7228CD/HCP4A Super-precision Ball Bearings, 15° Contact Angle, High-capacity Design

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7228CD/HCP4A

Bore Diameter:140 mm

Outside Diameter:250 mm

Width:42 mm

Weight:6.9 kg

Min. Order:1 Piece

The 7228CD/HCP4A Ultra-precision angular contact ceramic ball bearings are widely used in high-speed, high-precision applications and situations where there is a risk of shaft current, such as: high-speed machining center spindles, high-speed electric spindles, grinding machine spindles, lathe spindles, ball screw support mechanisms, and medical equipment (high-speed dental drills).

The 7228CD/HCP4A bearing is a super-precision angular contact ball bearings with an inner diameter of 140 mm , an outer diameter of 250 mm, a width of 42 mm. It typically uses P4A grade precision tolerances and Carbon chromium steel rings, HC = Balls made of bearing grade silicon nitride Si3N4 (hybrid bearing) rolling mlement. Its dynamic radial rated load is approximately 220856 N, its static radial rated load is approximately 239889 N. open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.

Dimensions:

Inside Diameter:

140 mm

Outside Diameter:

250 mm

Thickness:

42 mm

Weight:

6.9 KG

Performance Data:

Dynamic load Capacity, Radial (Cr):

220856 N

Static load Capacity, Radial (Cor):

239889 N

Reference speed (Grease rpm):

6968

Limiting speed (Oil rpm):

9944

Specifications:

Structure:

Angular Contact

Number of Rows:

Precision Rating:

P4A

Bearing Material:

Carbon chromium steel

Cage Type:

Cotton fabric reinforced phenolic resin or carbon fibre reinforced PEEK, outer ring centred

Seals Type:

open

Rolling Mlement Material:

HC = Balls made of bearing grade silicon nitride Si3N4 (hybrid bearing)

Bore Type:

Z = Cylindrical Bore

Operating Temperature:

-30 to +110 °C

System of Measurement:

Metric

Series:

72..-CD/HCP4A

Rolling Element:

balls

Transaction Information:

Transport Package:

Standard Export Package

Service:

7*24 hour

Shipping Ways:

by Sea or Air

Country of Origin:

china

Stock:

100 Piece

Port:

Tianjin, Shanghai, Shenzhen, Guangzhou or Qingdao

Payment term:

by T/T in advance

Delivery time:

2-3 days for stock, 25-30 days for bulk production

Detailed description

7228CD/HCP4A bearings ( 140 mm x 250 mm x 42 mm) have the advantages of ceramic balls materials, high speed, ultra-high precision and high thermal stability, corrosion resistant, non-magnetic, and are therefore widely used in the Machine tool spindles, high-speed electric spindles, precision instruments, aerospace and semiconductor equipment.

Part Number	7228CD/HCP4A
Bearing Type	super-precision angular contact ball bearings
Internal design	CD = 15° contact angle, high-capacity design
Series	72..-CD/HCP4A
Weight [kg]	6.9
Units	Metric
Contact type	2-point contact
Accuracy class	P4A
Rows NO.	1
Cage	Cotton fabric reinforced phenolic resin or carbon fibre reinforced PEEK, outer ring centred
Dimension series	ISO dimension series 02
Contact angle - α	15 °
Manufacturer Part Code	7228 CD/HCP4A
Bore Type	Z = Cylindrical Bore
Ring material	Carbon chromium steel
Ball material	HC = Balls made of bearing grade silicon nitride Si3N4 (hybrid bearing)
Temperature - T(min) [°C]	-30
Temperature - T(max) [°C]	+110
Single bearing - execution and preload	Single standalone bearing
Ring type	inner rings(1 piece), outer rings(1 piece)
Load Direction	Angular Contact
Seal type	open
Grease quantity - G_ref [cm³]	84
f₀ Calculation coefficient	15.2
Dimension
d φ Inside [inch]	5.512
D Φ Outside [inch]	9.843
B Width [inch]	1.654
r₁,r₂(min.) Chamfer [inch]	0.118
r₃,r₄(min.) Chamfer [inch]	0.059
r_a(max.) Fillet [inch]	0.098
r_b(max.) Fillet [inch]	0.059
d₁ [inch]	6.965
d₂ [inch]	6.965
D₁ [inch]	8.394
Performance (Load Capacity and speeds)
C_r Dynamic Radial [lbf]	49648
C_0r Static Radial [lbf]	53927
P_u Fatigue Radial [lbf]	1646
Attainable speeds (Grease) [r/min]	6968
Attainable speeds (Oil-air) [r/min]	9944
Abutment dimensions
d_a(min.) [inch]	6.063
d_b(min.) [inch]	6.063
D_a(max.) [inch]	9.291
D_b(max.) [inch]	9.488
d_n [inch]	7.276

The 7228CD/HCP4A Ultra-precision angular contact ceramic ball bearings are primarily composed of high-precision bearing steel inner and outer rings, silicon nitride ceramic balls, and a cage. The cage is available in ball-guided polyamide (silent series) or brass. Contact angles are available in various specifications, including 15°, 25°, and 40°, with precision grades reaching P4 and above.

Ultra-precision angular contact ceramic ball bearings feature low-density ceramic balls, resulting in low centrifugal force, significantly improved limiting speed, and lower heat generation. The electrical insulation properties of the ceramic material effectively prevent electrolytic corrosion, extending bearing life. The silent series uses ball-guided polyamide cages to reduce vibration and noise, and optimized tolerances ensure more uniform load distribution and superior radial stiffness in bearing groups.

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High quality 7228CD/HCP4A ( 6.9 kg Mass, ID: 140 mm OD: 250 mm WD: 42 mm , 72..-CD/HCP4A Series , 1 Rows , P4A Accuracy Class , Carbon chromium steel Material , 220856 Radial dynamic , 239889 Radial static ), Just click the button " Contact Now " to mention your purchase Requirement , Quantity and Contact Method of your requested Bearing Item No. 7228CD/HCP4A. then click the button " Send " The web site will make your purchasing information sent to the supplier's mailbox, who will come to contact you upon they get your information at the first time.

7228CD/HCP4A Super-precision Ball Bearings, 15° Contact Angle, High-capacity Design

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