71805 ACD/HCP4DBA Precision Spindle Bearings, 25° Contact Angle, High-capacity Design

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71805 ACD/HCP4DBA

Bore Diameter:25 mm

Outside Diameter:37 mm

Width:14 mm

Weight:0.038 kg

Min. Order:1 Piece

The 71805 ACD/HCP4DBA 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 71805 ACD/HCP4DBA bearing is a super-precision angular contact ball bearings with an inner diameter of 25 mm , an outer diameter of 37 mm, a width of 14 mm. It typically uses P4 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 6252 N, its static radial rated load is approximately 5991 N. open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.

Dimensions:

Inside Diameter:

25 mm

Outside Diameter:

37 mm

Thickness:

14 mm

Weight:

0.038 KG

Performance Data:

Dynamic load Capacity, Radial (Cr):

6252 N

Static load Capacity, Radial (Cor):

5991 N

Reference speed (Grease rpm):

39924

Limiting speed (Oil rpm):

62973

Specifications:

Structure:

Angular Contact

Number of Rows:

Precision Rating:

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:

718..-ACD/HCP4

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

71805 ACD/HCP4DBA bearings ( 25 mm x 37 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	71805 ACD/HCP4DBA
Bearing Type	super-precision angular contact ball bearings
Internal design	ACD = 25° contact angle, high-capacity design
Series	718..-ACD/HCP4
Weight [kg]	0.038
Units	Metric
Contact type	2-point contact
Accuracy class	P4
Rows NO.	2
Cage	Cotton fabric reinforced phenolic resin or carbon fibre reinforced PEEK, outer ring centred
Dimension series	ISO dimension series 18
Contact angle - α	25 °
Manufacturer Part Code	71805ACD/HCP4DBA
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）	20
Temperature - T(min) [°C]	-30
Temperature - T(max) [°C]	+110
Bearing set arrangement and preload	DBA = Set of two bearings arranged back-to-back < >, 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]	0.21
Dimension
d φ Inside [inch]	0.984
D Φ Outside [inch]	1.457
B Width [inch]	0.551
r₁,r₂(min.) Chamfer [inch]	0.012
r₃,r₄(min.) Chamfer [inch]	0.006
r_a(max.) Fillet [inch]	0.012
r_b(max.) Fillet [inch]	0.006
d₁ [inch]	1.146
d₂ [inch]	1.146
D₁ [inch]	1.303
Balls diameter [inch]	0.125
Performance (Load Capacity and speeds)
C_r Dynamic Radial [lbf]	1405
C_0r Static Radial [lbf]	1346
P_u Fatigue Radial [lbf]	41
Attainable speeds (Grease) [r/min]	39924
Attainable speeds (Oil-air) [r/min]	62973
Abutment dimensions
d_a(min.) [inch]	1.063
d_b(min.) [inch]	1.063
D_a(max.) [inch]	1.378
D_b(max.) [inch]	1.425
d_n [inch]	1.161

The 71805 ACD/HCP4DBA 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 71805 ACD/HCP4DBA ( 0.038 kg Mass, ID: 25 mm OD: 37 mm WD: 14 mm , 718..-ACD/HCP4 Series , 2 Rows , P4 Accuracy Class , Carbon chromium steel Material , 6252 Radial dynamic , 5991 Radial static ), Just click the button " Contact Now " to mention your purchase Requirement , Quantity and Contact Method of your requested Bearing Item No. 71805 ACD/HCP4DBA. 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.

71805 ACD/HCP4DBA Precision Spindle Bearings, 25° Contact Angle, High-capacity Design

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