11,8 mm x 40 mm x 12 mm 11,8 mm x 40 mm x 12 mm FAG 559243 C4 deep groove ball bearingsProducts and services
| Number of Bearings | Single |
| Bearing Material | [Steel] Steel |
| Height H(mm) | 20 ～ 30 |
| Number of Bearings | Single |
| Lateral Width L(mm) | 34 |
| Bearing Retained | Yes (with retaining |
| Housing Material | 304 Stainless Steel |
| Bearing Part Number | 6000 |
| Days to Ship | 8 Days |
| Type | Bearings with Housin |
11,8 mm x 40 mm x 12 mm 11,8 mm x 40 mm x 12 mm FAG 559243 C4 deep groove ball bearings Select
S:19 mm; Recommended tightening torque for set screw:11.5 Nm; C:31.85 kN; s1:24.6 mm; H1:102 mm; L:144 mm; B:49.2 mm; A2:35 mm; T min.:-20 °C; C0:20.8 kN;
Read More ...
Basic Load Rating, Dynamic Rating(N):25700; Basic Load Rating, Static Rating(N):15400; RoHS:6; Rolling Element Material:Bearing Steel; Unit, Type:Insert Bearing Unit; Bearing Inner Dia. Shape:Tapered hole adapter; Surface Treatment:No; Stroke:No; Fit:J7; Bearing Inner Dia. Shape:Tapered hole adapter
Read More ...
Days to Ship:8 Days; Housing Material:1045 Carbon Steel; Holder Surface Treatment:Black Oxide Coating; Bearing Used:Deep Groove Ball Bea; Number of Bearings:Double; Bearing Retained:No; Bearing Part Number:6905; Shape:Flange Type; RoHS:6; Seals:DD (Contact Rubber S;
Read More ...
T min.:-20 °C; G:M6x1; d:53.98 mm; N:M16; Recommended tightening torque for set screw:16.8 Nm; Designation of housing:PG211N-; Dz:110 mm; H2:126 mm; H:63.5 mm; L:140 mm;
Read More ...
Rolling Element Material:Bearing Steel; Surface Treatment:No; Bearing Unit, Type:Square flange shape; Unit, Type:Insert Bearing Unit; Surface Treatment:No; Seal:Triple seals; Stroke:No; RoHS:6; Accessory:With cast iron cover; Basic Load Rating, Static Rating(N):59900;
Read More ...
Inventory:0.0; Category:Roller Bearings; Minimum Buy Quantity:N/A; Nlim (grease):5,100 rpm; Y2:1.98; Y0:1.09; d:36.49 mm; Weight / Kilogram:0; ra max:1.5 mm; Min operating temperature, Tmin:-40 °C;
Read More ...
A2:38.7 mm; A:29.3 mm; s1:17 mm; T min.:-40 °C; T max.:100 °C; B:34 mm; N:11,5mm; G:R1/8"; L:70 mm; A1:11 mm;
Read More ...
Bearing I.D. d(mm):10; Shape:Flange Type; Flange O.D. H(φ):37; Width T(mm):20 ～ 30; Bearing Used:Deep Groove Ball Bea; Bearing Material:[Steel] Steel; Holder Surface Treatment:Electroless Nickel P; Number of Bearings:Double; Number of Bearings:Double; Type:Bearings with Housin;
Read More ...
Outer ring oil hole:Standard; Rolling Element Material:Steel; High-Speed Steel:Standard; Days to Ship:9 Days or more; Number of Raceway Ring Rows:Single Row; Format symbol:NF (one brim for the; Shaft Bore Config.:Cylindrical Bore; High-Speed Steel:Standard; Raceway Ring Shape:Cylindrical Roller; B:2
Read More ...
Max. Allowed rpm(rpm):7900; Inner/Outer Ring Material:Steel; Bearing Style:Open Type; Load Direction:Radial / Thrust; Rolling Element Material:Steel; Accuracy Symbol:P4; Number of Raceway Ring Rows:Single Row; Outer Ring Shape:Flat; Basic Dynamic Load Rating(N):41500; Retainer Type:Punching;
Read More ...
Rolling Element Material:Steel; Outer Ring Type:Flat; Outer Ring Type:Flat; Days to Ship:6 Days or more; Specifications/Environment:Standard; d:90; D:160; Size Standards:Metric System; Load Direction:Radial; Basic Load Rating, Dynamic Rating(N):262000;
Read More ...
Bearing I.D. d(mm):30; Shape:Flanged Pilot Type; Shape:Flanged Pilot Type; Number of Bearings:Double; Bearing Part Number:6906; Number of Bearings:Double; Housing Material:1045 Carbon Steel; Bearing Used:Deep Groove Ball Bea; Width T(mm):35 ～ 70; Flange Shape:Round Type;
Read More ...
Volume Discount:Available; Width T(mm):25; Bearing I.D. d(mm):6; Bearing Used:Deep Groove Ball Bea; Number of Bearings:Double; Seals:DD (Contact Rubber S; Shape:Flanged Pilot Type; Bearing Material:[Steel] Steel; Flange O.D. H(φ):41; Holder Surface Treatment:Clear Anodize;
Read More ...
Bearing Inner Dia. Shape:Cylindrical Bore Set; Unit, Type:Bearing unit; Surface Treatment:No; Unit, Type:Bearing unit; d:45; Surface Treatment:No; Unit Body Material:Cast Iron; Days to Ship:6 Days; Pillow Type, Category:Standard; Seal:No;
Read More ...
Bearing Retained:Yes (with retaining; Flange O.D. H(φ):134; Bearing Material:[Steel] Steel; RoHS:6; Bearing I.D. d(mm):40; Bearing Used:Deep Groove Ball Bea; Seals:VV (Non-Contact Rubb; Type:Bearings with Housin; Bearing Used:Deep Groove Ball Bea; Holder Surface Treatment:Electroless Nickel P;
Read More ...
| 11,8 mm x 40 mm x 12 mm 11,8 mm x 40 mm x 12 mm FAG 559243 C4 deep groove ball bearings cross reference chart |
| d | D | B | Size | Width | Weight | Inventory | Manufacturer Name |
| 559243 C4 | 11,8 mm | 40 mm | 12 mm | 11.8x40x12 | 12 | - | - | - |
| 559243BB-C4-J38E-L25 | - | - | - | - | - | 0.071 | 0.0 | SCHAEFFLER GROUP |
| 559243BB-C3-E138-J37DE-J38E-L25 | - | - | - | - | - | 0.071 | 0.0 | SCHAEFFLER GROUP |
| 559243BB-T-C3-J37DE-J38E-L198-E138 | - | - | - | - | - | 0.07 | 0.0 | SCHAEFFLER GROUP |
| 559243BB-C3-J37DE-J38E-L25-E13 | - | - | - | - | - | 0 | 0.0 | SCHAEFFLER GROUP |
| 11,8 mm x 40 mm x 12 mm 11,8 mm x 40 mm x 12 mm FAG 559243 C4 deep groove ball bearings are basic numbers only. |
| T | C | B | A | F | t | b | G |
| 4306-B-TVH | - | - | - | - | - | - | - | M6x1 |
| B71918-E-2RSD-T-P4S | - | - | - | - | - | - | - | - |
| 713678080 | - | - | - | - | - | - | - | - |
| 23092-B-MB | - | - | - | - | - | - | - | - |
| HCB7030-C-T-P4S | - | - | - | - | - | - | - | - |
| 578718.H84 | - | - | - | - | - | - | - | - |
| 22315-E1 | - | - | 34 mm | 29.3 mm | - | - | - | R1/8" |
| 530292 | - | - | - | - | - | - | - | - |
| 32044-X-N11CA | - | - | - | - | - | - | - | - |
| 23030-E1-K-TVPB + AHX3030 | - | - | - | - | - | - | - | - |
| 239/530-K-MB + AH39/530-H | - | - | 24 | - | - | - | - | - |
| 3211-B-TVH | - | - | - | - | - | - | - | - |
| 30330-A-N11CA | - | - | - | - | - | - | - | - |
| NU2330-E-M1 | - | - | - | - | - | - | - | - |
| 23260-K-MB+AH3260G | - | 31.85 kN | 49.2 mm | - | - | - | - | - |
| 713618660 | - | - | - | - | - | - | - | - |
| 22330-E1-K-T41A + H2330 | - | - | 86 mm | 68 mm | - | - | - | M10x1 |
| 53309 + U309 | - | - | - | - | - | - | - | - |
| NJ424-M1 + HJ424 | - | - | 22 mm | - | - | - | - | - |
| 2309-K-TVH-C3 | - | - | - | - | - | - | - | - |
| 23088-K-MB + AHX3088G-H | - | 31.85 kN | 49.2 mm | - | - | - | - | R1/8" |
| 22264-K-MB + AH2264G-H | - | - | - | - | - | - | - | - |
| 61821-2RSR-Y | - | - | 11 | - | - | - | - | - |
| N240-E-M1 | - | - | - | - | - | - | - | - |
| 23224-E1-K-TVPB + AHX3224A | - | 25.7 kN | - | 34 mm | - | - | - | M6x1 |
| B7019-C-2RSD-T-P4S | - | 43.55 kN | 55.4 mm | - | - | - | - | - |
| 30/6-B-TVH | - | - | - | - | - | - | - | - |
| 22214-E1-K + AH314G | - | 52.5 kN | - | - | - | - | - | M6x1 |
| NJ2306-E-TVP2 + HJ2306-E | - | - | - | - | - | - | - | - |
| 30/8-B-2RSR-TVH | - | - | 112 | - | - | - | - | - |
| 30222-XL | - | 31.85 kN | - | 33 mm | - | - | - | R1/8" |
| RN2319-E-MPBX | - | - | - | - | - | - | - | - |
| 23218-E1A-K-M + H2318 | - | - | - | - | - | - | - | - |
| 713613590 | - | - | - | - | - | - | - | - |
| UC211-34 | - | - | - | 36 mm | - | - | - | - |
| 11205-TVH | - | - | - | - | - | - | - | - |
| NU303-E-TVP2 | - | - | - | - | - | - | - | - |
| 7332-B-MP | - | - | - | - | - | - | - | - |
| 6201-C | - | - | - | - | - | - | - | - |
| 22319-E1-K-T41A + H2319 | - | - | - | - | - | - | - | - |
| 713678500 | - | - | - | - | - | - | - | - |
| 1303-TVH | - | - | 12 | - | - | - | - | - |
| N1936-K-M1-SP | - | 14 kN | - | 21 mm | - | - | - | R1/8" |
| 32038-X-XL-DF-A580-630 | - | - | - | - | - | - | - | - |
| 222SM200-MA | - | - | 49.2 mm | - | - | - | - | - |
| HCB7228-E-T-P4S | - | 12.8 kN | - | 21 mm | - | - | - | R1/8" |
| 2305-K-TVH-C3 | - | 19.5 kN | - | - | - | - | - | - |
| 32330-A | - | 52.5 kN | - | 79.4 mm | - | - | - | - |
| 239/900-K-MB+AH39/900 | - | - | - | - | - | - | - | - |
| 607-2Z | - | 19.5 kN | - | 48 mm | - | - | - | - |
| 3204-B-2RSR-TVH | - | - | - | - | - | - | - | - |
| JK0S060 | - | - | 45.3 mm | - | - | - | - | - |
| 32938-N11CA | - | - | 17 | - | - | - | - | - |
| 54215 | - | - | - | - | - | - | - | - |
| 713615140 | - | - | - | - | - | - | - | - |
| 23032-E1A-K-M + H3032 | - | - | - | - | - | - | - | - |
| 7008-B-TVP | - | - | - | - | - | - | - | - |
| 2212-K-TVH-C3 + H312 | - | - | - | - | - | - | - | - |
| 230/500-B-MB | - | - | - | - | - | - | - | - |
| NU264-EX-TB-M1 | - | - | 30.2 mm | 40 mm | - | - | - | - |
| 22340-E1-K + H2340 | - | - | - | - | - | - | 16.6 mm | - |
| 713618180 | - | - | 7 | - | - | - | - | - |
| 2210-K-TVH-C3 + H310 | - | - | - | - | - | - | - | - |
| SA0030 | - | - | - | - | - | - | - | - |
| 521425 T29 AW220 | - | - | - | - | - | - | - | - |
| S6004 | - | - | 33.4 mm | - | - | - | - | - |
| 231/710-B-K-MB | - | 35.1 kN | - | - | - | - | - | M6x1 |
| QJ304-MPA | - | - | - | - | - | - | - | - |
| 713615220 | - | - | 34 mm | - | - | - | - | M6x1 |
| 713613220 | - | - | - | - | - | - | - | - |
| 20230-K-MB-C3 + H3030 | - | - | - | - | - | - | - | - |
| 713617040 | - | - | - | - | - | - | - | - |
| 24130-E1-2VSR | - | - | - | - | - | - | - | - |
| HC71919-E-T-P4S | - | - | 43.5 mm | - | - | - | - | - |
| 30/6-B-2Z-TVH | - | - | - | - | - | - | - | - |
| 6324 | - | - | 55 mm | - | - | - | - | - |
| 53306 + U306 | - | - | - | 44 mm | - | - | - | - |
| B7028-C-T-P4S | - | 35.1 kN | - | 40 mm | - | - | - | M6x1 |
| 230/800-K-MB | - | 19.5 kN | 30 mm | - | - | - | - | R1/8" |
| 6311-2Z | - | - | 33.3 | - | - | - | - | - |
| 7007-B-2RS-TVP | - | - | 10 | - | - | - | - | - |
| 2205-K-2RS-TVH-C3 | - | - | - | - | - | - | - | - |
| 53315 + U315 | - | - | - | - | - | - | - | - |
| 7221-B-MP | - | - | 15 | - | - | - | - | - |
| HSS7013-C-T-P4S | - | - | 38.1 mm | 37 mm | - | - | - | - |
| 713667310 | - | - | - | - | - | - | - | - |
| F-203482 | - | 25.7 kN | - | 48 mm | - | - | - | - |
| 559243 C4 | - | - | 9 | - | - | - | - | - |
| LS9AC700608 | - | 12.8 kN | - | - | - | - | - | - |
| NU208-E-TVP2 | - | - | 20 mm | - | 19 mm | 1.5 mm | - | - |
| HS71921-C-T-P4S | - | - | 36.5 | - | - | - | - | - |
| 32048-X-XL-DF-A300-350 | - | - | - | - | - | - | - | - |
| 22334-E1-JPA-T41A | - | - | - | - | - | - | - | - |
| HCS71909-C-T-P4S | - | - | 41.2 mm | - | - | - | - | R1/8" |
| 52208 | - | - | - | - | - | - | - | - |
| 239/560-B-K-MB | - | - | - | - | - | - | - | - |
| RN218-E-MPBX | - | - | - | - | - | - | - | - |
| 33005 | - | - | - | 25.4 mm | - | - | - | - |
| B7240-C-T-P4S | - | - | - | - | - | - | - | - |
| B71912-E-T-P4S | - | - | - | - | - | - | - | - |
| 30320-A | - | 25.7 kN | 42.9 mm | - | - | - | - | - |
| 239/750-MB | - | - | - | - | - | - | - | - |
| 3811-B-2RSR-TVH | - | - | 47 | - | - | - | - | - |
| NJ306-E-TVP2 | - | - | - | 51 mm | - | - | - | - |
| S6306-2RSR | - | - | - | - | - | - | - | - |
| 713640420 | - | - | 32.5 mm | 66 mm | - | - | - | - |
| 23052-E1-K + H3052X | - | - | - | - | - | - | - | - |
| 23236-E1-K-TVPB + H2336 | - | - | - | - | - | - | - | - |
| 6313-2Z | - | - | - | - | - | - | - | - |
| 713667740 | - | - | - | - | - | - | - | R1/8" |
| 29252-E1-MB | 25.4 mm | - | - | - | - | - | - | - |
| 6020 | - | - | - | - | - | - | - | - |
| 713640160 | - | - | - | - | - | - | - | - |
| 1215-K-TVH-C3 | - | - | - | - | - | - | - | - |
| 23088-MB | - | - | - | - | - | - | - | M8x1 |
| 23176-K-MB + AH3176G-H | - | - | - | - | - | - | - | - |
| HCS7001-E-T-P4S | - | - | - | - | - | - | - | - |
| 22238-E1-K + AH2238G | - | - | - | - | - | - | - | - |
| 53234-MP + U234 | - | - | - | - | - | - | - | - |
| 21317-E1-K + AHX317 | - | - | - | - | - | - | - | M6x1 |
| 20222-K-MB-C3 + H222 | - | - | - | - | - | - | - | - |
| Z-562658.04.DRGL | - | - | 24 mm | - | - | - | - | - |
| B7024-E-T-P4S | - | - | - | - | - | - | - | - |
| 32316-B | - | - | - | - | - | - | - | - |
| 30309-A | - | 14.29 mm | - | - | - | - | - | - |
| S6002-2RSR | - | - | - | - | - | - | - | - |
| 21318-E1-K + AHX318 | - | - | - | - | - | - | - | - |
| RN2226-E-MPBX | - | - | - | 50.4 mm | - | - | - | R1/8" |
| RN2217-E-MPBX | - | - | - | - | - | - | - | - |
| 7304-B-JP | - | 43.55 kN | 55.6 mm | - | - | - | - | R1/8" |
| HS7017-E-T-P4S | 30 mm | - | - | - | - | - | - | - |
| 22334-E1-K-JPA-T41A | - | - | - | - | - | - | - | - |
| 618/600-M | - | - | - | - | - | - | - | M6x1 |
| 24192-B-MB | - | - | - | - | - | - | - | - |
| 32968-N11CA | - | - | - | - | - | - | - | - |
| 23038-E1-K-TVPB + AH3038G | - | - | - | - | - | - | - | - |
| HCB7207-C-2RSD-T-P4S | - | - | - | - | - | - | - | - |
| 713618160 | - | - | - | - | - | - | - | - |
| NJ205-E-TVP2 + HJ205-E | - | - | - | - | - | - | - | - |
| 51330-MP | - | - | - | - | - | - | - | - |
| 22218-E1 | - | - | 16 mm | - | - | - | - | - |
| 32008-X-XL | - | - | - | - | - | - | - | - |
| 713640080 | - | - | 41.2 mm | - | - | - | - | - |
| 222SM300-MA | - | - | - | - | - | - | - | M6x1 |
| WS22206-E1-2RSR | - | 31.85 kN | 49.2 mm | 48 mm | - | - | - | R1/8" |
| 22338-E1-K + AH2338G | - | - | - | - | - | - | - | - |
| 3207-B-2Z-TVH | - | 52.5 kN | - | - | - | - | - | - |
| NU2308-E-TVP2 | - | - | 31 mm | - | - | - | - | - |
| 29484-E1-MB | - | - | 12 mm | - | - | - | - | - |
| 32038-X-XL-DF-A120-150 | - | - | - | - | - | - | - | - |
| 3213-BD-2HRS-TVH | - | - | - | - | - | - | - | - |
| 23028-E1A-M | - | 12.8 kN | 34 mm | - | - | - | - | - |
| NJ2307-E-TVP2 + HJ2307-E | - | - | - | - | - | - | - | - |
| 24148-E1 | - | - | - | - | - | - | - | M8X1.25 |
| 23152-E1-K + H3152X | - | - | - | - | - | - | - | - |
| 6201 | - | - | - | - | - | - | - | M10x1 |
| 240/560-B-MB | - | - | - | - | - | - | - | - |
| 22317-E1-K + AHX2317 | - | - | - | - | - | - | - | - |
| HSS7026-E-T-P4S | - | - | - | - | - | - | - | - |
| 713644540 | - | - | - | - | - | - | - | - |
| 20224-K-MB-C3 | - | - | 41.2 mm | - | - | - | - | M6x1 |
| 713617260 | - | - | 15 mm | 36 mm | - | - | - | - |
| 2316-M | - | - | - | - | - | - | - | - |
| 54305 | - | - | - | - | - | - | - | - |
| 234430-M-SP | - | - | 55 mm | - | - | - | - | - |
| Z-565672.ZL-K-C5 | - | - | - | - | - | - | - | - |
| 23052-K-MB+AH3052 | - | - | - | - | - | - | - | - |
| 6340-M | - | - | - | - | - | - | - | - |
| 566719 | - | - | - | - | - | - | - | - |
| RN2219-E-MPBX | - | - | - | 40 mm | - | - | - | - |
| 23084-B-MB | - | - | - | - | - | - | - | - |
| 24030-E1-2VSR | - | - | - | - | - | - | - | - |
| NU2338-EX-M1 | 29.37 mm | - | - | - | - | - | - | - |
| HCB7017-C-T-P4S | - | - | - | - | - | - | - | - |
| 29256-E1-MB | - | - | - | - | - | - | - | - |
| 30308-A | - | - | - | - | - | - | - | - |
| F-234976.04 | - | 25.7 kN | - | - | - | - | - | - |
| 23036-E1-K-TVPB + AH3036 | - | - | - | - | - | - | - | - |
| B7000-E-2RSD-T-P4S | - | - | - | - | - | - | - | - |
| 61814-2RSR-Y | - | 12.8 kN | - | - | - | - | - | M6x1 |
| 61912 | - | - | - | 36 mm | - | - | - | - |
| 6024 | - | - | - | - | - | - | - | - |
| 713678330 | - | - | - | - | - | - | - | - |
| 32240-XL-DF-A350-400 | - | - | - | - | - | - | - | - |
| B7230-E-T-P4S | - | 43.55 kN | - | 43 mm | - | - | - | M6x1 |
| 23220-E1A-K-M + AHX3220 | - | - | - | - | - | - | - | - |
| HCB7028-C-2RSD-T-P4S | - | 14 kN | - | - | - | - | - | - |
| NNU4924-S-K-M-SP | - | - | - | - | - | - | - | - |
| 2209-2RS-TVH | - | - | - | - | - | - | - | - |
| 713630470 | - | - | - | - | - | - | - | - |
| 23026-E1A-K-M + AHX3026 | - | - | - | - | - | - | - | - |
| 713690080 | - | - | - | - | - | - | - | - |
| NJ220-E-TVP2 | - | - | - | - | - | - | - | - |
| RW956 | - | - | - | - | - | - | - | - |
| NJ2308-E-TVP2 | - | - | 29 mm | - | - | - | - | - |
| 23322-AS-MA-T41A | - | - | - | - | - | - | - | - |
| 32222-XL | - | - | - | - | - | - | - | - |
| 24052-E1-K30 | - | - | - | - | - | - | - | - |
| HCS7014-C-T-P4S | - | - | - | - | - | - | - | - |
| 23122-E1A-K-M | - | - | 55.4 mm | - | - | - | - | - |
| 21308-E1-K + H308 | - | - | - | - | - | - | - | - |
| B7005-E-T-P4S | - | - | - | - | - | - | - | - |
| NU334-E-M1 | - | - | - | - | - | - | - | - |
| 23040-E1-K-TVPB + AH3040G | - | - | - | - | - | - | - | - |
| 23244-MB | - | - | 42.9 mm | 34 mm | - | - | - | M6x1 |
| 3303-B-TVH | - | - | - | - | - | - | - | - |
| Z-548685.04.DRGL | - | - | - | - | - | - | - | - |
| RN330-E-MPBX | - |
Related News
| timken spherical roller bearing price list
Spherical Roller Bearings - TIMKEN - PDF CatalogsConsult TIMKEN's entire Spherical Roller Bearings catalogue on DirectIndustry. Page: 1/236
Timken - Spherical Roller Bearings / Roller Results 1 - 24 of 142 - Timken 10SF16 Spherical Plain... |
| jtekt koyo number and size chart pdf
Working at JTEKT/Koyo Bearing: Employee Reviews | IndeedAug 8, 2016 - Reviews from JTEKT/Koyo Bearing employees about JTEKT/Koyo Bearing culture, salaries, benefits, work-life balance, management, job
Koyo Bearings (JTEKT) - YouTubeKoyo... |
| miata timken hub catalogue
Timken Wheel Hubs & Bearings for Mazda MX-5 Miata for saleResults 1 - 24 of 206 - Get the best deals on Timken Wheel Hubs & Bearings for Mazda MX-5 Miata when you shop the largest online selection at eBay.com
Timken Front Wheel Hub Change? -... |
English
Shandong Chik Bearing Co., Ltd.2020-07-10 09:46:19
Welcome to my shop! Glad to serve you! Please send your question!
12 mm x 32 mm x 10 mm 12 mm x 32 mm x 10 mm FAG 6201-2RSR deep groove ball bearings
10 mm x 30 mm x 9 mm 10 mm x 30 mm x 9 mm FAG B7200-C-2RSD-T-P4S angular contact ball bearings
FAG 293/950-E-MB thrust roller bearings
280 mm x 460 mm x 180 mm 280 mm x 460 mm x 180 mm FAG 24156-B spherical roller bearings
320 mm x 540 mm x 176 mm 320 mm x 540 mm x 176 mm FAG 23164-E1A-MB1 spherical roller bearings