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. For further information about ball bearings and how to decipher the codes on them, see our ball bearings guide.

Ball bearings that spin at high speeds require lubricant and a clean environment. Having the ball bearings shielded offers better protection against dirt and grease, therefore, the ball bearings have a longer lifespan. Sealed ball bearing offer reliability as they reduce the risk of dust and dirt entering the ball bearing mechanism. They also help to preserve the lubricant within the bearing and keep it running smoother, for longer.

Types of Ball Bearings

Ball bearings are used in machines to lessen and transform sliding friction to rolling friction and support radial and axial loads. 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. Deep Groove refers to the race (the groove where the balls rest). There is therefore a larger space between the inner and outer rings, than the diameter of the ball. This leaves space for the rubber seals.
  • 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 as well as:

  • Food and Beverage Industry
  • Pharmaceutica
  • Medical industry
  • Engines and Pumps
  • Motorsports
  • Printing

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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$15.45
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$67.44
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$60.61
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$55.06
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. 442-0076
Mfr. Part No.6203-2RSH
BrandSKF
HK$69.33
Each
units
17mm 40mm Deep Groove 12mm Sealed - 1 4.75kN Steel - Steel - Plain 9.95kN
RS Stock No. 540-334
Mfr. Part No.DDRF1350ZZMTRA5P24LY121
BrandNMB
HK$75.245
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. 764-3746
Mfr. Part No.6208ZZC3
BrandNSK
HK$179.18
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$120.43
Each
units
35mm 72mm Deep Groove 17mm Open - 1 15.3kN Steel - Steel - Plain 27kN
RS Stock No. 747-759
Mfr. Part No.DDL-950ZZHA5P24LY121
BrandNMB
HK$67.54
Each (In a Pack of 2)
units
5mm 9mm Radial 3mm Shielded - 1 207N Steel Martensitic Stainless Steel Metallic Crown Steel Martensitic Stainless Steel Plain 495N
RS Stock No. 612-5739
Mfr. Part No.DDR-830ZZRA1P25LY121
BrandNMB
HK$47.79
Each (In a Pack of 2)
units
3mm 8mm Radial 4mm Shielded - 1 176N Steel Martensitic Stainless Steel Metallic Ribbon Steel Martensitic Stainless Steel Plain 553N
RS Stock No. 409-0798
Mfr. Part No.3204BTNG
BrandNSK
HK$276.34
Each
units
20mm 47mm Angular Contact 20.6mm Open - 2 12.5kN Steel - Polyamide - Plain 19.6kN
RS Stock No. 286-8044
Mfr. Part No.6206
BrandSKF
HK$93.68
Each
units
30mm 62mm Deep Groove 16mm Open - 1 11.2kN Steel - Steel - Plain 20.3kN
RS Stock No. 667-1116
Mfr. Part No.6308-2Z/C3
BrandSKF
HK$298.01
Each
units
40mm 90mm Deep Groove 23mm Shielded - 1 24kN Steel - Steel - Plain 42.3kN
RS Stock No. 285-0576
Mfr. Part No.61804-2RZ
BrandSKF
HK$144.04
Each
units
20mm 32mm Deep Groove 7mm Shielded - 1 2.32kN Steel - Steel - Plain 4.03kN
RS Stock No. 667-1030
Mfr. Part No.608-2Z/C3
BrandSKF
HK$44.69
Each
units
8mm 22mm Deep Groove 7mm Shielded - 1 1.37kN Steel - Steel - Plain 3.45kN
RS Stock No. 286-7530
Mfr. Part No.608
BrandSKF
HK$41.90
Each
units
8mm 22mm Deep Groove 7mm Open - 1 1.37kN Steel - Steel - Plain 3.45kN
RS Stock No. 409-0502
Mfr. Part No.6205ZZ
BrandNSK
HK$74.63
Each
units
25mm 52mm Deep Groove 15mm Shielded - 1 7.85kN Steel - Steel - Plain 14kN
RS Stock No. 408-9883
Mfr. Part No.608ZZ1MC3E
BrandNSK
HK$41.43
Each
units
8mm 22mm Deep Groove 7mm Shielded - 1 1.37kN Steel - Steel - Plain 3.3kN
RS Stock No. 884-1216
Mfr. Part No.AC688ZZ/4N/D
BrandBNL
HK$51.00
1 Bag of 2
Bag(s)
8mm 16mm Radial 5mm Double Shielded - 1 2.5kg Plastic Stainless Steel Acetal Acetal Plain -
RS Stock No. 505-788
Mfr. Part No.7307BEP
BrandSKF
HK$387.71
Each
units
35mm 80mm Angular Contact 21mm Open - 1 24.5kN Steel - Fibreglass Reinforced Nylon 66 - Plain 39kN