Sill Bearing
Sill Bearing
Deep groove ball bearings represent the foundation of modern rotative components, and the 6310 model is one of the most widely adapted units for heavy-duty load handling. SILL BEARING specializes in engineering this specification with high precision and reliability.
The 6310 deep groove ball bearing belongs to the 6300 medium-duty series. Engineered with balanced dimensions, it serves as an excellent option for machinery operating under intense speeds and high radial load configurations. SILL BEARING uses premium GCr15 high-carbon chromium bearing steel to produce the inner ring, outer ring, and balls, ensuring maximum fatigue life and load capabilities. Let's delve into the standardized mechanical dimensions and engineering profiles of the 6310 deep groove ball bearing:
| Standard Dimension Parameters | Value (Metric) | Engineering Significance |
|---|---|---|
| Bore Diameter (d) | 50 mm | Accepts shafts of 50mm, critical for motor and axle connections. |
| Outer Diameter (D) | 110 mm | Housing fit dimension, maintaining balanced load distribution. |
| Width (B) | 27 mm | Determines axial stability and load path space. |
| Dynamic Load Rating (Cr) | ~62.0 kN | Operational capacity under continuous rotation. |
| Static Load Rating (C0r) | ~38.0 kN | Maximum limit before permanent raceway deformation. |
| Reference Speed | ~13,000 r/min | Thermodynamic balance benchmark under nominal lubrication. |
| Limiting Speed | ~8,500 r/min (Grease) / ~10,000 r/min (Oil) | Extreme rotational speed threshold under specific lubrication systems. |
Strategically located in Hangzhou Bay New Zone, we link directly to major logistics networks while implementing multi-million dollar expansions to serve the international industrial market.
SILL BEARING FACTORY is located in the beautiful and affluent place named Hangzhou Bay New Zone, which is not only close to the two biggest ports of China—Shanghai port and Ningbo Port, but also adjacent to Hangzhou—Ningbo Expressway, 329 State Line and Hangzhou-Ningbo Railway Line. Besides, it owns the advantage of transportation, as it only takes about 90 minutes to go to Hangzhou Xiaoshan Airport or Ningbo Lishe Airport.
To expand our production capacity, our new factory Anhui TOPB IMP. & EXP. Co., Ltd. is under construction. After the new factory is put into production, our annual production capacity will increase by $20 million.
Our factories specialize in designing, studying, and producing Deep Groove Ball Bearings (￠4mm ～ ￠120mm), Tapered Roller Bearings, as well as other non-standard bearings by using superior bearing steel "GCr15". Our company not only owns the advanced automatic production equipment and the first-rate enterprise management, but also has excellent talents, strict craft, and solid technology. We demand our workers to treat the bearings like eggs which need special care and attention.
Guaranteeing a 100% acceptance rate for high-reliability industrial operations through meticulous metallurgical and geometric quality controls.
At SILL BEARING, quality is not a random result; it is the product of continuous dedication. To achieve a 100% acceptance rate, we adopt a rigorous testing cycle consisting of five unique procedures:
Every batch of GCr15 chrome steel undergoes spectroscopy, ultrasonic flaw detection, and microstructural analysis to verify hardness and find any internal structural voids or microscopic cracks before hot rolling.
Our machine operators perform continuous real-time inspections. Using digital micrometers and specialized laser gauges, they verify dimensional deviation to ensure early corrective action during the grinding phase.
A dedicated QA team inspects 100% of the finished components. They check outer/inner ring dimensions, radial and axial clearances, surface roughness, and groove roundness using advanced profilometers.
The QA Chief conducts random batch sampling. These audits verify that the vibration levels (Z1, Z2, Z3, V1, V2, V3) and rotational torque profiles meet the standards expected of the SILL brand.
Before packaging, all bearings undergo a final check. We verify anti-rust oil application, seal integrity (for 2RS/ZZ variants), product laser engraving accuracy, and structural protective packaging quality.
From domestic consumer appliances to high-demand automotive powertrains and complex agricultural systems, SILL bearings deliver performance across sectors.
Our bearings have been widely applied to fields like household appliances, micro motors, electric fans, motorcycles, automobiles, medical instruments, sports machinery, textile, and agricultural machinery. Thanks to low noise, low vibration, minimal friction, high rotational accuracy, and dependable seals, SILL bearings function reliably under challenging operating conditions.
Under continuous operation, electric motors demand low friction and quiet performance. SILL bearings provide the required Z3/V3 vibration rating and low-torque seals, minimizing power loss and temperature rise.
From alternators to transmissions, SILL bearings withstand variable loads and high temperatures. SILL provides radial durability and axial load capability for smooth driving dynamics.
Agricultural operations involve dust, water, and debris. SILL's rubber seals protect the rolling elements and hold grease, reducing maintenance and machinery downtime.
High-precision medical pumps and fitness devices require smooth rotation. The SILL brand ensures smooth movement with no abnormal noise or vibration.
Supplying industrial components to distributors and manufacturers in over 20 countries with tailormade packaging and OEM support.
Our goods sell well in the domestic Chinese market and are exported to countries and regions including the U.S., Brazil, Switzerland, United Arab Emirates, Iran, Turkey, Pakistan, Malaysia, Bangladesh, Egypt, Nigeria, Hong Kong, and Taiwan. SILL BEARING supports custom orders and OEM arrangements under our proprietary brand names: SILL and NETB.
Choosing the right rolling element design is crucial for optimizing equipment lifespan and performance. The guide below details our primary structural variations:
We support global sourcing across a wide range of deep groove ball bearing series. Review our standard offerings below:
Ultra-thin section bearings for compact, light-load applications requiring high speed and efficiency.
Thin-section configurations that minimize cross-sectional height, ideal for aerospace and robotic joints.
Medium-duty series with thick rings and larger rolling elements, designed to support heavy radial loads.
Light-duty series balancing load capacity, speed, and compact size for electric motors and appliances.
Get technical answers to common questions about sourcing 6310 ball bearings directly from Chinese manufacturers.
A standard 6310 deep groove ball bearing features an inner diameter (bore) of 50mm, an outer diameter of 110mm, and a width of 27mm. SILL BEARING manufactures these dimensions in compliance with ISO standards, utilizing GCr15 high-carbon chromium steel to provide structural durability under dynamic stresses.
GCr15 steel contains approximately 1% carbon and 1.5% chromium. This chemical composition, combined with SILL BEARING's controlled heat treatment process, yields a surface hardness of HRC 60-65. This metallurgical structure prevents fatigue flaking and extends the operational lifespan of the rolling elements and raceway.
Open bearings are designed for oil-lubricated configurations where they are housed away from debris. Metal-shielded (ZZ) versions offer non-contact protection, retaining grease at high speeds. Rubber-sealed (2RS) versions feature contact seals that protect against dust and moisture, making them suitable for dirty or outdoor operating environments.
Standard clearance (CN) is suitable for normal operating conditions. C3 clearance offers extra radial play, accommodating thermal expansion in high-temperature applications or motors. C4 clearance provides even greater radial play, designed for heavy shock loads or high-temperature industrial environments.
Our facility is close to Ningbo and Shanghai Ports, which helps reduce inland transport times and freight costs. Located near the Hangzhou-Ningbo Expressway and 329 State Line, we can transport goods to these shipping hubs within hours, ensuring reliable lead times for our customers.
Yes. We support custom orders and OEM arrangements under our proprietary brand names: SILL and NETB. We can customize the dimensions, clearances, lubricants, seals, and packaging to match your specifications.
We implement a strict five-step inspection protocol: raw material initial-inspection, operators' self-inspection, inspectors' full-inspection, chief inspectors' sampling, and final ex-factory products' inspection. This process helps us maintain low noise and low vibration levels (Z1, Z2, Z3, V1, V2, V3) on all shipped products.
Lead times depend on the order volume and customization requirements. Standard sizes can be dispatched quickly from our stock, while custom OEM production runs typically require 30 to 45 days. Contact our sales department for a detailed quote and delivery schedule.
