Hangzhou Huaxing Kechuang Holding Group Co., Ltd. is one of the leading manufacturers and suppliers of angular contact ball bearings 7305bdb 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.
Bearing No. 7305BMDBP5-Angular Contact Ball Bearings
Equivalent Replacements
| Brand | Complete Set Model | Remarks |
|---|---|---|
| SKF | 2‑7305 BECBM/P5 DB | BECBM: 40° contact angle, machined brass cage; DB factory pre‑matched back‑to‑back; P5 precision class |
| FAG | 7305‑B‑MP‑DB‑P5 | MP = machined brass cage, universal DB matched set, P5 precision class |
| NSK | 7305 BWDB/P5 | W = brass cage; WDB = back‑to‑back matched set; P5 precision class |
| NTN | 7305B‑M‑DB/P5 | M: brass cage, DB matched set, P5 precision class |
| KOYO | 7305BG‑DB/P5 | G: machined brass cage, back‑to‑back DB matched set, P5 precision class |
| HXB | 7305BMDB‑P5 | M: brass machined cage, factory pre‑matched DB set, P5 precision grade; direct cross‑reference for export applications |
Technical Data
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Model No. |
7305BMDBP5 |
|
|
Ring material |
GCr15, 100Cr6, SUJ2 |
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Cage Material: |
Brass |
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|
Cage Material: |
Steel |
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Angle: |
40 |
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|
Seal: |
Non |
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Tolerance Class: |
P5, ABEC5 |
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Lubrication: |
Oil |
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Product weight: |
0,023kg |
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Brand: |
HXB or OEM |
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Package: |
Box and carton |
| Model | d(mm) | D(mm) | B(mm) | r(mm) | Cr(kN) | Cor(kN) | Grease Speed(r/min) | Oil Speed(r/min) | Weight(kg) |
|---|---|---|---|---|---|---|---|---|---|
| 7300B | 10 | 35 | 11 | 0.6 | 12.2 | 7.10 | 16500 | 24000 | 0.056 |
| 7301B | 12 | 37 | 12 | 0.6 | 13.8 | 7.85 | 15200 | 22500 | 0.068 |
| 7302B | 15 | 42 | 13 | 0.6 | 16.3 | 9.20 | 13800 | 20500 | 0.085 |
| 7303B | 17 | 47 | 14 | 1.0 | 19.8 | 11.0 | 12500 | 18500 | 0.110 |
| 7304B | 20 | 52 | 15 | 1.0 | 24.5 | 14.0 | 11000 | 16500 | 0.145 |
| 7305B | 25 | 62 | 17 | 1.1 | 31.5 | 19.2 | 9300 | 14000 | 0.225 |
| 7306B | 30 | 72 | 19 | 1.1 | 38.8 | 24.8 | 7800 | 11800 | 0.335 |
| 7307B | 35 | 80 | 21 | 1.5 | 46.2 | 29.8 | 7000 | 10300 | 0.460 |
| 7308B | 40 | 90 | 23 | 1.5 | 54.5 | 36.2 | 6200 | 9000 | 0.625 |
| 7309B | 45 | 100 | 25 | 1.5 | 63.0 | 42.8 | 5600 | 8000 | 0.810 |
| 7310B | 50 | 110 | 27 | 2.0 | 71.2 | 49.5 | 5000 | 7200 | 1.030 |
| 7311B | 55 | 120 | 29 | 2.0 | 80.0 | 56.2 | 4500 | 6500 | 1.280 |
Features
1. 40° big contact angle (B code): Far larger axial load capacity than AC(25°)/A(30°), prioritized for heavy axial + radial combined load, one-way axial thrust resistance.
2. Brass machined cage (M): High mechanical strength, heat resistance, stable at high speed & high temperature, anti-deformation, suitable for heavy load / lubrication poor working conditions vs nylon cage.
3. 73 series medium heavy load structure: Wider rolling element spacing, bigger steel ball, higher dynamic & static load rating than 72 series; strong rigidity, small elastic deformation under load.
4. Single separable structure: Inner ring + ball + cage can separate from outer ring; needs paired mounting (DB back-to-back / DF face-to-face / DT tandem) for bidirectional axial load support.
5. Material: Standard GCr15 chrome bearing steel, quenched hardened, good wear & fatigue resistance.
Why brass cage is adopted for 7300 series angular contact ball bearings?
The 7300 series is designed for heavy-load, moderate-speed industrial working conditions including reducers, air compressors and construction machinery. Brass cages are the preferred option for this bearing series mainly for the below reasons:
Brass owns outstanding mechanical strength and structural rigidity. It can resist deformation under heavy radial and axial loads as well as impact loads, avoiding cage fracture or distortion caused by large bearing dynamic force.
It runs stably at medium rotating speeds and generates little vibration & noise, effectively guiding rolling balls evenly during operation.
Brass has excellent thermal conductivity, which quickly dissipates friction heat inside the bearing and prevents excessive temperature buildup under continuous heavy-duty operation.
The material features good wear resistance and compatibility with both grease and circulating oil lubrication, adapting to diverse lubrication modes of heavy machinery.
Brass exhibits great dimensional stability and corrosion resistance, suitable for harsh working environments with moisture, slight oil contamination or temperature fluctuations.
Applications
This DB back‑to‑back matched set with 40° contact angle delivers high rigidity, strong overturning‑moment resistance and P5 rotational accuracy. The machined brass cage suits medium‑high speed continuous operation.
‑ Precision Machine Tools CNC lathe sub‑spindles, grinding wheel shafts, auxiliary shafts of machining centers, precision boring machines. Handles combined radial and bidirectional axial loads.
‑ Precision Gearboxes & Reducers Servo reducers, robot joint reducers, high‑speed gearbox output supports. Absorb thrust loads generated by gear meshing.
‑ Automation Equipment CNC rotary tables, precision indexing heads. Good for offset load and strict run‑out requirements.
‑ High‑speed Pumps & Compressors Screw pumps, process compressors. Brass cage ensures stable long‑run performance under bidirectional axial force.
‑ Textile Machinery High‑speed twisting spindles, precision winding shafts for smooth medium‑high‑speed running.
‑ Printing & Packaging Machinery High‑speed printing rollers, rotary shafts of die‑cutting machines, minimize rotational run‑out.
‑ Precision Test & Fixture Equipment Testing machine spindles, high‑speed rotary jigs.
Not suitable for: heavy shock loads, extremely low‑speed heavy‑duty conditions, pure radial‑load applications without axial thrust.
HXB Introduction
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.
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: IATF16949:2016, ISO9001:2015
We uphold rigorous craftsmanship and innovative development, committed to delivering superior bearing solutions and creating long-term value for global partners.
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.
Main Products
Precision Spindle Bearings
Angular Contact Ball Bearings
Servo Motor Bearings
Vacuum Pump Bearings
Ball Screw Support Bearings
Certificates
Exhibition
FAQ
Q1: What is the difference between 7300 series and 7200 series bearings?
Answer 7300 series belongs to the 3-series large cross-section bearings. Its load capacity is over 40% higher than 7200 series, with better shock resistance and anti-overturning performance, yet lower limiting speed. It is mainly used for heavy-duty industrial equipment, while 7200 series is applied to medium-load and high-speed scenarios.
Q2: Which contact angle is the most popular for general industrial machinery?
Answer 25° AC type is the first choice for general applications. It balances rotating speed, radial load and axial thrust, suitable for more than 90% conventional working conditions of reducers, air compressors and water pumps.
Q3: Can a single 7300 bearing bear bidirectional axial load independently?
Answer No. A single-row angular contact ball bearing can only withstand unidirectional axial force. It must be installed in pairs (DB/DF) with two or more bearings to support bidirectional axial loads.
Q4: Which precision grade should be selected for heavy-duty gearboxes?
Answer P0/P6 grades are adopted for ordinary industrial gearboxes; P5 precision grade is suitable for high-precision servo gearboxes and precision transmission structures.
Q5: What temperature range can standard 7300 steel bearings endure?
Answer Standard GCr15 bearings work stably between -40℃ and 120℃. Custom tempered high-temperature bearings are required for continuous operation above 120℃.
Advantages and Disadvantages of Brass Bearing Cages
Advantages
High tensile strength and rigidity: Resist deformation under heavy loads, shocks and alternating stress; ideal for large-size, heavy-duty bearings like 7300 series.
Superior thermal conductivity: Accelerate heat transfer out of the bearing interior, lower operating temperature and extend service life.
Smooth running performance: Low friction coefficient, stable ball guidance, low noise and vibration during rotation.
Wide lubrication adaptability: Compatible with all common lubricants (grease, mineral oil, synthetic oil).
Good corrosion resistance: Not prone to rust in humid, dusty industrial environments.
Durable under long-term continuous operation: Less prone to aging compared to plastic/resin cages.
Disadvantages
Higher cost: Brass raw material and machining cost are far higher than stamped steel cages and phenolic resin cages.
Heavier weight: Extra cage mass increases centrifugal force, so brass cages are not fit for ultra-high-speed working scenarios.
Larger inertia: Unsuitable for precision high-speed spindles that demand ultra-low dynamic inertia.
Slightly higher friction loss than polymer cages under light-load low-speed conditions.
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