFE fabric	-30 °C to +130 °C
  Hard chrome/PTFE composite material	-50 °C to +150 °C
  Stainless steel/Composite	-30 °C to +130 °C

• Dimensional standards

  Standard, our spherical plain bearings and rod ends conform to DIN ISO 12240. Deviations from the standard are manufactured on request.

• Bearing clearance - dimension tables

  Bearing clearance dimension table for the C series
  Sliding pair: steel / steel
  d		CN		C2		C3
  mm		in μ		in μ		in μ
  above	up to	min.	max.	min.	max.	min.	max.
  300	340	125	239	-	-	-	-
  340	420	135	261	-	-	-	-
  420	530	145	285	-	-	-	-
  530	670	160	320	-	-	-	-
  670	850	170	350	-	-	-	-
  850	1060	195	405	-	-	-	-
  1060	1400	220	470	-	-	-	-
  1400	1700	240	540	-	-	-	-
  1700	2000	260	610	-	-	-	-

  Bearing clearance dimension table for the E series
  Sliding pair: steel / steel
  d		CN		C2		C3
  mm		in μ		in μ		in μ
  above	up to	min.	max.	min.	max.	min.	max.
  2,5	12	32	68	8	32	68	104
  12	20	40	82	10	40	82	124
  20	35	50	100	12	50	100	150
  35	60	60	120	15	60	120	180
  60	90	75	142	18	72	142	212
  90	140	85	168	18	85	165	245
  140	200	100	192	18	100	192	284
  200	240	110	214	18	110	214	318
  240	300	125	239	18	125	239	353

  Bearing clearance dimension table for the G series
  Sliding pair: steel / steel
  d		CN		C2		C3
  mm		in μ		in μ		in μ
  above	up to	min.	max.	min.	max.	min.	max.
  2,5	10	32	68	8	32	68	104
  10	17	40	82	10	40	82	124
  17	30	50	100	12	50	100	150
  30	50	60	120	15	60	120	180
  50	80	72	142	18	72	142	212
  80	120	85	165	18	85	165	245
  120	180	100	192	18	100	192	284
  180	220	110	214	18	110	214	218
  220	280	125	239	18	125	239	353

  Bearing clearance dimension table for the H series
  Sliding pair: steel / steel
  d		CN		C2		C3
  mm		in μ		in μ		in μ
  über	bis	min.	max.	min.	max.	min.	max.
  90	120	85	165	18	85	165	245
  120	180	100	192	18	100	192	284
  180	240	110	214	18	110	214	318
  240	300	125	239	18	125	239	353
  300	380	135	261	-	-	-	-
  380	480	145	285	-	-	-	-
  480	600	160	320	-	-	-	-
  600	750	170	250	-	-	-	-
  750	950	195	405	-	-	-	-
  950	1000	220	470	-	-	-	-

  Bearing clearance dimension table for the K series
  Sliding pair: steel / steel
  d		CN		C2		C3
  mm		in μ		in μ		in μ
  über	bis	min.	max.	min.	max.	min.	max.
  2,5	8	32	68	8	32	68	104
  8	16	40	82	10	40	82	124
  16	25	50	100	12	50	100	150
  25	40	60	120	15	60	120	180
  40	50	72	142	18	72	142	212

  Bearing clearance dimension table for the K series
  Sliding pair: steel / steel
  d		CN		C2		C3
  mm		in μ		in μ		in μ
  über	bis	min.	max.	min.	max.	min.	max.
  2,5	12	32	68	8	32	68	104
  12	20	40	82	10	40	82	124
  20	32	50	100	12	50	100	150
  32	50	60	120	15	60	120	180
  50	90	72	142	18	72	142	212
  90	125	85	165	18	85	165	245
  125	200	100	192	18	100	192	284
  200	250	125	239	18	125	239	353
  250	320	135	261	18	135	261	387

  Bearing clearance dimension table for the K series
  Sliding pair: steel / bronze
  d		CN		C2		C3
  mm		in μ		in μ		in μ
  über	bis	min.	max.	min.	max.	min.	max.
  2,5	6	10	50	4	34	42	72
  6	10	13	61	5	41	52	88
  10	18	16	75	6	49	64	107
  18	30	20	92	7	59	77	120
  30	50	25	112	9	71	98	150

• Tolerances for inner ring and outer ring

  Inner ring tolerance for dimension series C, E, G, H
  D mm		ΔDmp Dimension		VDp	VDmp	ΔCs Dimension
  above	up to	upper	lower	max.	max.	upper	lower
  2,5	18	0	-8	8	6	0	-120
  18	30	0	-10	10	8	0	-120
  30	50	0	-12	12	9	0	-120
  50	80	0	-15	15	11	0	-150
  80	120	0	-20	20	15	0	-200
  120	180	0	-25	25	19	0	-250
  180	250	0	-30	30	23	0	-300
  250	315	0	-35	35	26	0	-350
  315	400	0	-40	40	30	0	-400
  400	500	0	-45	45	34	0	-450
  500	630	0	-50	50	38	0	-500
  630	800	0	-75	75	56	0	-750
  800	1000	0	-100	100	75	0	-1000
  1000	1250	0	-125	125	125	0	-1250
  1250	1600	0	-160	160	160	0	-1600
  1600	2000	0	-200	200	200	0	-2000

  Inner ring tolerance for dimension series K, W
  D mm		ΔDmp Dimension		VDp	VDmp	ΔBs Dimension K		ΔBs Dimension W
  above	up to	upper	lower	max.	max.	upper	lower	upper	lower
  2,5	3	+10	0	10	6	0	-120	0	-100
  3	6	+12	0	12	9	0	-120	0	-120
  6	10	+15	0	15	11	0	-120	0	-150
  10	18	+18	0	18	14	0	-120	0	-180
  18	30	+21	0	21	16	0	-120	0	-210
  30	50	+25	0	25	19	0	-120	0	-250
  50	80	+30	0	30	22	-	-	0	-300
  80	120	+35	0	35	26	-	-	0	-350
  120	180	+40	0	40	30	-	-	0	-400
  180	250	+46	0	46	35	-	-	0	-460
  250	315	+52	0	52	39	-	-	0	-520
  315	400	+57	0	57	43	-	-	0	-570

  Outer ring tolerance for dimension series C, E, G, H, W
  D mm		ΔDmp Dimension		VDp	VDmp	ΔCs Dimension
  above	up to	upper	lower	max.	max.	upper	lower
  6	18	0	-8	10	6	0	-240
  18	30	0	-9	12	7	0	-240
  30	50	0	-11	15	8	0	-240
  50	80	0	-13	17	10	0	-300
  80	120	0	-15	20	11	0	-400
  120	150	0	-18	24	14	0	-500
  150	180	0	-25	33	19	0	-500
  180	250	0	-30	40	23	0	-600
  250	315	0	-35	47	26	0	-700
  315	400	0	-40	53	30	0	-800
  400	500	0	-45	60	34	0	-900
  500	630	0	-50	67	38	0	-1000
  630	800	0	-75	100	56	0	-1100
  800	1000	0	-100	135	75	0	-1200
  1000	1250	0	-125	190	125	0	-1300
  1250	1600	0	-160	240	160	0	-1600
  1600	2000	0	-200	300	200	0	-2000
  2000	2500	0	-250	380	250	0	-2500
  2500	3150	0	-320	480	320	0	-3200

  Outer ring tolerance for dimension series K
  D mm		ΔDmp Dimension		VDp	VDmp	ΔCs Dimension
  above	up to	upper	lower	max.	max.	upper	lower
  5	18	0	11	18	18	0	-240
  18	30	0	-13	21	21	0	-240
  30	50	0	-16	25	25	0	-240
  50	80	0	-19	30	30	0	-300
  80	120	0	-22	35	35	0	-400