These Koyo B series drawn cup needle roller bearings have a full complement of needle rollers in a drawn steel cup with open ends, in inch series sizes. Drawn cup needle roller bearings support radial loads and reduce friction between rotating components, with a drawn steel outer cup that serves as the raceway for the needle rollers. The small cross-section gives high load-carrying capability in minimum space, and the bearing is installed with a press fit in the housing. Drawn cup bearings suit compact, economical designs where it is not practical to harden and grind the housing bore, or where the housing material has low rigidity, such as cast iron, aluminium or plastics. The original drawn cup design combines maximum load-carrying capability with the advantages of the drawn outer ring. The inward-turned lips of the cup mechanically retain the full complement of needle rollers, which gives positive radial retention even when the shaft is removed repeatedly during servicing. The range has 69 inch series sizes with needle roller complement bore diameters from 6.35 to 69.85 mm. Koyo bearings are made by JTEKT Corporation. Where this product is used Transmissions and transfer cases Engines and valve trains Steering and braking systems Axle supports Outboard engines Power tools Copiers, fax machines and paper-moving equipment Appliances Features Full complement of needle rollers: maximum radial load-carrying capability for the size Drawn steel cup raceway pressed into the housing: compact cross-section and economical mounting without a hardened, ground housing bore Basic dynamic load rating C 3.55 to 68.8 kN and basic static load rating C0 3.68 to 191 kN Matching IR and IRA series inner rings are available in the Koyo range where the shaft cannot be hardened and ground Key specifications Specification Detail Type Full complement of needle rollers, open ends Series Inch Needle roller complement bore diameter Fw 6.35 to 69.85 mm Outside diameter D 11.113 to 79.375 mm Width C 7.92 to 31.75 mm Basic dynamic load rating C 3.55 to 68.8 kN Basic static load rating C0 3.68 to 191 kN Approximate weight 0.003 to 0.166 kg Brand Koyo (JTEKT) Available sizes Show all 69 sizes Designation Fw (mm) D (mm) Width C (mm) C (kN) C0 (kN) Weight (kg) B-45 6.35 11.113 7.92 3.55 3.68 0.003 B-47 6.35 11.113 11.13 5.51 6.46 0.004 B-55 7.938 12.7 7.92 4.08 4.6 0.004 B-56 7.938 12.7 9.53 5.23 6.33 0.005 B-66 9.525 14.288 9.53 5.83 7.61 0.005 B-67 9.525 14.288 11.13 7.06 9.72 0.006 B-68 9.525 14.288 12.7 8.21 11.8 0.007 B-69 9.525 14.288 14.27 9.33 13.9 0.007 B-610 9.525 14.288 15.88 10.4 16 0.008 B-78 11.113 15.875 12.7 8.97 13.8 0.008 B-710 11.113 15.875 15.88 11.4 18.7 0.01 B-85 12.7 17.463 7.92 5.36 7.38 0.005 B-86 12.7 17.463 9.53 6.87 10.2 0.006 B-87 12.7 17.463 11.13 8.31 13 0.007 B-88 12.7 17.463 12.7 9.63 15.7 0.009 B-810 12.7 17.463 15.88 12.2 21.3 0.01 B-812 12.7 17.463 19.05 14.7 26.9 0.013 B-96 14.288 19.05 9.53 7.33 11.4 0.007 B-98 14.288 19.05 12.7 10.3 17.7 0.009 B-910 14.288 19.05 15.88 13.1 24 0.012 B-912 14.288 19.05 19.05 15.6 30.3 0.014 B-108 15.875 20.638 12.7 10.9 19.7 0.01 B-1010 15.875 20.638 15.88 13.8 26.7 0.013 B-1012 15.875 20.638 19.05 16.6 33.7 0.015 B-116 17.463 22.212 9.53 8.17 14 0.008 B-118 17.463 22.212 12.7 11.5 21.7 0.011 B-1110 17.463 22.212 15.88 14.6 29.4 0.014 B-1112 17.463 22.212 19.05 17.4 37.1 0.016 B-126 19.05 25.4 9.53 9.7 13.6 0.012 B-128 19.05 25.4 12.7 14.1 22 0.016 B-1210 19.05 25.4 15.88 18.1 30.4 0.02 B-1212 19.05 25.4 19.05 21.9 38.7 0.024 B-136 20.638 26.988 9.53 10.1 14.7 0.013 B-1314 20.638 26.988 22.23 26.7 51.1 0.031 B-1316 20.638 26.988 25.4 30.3 60.2 0.035 B-1412 22.225 28.575 19.05 23.9 45.2 0.028 B-1416 22.225 28.575 25.4 31.6 64.8 0.038 B-1418 22.225 28.575 28.58 35.2 74.6 0.043 B-1516 23.813 30.163 25.4 32.8 69.5 0.04 B-166 25.4 31.75 9.53 11.3 18.1 0.016 B-168 25.4 31.75 12.7 16.5 29.3 0.021 B-1612 25.4 31.75 19.05 25.7 51.7 0.032 B-1616 25.4 31.75 25.4 34 74.1 0.043 B-1710 26.988 33.338 15.88 21.9 43.1 0.028 B-188 28.575 34.925 12.7 17.6 33 0.024 B-1812 28.575 34.925 19.05 27.3 58.2 0.035 B-1816 28.575 34.925 25.4 36.1 83.4 0.047 B-2010 31.75 38.1 15.88 23.9 50.7 0.032 B-2012 31.75 38.1 19.05 28.9 64.7 0.039 B-2016 31.75 38.1 25.4 38.2 92.7 0.052 B-2020 31.75 38.1 31.75 46.9 121 0.065 B-2212 34.925 41.275 19.05 30.4 71.2 0.043 B-2216 34.925 41.275 25.4 40.2 102 0.057 B-2220 34.925 41.275 31.75 49.3 133 0.071 B-2412 38.1 47.625 19.05 36.9 70.7 0.072 B-2416 38.1 47.625 25.4 49.7 104 0.096 B-2420 38.1 47.625 31.75 62 138 0.119 B-2610 41.275 50.8 15.88 30.6 57.4 0.064 B-2620 41.275 50.8 31.75 64 148 0.128 B-2816 44.45 53.975 25.4 53.3 121 0.11 B-2820 44.45 53.975 31.75 66.4 160 0.137 B-3012 47.625 57.15 19.05 41.5 88.4 0.088 B-3016 47.625 57.15 25.4 56 130 0.117 B-3216 50.8 60.325 25.4 57.5 138 0.124 B-3412 53.975 63.5 19.05 43.6 99 0.098 B-3416 53.975 63.5 25.4 59.1 147 0.131 B-3612 57.15 66.675 19.05 46 105 0.103 B-4216 66.675 76.2 25.4 66.7 182 0.159 B-4416 69.85 79.375 25.4 68.8 191 0.166 Selecting the right option Choose the size from the shaft (the needle roller complement bore diameter Fw), the housing bore (outside diameter D) and the width C. For the same bore, the BH series has a larger outside diameter, and both are inch series designs with the dimensions listed in millimetres here. Drawn cup needle roller bearings accommodate radial loads only. The maximum dynamic radial load P should be less than Cr/3, where Cr is the basic dynamic load rating, and the static load safety factor f0 (C0 divided by the maximum applied static load P0) should be greater than 3. Fitting and use The suggested mounting dimensions in the variant specification give correct running clearance for most applications, and the shaft surface should be 58 HRC or equivalent. For housings of low rigidity, reduce the housing bore as shown in the Koyo catalogue, by amounts from 0.010 mm for bores up to 9.5 mm to 0.036 mm for bores over 76.2 mm. Where the outer ring rotates relative to the load, reduce both the housing bore and the inner raceway diameter by 0.013 mm. Press the bearing into the housing with an installation tool used with a standard press. The tool must be coaxial with the housing bore, and the stamped end of the bearing (the end with the identification markings) goes against the angled shoulder of the tool. Do not hammer the bearing into place, even with a mandrel, and do not press it tightly against a shoulder. Do not inspect an unmounted drawn cup bearing by measuring its outside diameter, because the thin cup can go out of round during heat treatment and becomes round and correctly sized when pressed into a true housing or ring gage. Remove a bearing by pushing it through a straight housing, and do not reuse it after extraction. Where the shaft cannot meet the raceway hardness, case depth and surface finish requirements, use an inner ring from the Koyo IR or IRA series, which is designed as a loose transition fit on the shaft and should be clamped against a shoulder. Related products Also available from Koyo: the Koyo BH drawn cup bearing range, the Koyo HK drawn cup bearing range and the Koyo HK.2RS sealed drawn cup bearing range.
