Ball Bearings

A ball bearing is a rolling bearing used within the power transmission industry which features metal balls between a rotating or oscillating shaft and outer ring. With applications in everything from bicycle wheels to aerospace engineering, ball bearings are designed to reduce rotational friction while supporting radial loads. Incorporating a rolling element that guarantees a low coefficient of friction, ball bearings ensure smooth and uninterrupted rotation of, for example, an axle or motor shaft.


The only way for a ball bearing to operate efficiently or at high speeds is with the right lubrication which can work at high temperatures. The correct oil or grease lubricant has to be used with each bearing depending on its nominal lifespan and load.


Types of Ball Bearings


Ball bearings are available in open and sealed versions, depending on the environmental requirements. They are also available in a range of diameters, supplied in metric sizes. Types include:



  • Deep-groove ball bearings for when higher load capacity is required

  • Angular Contact ball bearings

  • Single-row ball bearings are the most common

  • Linear ball bearings

  • Miniature ball bearings

  • Radial deep groove ball bearing

  • Self-aligning ball bearings used with long shafts

  • Thrust ball bearings

  • Ceramic bearings resistant to corrosion and very little lubrication

  • Shielded bearings

  • Double row bearings have two rows

  • Caged bearings secure the balls


Ball bearings are used in objects with moving parts and have many applications. These include quite specific uses such as in computer fans, watches, gearboxes and children's toys.


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Description Price Inside Diameter Outside Diameter Ball Bearing Type Race Width End Type Flange Outside Diameter Number of Rows Static Load Rating Material Ball Material Cage Material Race Material Race Type Dynamic Load Rating
RS Stock No. 109-961
Mfr. Part No.FT8M/1B/D
BrandBNL
HK$10.38
Each
units
8.1mm 21.7mm Thrust 3mm - - 1 40kg Plastic Carbon Steel Acetal Acetal Plain -
RS Stock No. 747-620
Mfr. Part No.DDRIF-418ZZMTHA5P24LY121
BrandNMB
HK$59.79
Each (In a Pack of 2)
units
3.17mm 6.35mm Radial 2.76mm Shielded 7.51mm 1 97N Steel Martensitic Stainless Steel Metallic Crown Steel Martensitic Stainless Steel Flanged 285N
RS Stock No. 612-5880
Mfr. Part No.DDL-1470ZZMTRA1P24LY121
BrandNMB
HK$57.50
Each (In a Pack of 2)
units
7mm 14mm Radial 5mm Shielded - 1 511N Steel Martensitic Stainless Steel Metallic Ribbon Steel Martensitic Stainless Steel Plain 1.175kN
RS Stock No. 747-658
Mfr. Part No.DDRI-614ZZHA5P24LY121
BrandNMB
HK$39.51
Each (In a Pack of 2)
units
6.35mm 9.52mm Radial 3.17mm Shielded - 1 205N Steel Martensitic Stainless Steel Metallic Crown Steel Martensitic Stainless Steel Plain 417N
RS Stock No. 540-334
Mfr. Part No.DDRF1350ZZMTRA5P24LY121
BrandNMB
HK$53.315
Each (In a Pack of 2)
units
5mm 13mm Radial 4mm Shielded 15mm 1 422N Steel Martensitic Stainless Steel Metallic Ribbon Steel Martensitic Stainless Steel Flanged 1.074kN
RS Stock No. 442-0076
Mfr. Part No.6203-2RSH
BrandSKF
HK$57.44
Each
units
17mm 40mm Deep Groove 12mm Sealed - 1 4.75kN Steel - Steel - Plain 9.95kN
RS Stock No. 764-3746
Mfr. Part No.6208ZZC3
BrandNSK
HK$149.12
Each
units
40mm 80mm Deep Groove 18mm Shielded - 1 17.9kN Steel - Pressed Steel - Plain 29.1kN
RS Stock No. 286-8066
Mfr. Part No.6207
BrandSKF
HK$99.75
Each
units
35mm 72mm Deep Groove 17mm Open - 1 15.3kN Steel - Steel - Plain 27kN
RS Stock No. 884-1216
Mfr. Part No.AC688ZZ/4N/D
BrandBNL
HK$40.12
1 Bag of 2
Bag(s)
8mm 16mm Radial 5mm Double Shielded - 1 2.5kg Plastic Stainless Steel Acetal Acetal Plain -
RS Stock No. 618-9957
Mfr. Part No.608-2RS
BrandRS PRO
HK$15.10
Each
units
8mm 22mm Miniature 7mm Sealed - 1 1.379kN Steel - - - Plain 3.293kN
RS Stock No. 109-832
Mfr. Part No.CM608/4N/D
BrandBNL
HK$59.57
Each
units
8mm 22mm Radial 7mm Open - 1 - Plastic Stainless Steel Acetal Acetal Plain -
RS Stock No. 764-3516
Mfr. Part No.6312
BrandSKF
HK$445.00
Each
units
60mm 130mm Deep Groove 31mm Open - 1 52kN Steel - Steel - Plain 85.2kN
RS Stock No. 667-1030
Mfr. Part No.608-2Z/C3
BrandSKF
HK$38.57
Each
units
8mm 22mm Deep Groove 7mm Shielded - 1 1.37kN Steel - Steel - Plain 3.45kN
RS Stock No. 884-1228
Mfr. Part No.AC608Z/4N/D
BrandBNL
HK$41.40
1 Bag of 2
Bag(s)
8mm 22mm Radial 7mm Shielded - 1 7.5kg Plastic Stainless Steel Acetal Acetal Plain -
RS Stock No. 409-0502
Mfr. Part No.6205ZZ
BrandNSK
HK$53.72
Each
units
25mm 52mm Deep Groove 15mm Shielded - 1 7.85kN Steel - Steel - Plain 14kN
RS Stock No. 612-6136
Mfr. Part No.609SSM3MTLY121
BrandNMB
HK$18.56
Each (In a Pack of 2)
units
9mm 24mm - 7mm Shielded - - 1.368kN Steel - - - Plain 3.297kN
RS Stock No. 285-0576
Mfr. Part No.61804-2RZ
BrandSKF
HK$121.16
Each
units
20mm 32mm Deep Groove 7mm Shielded - 1 2.32kN Steel - Steel - Plain 4.03kN
RS Stock No. 618-9862
Mfr. Part No.624-2RS
BrandRS PRO
HK$13.12
Each
units
4mm 13mm Miniature 5mm Sealed - 1 488N Steel - - - Plain 1.301kN
RS Stock No. 408-9883
Mfr. Part No.608ZZ
BrandNSK
HK$42.28
Each
units
8mm 22mm Deep Groove 7mm Shielded - 1 1.37kN Steel - Steel - Plain 3.3kN
RS Stock No. 505-788
Mfr. Part No.7307BEP
BrandSKF
HK$315.01
Each
units
35mm 80mm Angular Contact 21mm Open - 1 24.5kN Steel - Fibreglass Reinforced Nylon 66 - Plain 39kN