708 CD/HCP4ADGA Super-precision Ball Bearings, 15° Contact Angle, High-capacity Design

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708 CD/HCP4ADGA

Bore Diameter:8 mm

Outside Diameter:22 mm

Width:14 mm

Weight:0.022 kg

Min. Order:1 Piece

The 708 CD/HCP4ADGA 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 708 CD/HCP4ADGA bearing is a super-precision angular contact ball bearings with an inner diameter of 8 mm , an outer diameter of 22 mm, a width of 14 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 5170 N, its static radial rated load is approximately 2650 N. open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.

Dimensions:

Inside Diameter:

8 mm

Outside Diameter:

22 mm

Thickness:

14 mm

Weight:

0.022 KG

Performance Data:

Dynamic load Capacity, Radial (Cr):

5170 N

Static load Capacity, Radial (Cor):

2650 N

Reference speed (Grease rpm):

109933

Limiting speed (Oil rpm):

159886

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

Number of Balls:

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:

70..-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

708 CD/HCP4ADGA bearings ( 8 mm x 22 mm x 14 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	708 CD/HCP4ADGA
Bearing Type	super-precision angular contact ball bearings
Internal design	CD = 15° contact angle, high-capacity design
Series	70..-CD/HCP4A
Weight [kg]	0.022
Units	Metric
Contact type	2-point contact
Accuracy class	P4A
Rows NO.	2
Cage	Cotton fabric reinforced phenolic resin or carbon fibre reinforced PEEK, outer ring centred
Dimension series	ISO dimension series 10
Contact angle - α	15 °
Manufacturer Part Code	708CD/HCP4ADGA
Bore Type	Z = Cylindrical Bore
Ring material	Carbon chromium steel
Ball material	HC = Balls made of bearing grade silicon nitride Si3N4 (hybrid bearing)
Balls qty（single row）	9
Temperature - T(min) [°C]	-30
Temperature - T(max) [°C]	+110
Bearing set arrangement and preload	DGA = Set of two bearings for universal matching, Extra light preload
Ring type	inner rings(1 piece), outer rings(1 piece)
Load Direction	Angular Contact
Seal type	open
Grease quantity - G_ref [cm³]	0.15
f₀ Calculation coefficient	8.4
Dimension
d φ Inside [inch]	0.315
D Φ Outside [inch]	0.866
B Width [inch]	0.551
r₁,r₂(min.) Chamfer [inch]	0.012
r₃,r₄(min.) Chamfer [inch]	0.008
r_a(max.) Fillet [inch]	0.012
r_b(max.) Fillet [inch]	0.008
d₁ [inch]	0.496
d₂ [inch]	0.496
D₁ [inch]	0.685
Balls diameter [inch]	0.156
Performance (Load Capacity and speeds)
C_r Dynamic Radial [lbf]	1162
C_0r Static Radial [lbf]	595
P_u Fatigue Radial [lbf]	18
Attainable speeds (Grease) [r/min]	109933
Attainable speeds (Oil-air) [r/min]	159886
Abutment dimensions
d_a(min.) [inch]	0.394
d_b(min.) [inch]	0.394
D_a(max.) [inch]	0.787
D_b(max.) [inch]	0.811
d_n [inch]	0.535

The 708 CD/HCP4ADGA 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 708 CD/HCP4ADGA ( 0.022 kg Mass, ID: 8 mm OD: 22 mm WD: 14 mm , 70..-CD/HCP4A Series , 2 Rows , P4A Accuracy Class , Carbon chromium steel Material , 5170 Radial dynamic , 2650 Radial static ), Just click the button " Contact Now " to mention your purchase Requirement , Quantity and Contact Method of your requested Bearing Item No. 708 CD/HCP4ADGA. 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.

708 CD/HCP4ADGA Super-precision Ball Bearings, 15° Contact Angle, High-capacity Design

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