Hangzhou Huaxing Kechuang Holding Group Co., Ltd. is one of the leading manufacturers and suppliers of angular contact ball bearings 7005ctap4 in China. As we have world-leading production equipment and strong manufacturing capabilities, we warmly welcome you to buy bulk high quality bearings at competitive price from our factory.
Angular Contact Ball Bearings-7005CTAP4
Specifications
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Bearing No. |
7005CTAP4 |
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Dimension |
25*47*12mm |
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Lubrication |
Oil or grease |
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Weight |
0.076kg |
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- 100% phenolic resin cage for higher resistance and durability. |
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- Supports 12000 rpm with grease, 17000 rpm with oil. |
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- Our high-quality bearing is made to reduce your replacement frequency and maintenance cost. |
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- Single-row, pre-lubricated, normal accuracy. |
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- Single row angular contact ball bearings are designed to accommodate loads in one direction only. |
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- This type of bearing is typically adjusted against a second bearing. |
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- Their bearing rings have an upper and a lower shoulder and are non-separable. |
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- Chromium Steel (GCr15) made with heat treating, provides high and uniform hardness, good wear resistance. |
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Angular contact ball bearings (whether standard precision 7005C or P4 precision grade) can theoretically be installed and operated as a single unit, yet their applicable working conditions are restricted. Single mounting is not recommended for most load-bearing scenarios.
The 7005CTAP4 is an ultra-precision P4-grade angular contact ball bearing designed specifically for high-speed spindles, originally engineered to be used in paired arrangements. If utilized individually as an economical general-purpose angular contact bearing, its superior precision performance will be largely wasted, and inherent structural drawbacks will occur.
Features
A contact angle exists between the rolling elements and inner/outer rings of angular contact ball bearings (the contact angle of 7005C is 15°), meaning the bearing can only bear axial force in one direction under load: When subjected to radial load, an induced axial force (internal axial component force) is generated automatically.
When a single bearing runs alone: there is no counterforce to offset the internal axial force, leading to continuous axial shifting of the shaft assembly and uncontrollable axial clearance. This results in excessive rotational runout, accelerated wear, increased operating noise, and high risk of thermal seizure at high speeds.
Scenario 1: Single Bearing Installation (Only Extremely Simple Working Conditions Permitted)
✅ Strict prerequisites for acceptable single use:
Load is predominantly pure radial load with nearly no axial thrust;
Extremely low rotational speed, intermittent operation, and very low precision requirements;
Auxiliary components mounted on the opposite shaft end (deep groove ball bearings, thrust washers, sleeves) to counteract the induced axial force produced by this bearing.
Applicable niche applications: Simple conveying rollers, low-speed light-duty idle rollers, small hand-operated machinery, non-precision transmission idlers.
❌ Single mounting of precision 7005C P4 bearings is strongly discouraged: This bearing is developed for precision rotation and high-speed operation (machine tool spindles, engraving machine spindles, high-speed grinding heads), featuring low runout, high rigidity and stable temperature rise. Axial shifting cannot be restrained with a single bearing; its P4 ultra-precision performance cannot be realized at all, and the bearing will fail directly under high-speed working conditions.
Scenario 2: Standard Paired Installation (Designated Usage for This Bearing)
Standard pairing layouts for angular contact bearings eliminate bidirectional axial forces and lock axial clearance:
Back-to-Back (DB) Arrangement: Optimal rigidity, powerful resistance to overturning moment; most widely adopted for machine tool spindles.
Face-to-Face (DF) Arrangement: Slightly better self-aligning performance, commonly used for lengthy shafts.
Tandem (DT) Arrangement: For bearing extremely large unidirectional axial loads.
Combinations of 2, 3 or 4 bearings can be pre-mounted with preload to suit high-speed precision spindles.
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Differences Between General Angular Contact Bearings and 7005C TA P4
| Comparison Item | Economical General 7005 Angular Contact Bearing (P0/P6 Standard Precision) | 7005C TA P4 Precision High-Speed Bearing |
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| Positioning | Transmission for general machinery, low-speed reducers, fans | CNC spindles, high-speed grinding equipment, precision rotary tooling fixtures |
| Maximum Rotational Speed | Relatively low, no strict temperature rise limits | Extremely high DN value, suitable for operation up to tens of thousands of revolutions per minute |
| Precision | Ordinary rotational precision, large runout tolerances | P4 ultra-precision grade, minimal radial and axial runout |
| Cage Type | Mostly stamped steel cages | TA: Solid phenolic resin cage, wear-resistant, low friction, tailored for high-speed operation |
| Preload Compatibility | Preload assembly rarely applied | Fine light/medium preload available to enhance rigidity |
| Suitability for Single Use | Acceptable occasionally under low speed & light load | Strictly prohibited for high-speed precision applications |
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Summary & Recommendations
If applied to ordinary mechanical structures with low speed, light radial load and zero axial force: Single installation is allowable, but axial limiting structures must be fitted on the opposite shaft end to offset internal axial force.
For applications requiring continuous operation, relatively high rotational speed, rotational precision or slight axial load: Two or more bearings must be used in paired configuration.
As a precision spindle bearing, the optimal application mode for 7005CTAP4 is always paired installation with preloading.
Applications
Applications of 7005CTAP4 Bearings
CNC machine tool main spindles
Engraving machine & PCB high-speed spindles
Precision grinding machines & high-speed grinding heads
Optical instruments, precision rotary tables
Automated equipment rotary fixtures
Dental high-speed handpieces
Robot small joints & miniature high-speed rotary units
HXB Introduction
HXB established in 1995, as a leading ball bearing manufacturer in China, HXB offers more than 1,000 kinds of ball bearing to fulfill our customers' needs. With excellent production team and technical team, we can supply high quality products consistently.
After more than 20 years of development, HXB's main products involves deep groove ball bearings, angular contact ball bearings, high precision spindle bearings, etc. Our bearings are wildly used in electric motors, machinery tool spindle, CNC, NEVs and other fields.
Our production capacity:
- Deep groove ball bearings: 34 production lines, 30,000,000pcs per year
- Angular contact ball bearings: 14 production lines, 3,000,000pcs per year
Application fields: electric motors, pumps, textile machine, household appliance, machine tool spindle, CNC machine, healthcare industry, intelligence manufacturing etc.
Certificate: TS16949:2016, ISO9001:2015
Advantages
HXB was founded in 1995, with nearly 30 years of dedicated development, HXB now operates6 subsidiaries.
∗ 2 high-tech R&D centers
∗ 2 modern manufacturing factories - Hangzhou Yijia Precision Bearing Co., Ltd. and Zhejiang Ruiyang Bearing Technology Co., Ltd.
∗ Supported by advanced digital MES and SPC management systems
∗ IATF16949:2016, ISO9001:2015 and ISO14001 certifications
∗ High-end equipment and high-quality material
About HXB
1. Hangzhou Factory - YJB
Founded in June 2007, YJB is located in Hangzhou. As a subsidiary of HXB Group, we are a national high-tech enterprise and provincial science & technology enterprise specializing in R&D and manufacturing of high-precision, high-speed, advanced, special and professional bearings.
Core Capabilities & Intelligent Manufacturing
- Product Size: Inner diameter Φ3–Φ300mm
- Precision Classes: P2, P4 (ultra-precision grades)
- Annual Capacity: 3 million sets of precision bearings in a lean & intelligent factory
- Equipment Investment: Over RMB 3 million in world-leading precision testing instruments
- Digital Transformation: with full deployment of MESYS bearing design platform, ERP, MES, WMS, SPC real-time quality monitoring and OA systems, building a benchmark smart manufacturing plant.
Main Products
Precision Spindle Bearings
Angular Contact Ball Bearings
Servo Motor Bearings
Vacuum Pump Bearings
Ball Screw Support Bearings
2. Huzhou Factory
In 2021, the deep groove ball bearing factory relocated from Hangzhou to Huzhou. It operate in a 10,000㎡ production facility with a team of 75 employees, focused on the R&D, and manufacturing of high-performance deep groove ball bearings.
We maintain a professional engineering and quality system to ensure stable precision and reliability.
Engineering Team: 4 bearing design & process engineers, accounting for 5% of staff.
Quality Team: 15 quality personnel, including 2 quality engineers, 20% of staff, covering incoming inspection, in-process control and final testing.
Product Range
Series: 6000–6024, 6200–6214, 6300–6314, 6800–6824, 6900–6924
Features: High rigidity, low noise; suitable for grease lubrication or oil-mist lubrication.
6 Series X4YA-2RS (Double-lip seal) & APT Retainer Series
Features: High & low temperature resistance, superior sealing, high load capacity, long service life.
Application: New energy vehicle transmission systems.
Certificates
Exhibition
FAQ
Q1: What are the disadvantages of using a single 7005C (15° contact angle) bearing alone?
Using a single 7005C TA P4 bearing without a paired counterpart brings four major technical drawbacks:
1. Unrestrained axial endplay (core problem) Radial load produces an inherent induced axial force inside the angular contact bearing. A single bearing has no reverse restraining force, causing continuous shaft axial shifting. This leads to drastically increased radial and axial runout, completely wasting the P4 ultra-precision tolerance. Long-term operation causes expanding bearing clearance and obvious noise, and load fluctuation will further amplify endplay.
2. Accelerated wear due to uneven load distribution Load only acts on one side of rolling elements and raceways, causing local stress concentration. Premature pitting and fatigue spalling occur on raceway surfaces, greatly shortening service life. At high speeds, concentrated friction heat causes overheating, leading to rapid deterioration and drying of lubricating grease. 3. Preloading is not achievable Precision angular contact bearings rely on paired mounting and preloading to enhance rigidity and reduce runout. Single bearing installation cannot apply preload, so the high-rigidity design advantage of P4 precision bearings is fully lost.
Q2: Is single mounting of 7005CTAP4 allowed? What are the mandatory assembly conditions?
1. Required shaft support layout - One end: Single 7005CTAP4 angular contact ball bearing - The other end: Deep groove ball bearing (6205 / 6005) - Matching limiting parts: Shaft shoulders, spacer sleeves, circlips, end cover locking assemblies
2. Working principle The deep groove ball bearing allows slight axial sliding to absorb the internal induced axial force of the angular contact bearing and restrain shaft axial shifting.
3. Strict application limits Speed ≤ 1500 rpm, intermittent operation, pure light radial load, no reciprocating axial thrust, and only general precision requirements.
Q3: What are the standard paired mounting methods for 7005CTAP4? Their advantages and applicable scenarios?
1. Back-to-Back (DB) Arrangement (Most Recommended) Features: Wider support span, excellent anti-overturning performance, maximum shaft rigidity, and minor axial clearance variation during thermal expansion with outstanding high-speed stability. Applicable scenarios: Engraving machine spindles, grinding machine spindles, CNC milling machine spindles.
2. Face-to-Face (DF) Arrangement Features: Good self-aligning performance, high tolerance for shaft coaxial errors; relatively lower rigidity, not suitable for ultra-high speed operation. Applicable scenarios: Long transmission shafts, precision fixture rotary seats.
Q4: What critical assembly details must be followed for 7005CTAP4 precision bearings?
1. General low-speed ordinary machinery Economical P0/P6 grade 7005C is sufficient with better cost performance. Occasional single mounting is acceptable with negligible wear loss.
2. Precision preload control P4-grade paired bearings require ground spacer rings for accurate preloading: light preload for high-speed priority, medium preload for rigidity priority.
3. Temporary simple fixtures & intermittent low-speed trial operation Single 7005CTAP4 bearing matched with a deep groove ball bearing at the opposite end is feasible.
4. Professional lubrication Special high-speed spindle grease is mandatory for high-speed operation; ordinary lithium grease is prohibited.
Q4: What critical assembly details must be followed for 7005CTAP4 precision bearings?
1. Cage protection The TA phenolic resin solid cage is brittle. Never strike the cage during installation; mounting force can only act on the end faces of inner and outer rings.
2. Precision preload control P4-grade paired bearings require ground spacer rings for accurate preloading: light preload for high-speed priority, medium preload for rigidity priority.
3. Clean assembly environment Assembly must be completed in a dust-free environment. Tiny dust particles will scratch the precision raceway and damage bearing accuracy.
4. Professional lubrication Special high-speed spindle grease is mandatory for high-speed operation; ordinary lithium grease is prohibited.
Q5: How to select correctly between general 7005 bearings and 7005CTAP4?
1. General low-speed ordinary machinery Economical P0/P6 grade 7005C is sufficient with better cost performance. Occasional single mounting is acceptable with negligible wear loss.
2. Precision continuous high-speed equipment Must use 7005C TA P4 bearing with DB paired mounting and preloading to ensure high precision, high rigidity and stable high-speed operation.
3. Temporary simple fixtures & intermittent low-speed trial operation Single 7005CTAP4 bearing matched with a deep groove ball bearing at the opposite end is feasible.
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