Product Category

Trusted Manufacturer of Slewing Bearings & Large Machined Components

Company Telephone: +86 158 3855 3230

E-mail Address: mia@hgb-bearing.com

WhatsApp: 8615838553230

Company Location：NO9, Sanxi Road, Ximagou Industry Park, Jianxi district, Luoyang, Henan, China

Single row four point contact ball slewing bearing (Q series) manufacturer

Quality Direct Manufacturing: Single Row Four Point Contact Ball Slewing Bearing (Q series)

Navigating the global supply chain requires certainty that your partner can translate technical drawings into durable performance without compromise. Your business deserves the transparency of a direct production line to ensure every component meets rigorous engineering specifications.

When vetting a supplier for a single row four point contact ball slewing bearing (Q series), the risk of hidden trading middlemen and inconsistent metallurgical quality can stall your production. At this critical procurement stage, verifying whether a factory possesses the precise CNC machinery and NDT testing capabilities is essential to avoid premature raceway spalling or unexpected downtime. You need more than just a catalog part; you need documented proof of manufacturing integrity that guarantees long-term operational safety for your rotary equipment.

Luoyang Heng Guan Bearing Technology Co.,Ltd addresses these concerns by maintaining total control over the Gothic arch four-point contact ball structure fabrication. This single row four point contact ball slewing bearing (Q series) is a compact, lightweight, and high-precision slewing ring widely applied for light and medium-duty rotary equipment. By integrating this specific geometry, the turntable bearing can simultaneously bear axial load, radial load, and tilting moment, achieving stable rotary performance with simple installation and long service life across diverse industrial applications.

Our factory strength is anchored in strict adherence to international standards including ISO 9001, DIN, ISO, RoHS, and GB. To validate our role as a precision manufacturer, we implement rigorous ultrasonic testing (UT) and magnetic particle inspection (MT) on every single row four point contact ball slewing bearing (Q series) to detect internal voids and surface micro-cracks. With induction hardening depth precisely controlled and surface hardness exceeding 55HRC, our production capacity ensures that every batch undergoes spectrographic material analysis to confirm the chemical composition of the 50Mn or 42CrMo steel rings.

Detailed technical data sheets and factory audit reports provide a comprehensive baseline for comparing mechanical load capacities and rotational tolerances.

Related Products

Port Crane Slewing Bearing

1. Product Description: Port crane slewing bearing. This extra-large slewing bearing is designed specifically to meet the demanding load requirements under extreme operating conditions. Its core features include exceptional size, ultra-high strength, and excellent stability, making it an ideal foundational component for key equipment such as heavy-duty port machinery.
2. Product Structure: Three-row roller slewing bearing
3. Size Range: Product dimensions range from 4238mm x 270mm. Special sizes are available for custom design.
4. Materials: Base material: 42CrMo, 50Mn special alloy steel
Rolling elements: GCr15SiMn high-purity bearing steel
Seal material: Imported nitrile rubber or fluororubber
5. Applications:
Mainly used in various heavy-duty port machinery, such as port cranes, stackers and reclaimers, and container gantry cranes.

View Details

CT Machine Slewing Ring

Large Diameter Crane Slewing Bearing

CT Bearings

Internal Gear Rotary Slewing Bearing

Certified Manufacturer of High-Precision Q Series Slewing Bearings

As a premier production hub located in China’s bearing capital, Luoyang Heng Guan Bearing Technology Co., Ltd. provides the manufacturing transparency and technical rigor required to verify our standing as a top-tier supplier of Q series single row four point contact ball slewing bearings. With over 20 years of specialized expertise in the rotary component industry, we have scaled our operations to serve a global clientele across more than 50 countries, bridging the gap between high-volume production and boutique precision engineering.

Our manufacturing strength is anchored by advanced CNC groove grinding machinery, which ensures the critical Gothic arch four-point contact geometry is maintained for optimal load distribution. This technical capability allows our compact and lightweight Q series bearings to simultaneously handle axial, radial, and tilting moments with superior stability. To guarantee the structural integrity of our 50Mn and 42CrMo feedstocks, we implement a rigorous quality control protocol: 100% of our products undergo Ultrasonic Testing (UT) to detect internal inclusions and Magnetic Particle Inspection (MT) post-heat treatment to identify surface micro-cracks.

Our factory follows the strict ISO 9001 quality management system, and all of our goods are made in line with foreign standards like DIN, GB, and RoHS. This dedication to following the rules makes sure that each turntable bearing sent meets the standards for safety and reliability needed for medium-duty rotating equipment. Professionals in purchasing are welcome to check our industrial scale and technical paperwork. Get in touch with our technical sales team right away to ask for a plant audit report or a full Q series material analysis.

✅ ISO 9001 & DIN Certified

✅ 20+ Years Manufacturing Expertise

✅ 100% NDT (UT & MT) Inspection

✅ Serving Clients in 50+ Countries

✅ Verified Q Series Factory Direct

Reliable Manufacturing Excellence for Q Series Slewing Rings

Identifying a reliable OEM partner for Q series bearings involves more than just comparing technical specifications; it requires verifying raw material integrity and manufacturing precision to prevent premature operational failure. As a specialized manufacturer, the focus is on bridging the gap between technical complexity and field reliability. By integrating Gothic arch raceway precision with rigorous NDT protocols, the facility ensures every lightweight slewing ring delivers stable rotation and load-bearing performance in demanding medium-duty environments.

Certified Raw Material Integrity and Forging Excellence
Selecting the right 50Mn or 42CrMo feedstock is the foundation of bearing longevity. Every batch undergoes spectrographic analysis to confirm chemical composition and Ultrasonic Testing (UT) to detect internal voids. This rigorous material selection ensures that the Q series' lightweight design does not compromise structural strength, providing a stable foundation for simultaneous axial and radial load management in diverse rotary equipment.
View Material Standards
Precision CNC Groove Grinding for Gothic Arch Geometry
Maintaining perfect four-point contact requires extreme raceway accuracy to ensure smooth rotation under multi-directional loads. Specially designed CNC groove grinding machines achieve the exact Gothic arch geometry necessary to minimize friction and prevent the "stick-slip" phenomenon. This precision engineering allows for compact, high-precision performance, making these bearings ideal for applications requiring both space optimization and precise positioning without sacrificing life cycles.
Explore Production Technology
Rigorous Heat Treatment and Multi-Stage NDT Protocols
Surface durability is ensured through induction hardening, with mandatory verification of effective case depth and HRC hardness levels. Magnetic Particle Inspection (MT) is applied post-heat treatment to identify surface micro-cracks that could lead to raceway spalling. These comprehensive quality control layers guarantee that every slewing ring meets ISO 13012 standards, offering peace of mind through validated fatigue life and structural safety.
Check Inspection Process
Streamlined Manufacturing for Rapid Medium-Duty Deployment
Efficiency in production translates to shorter lead times for critical industrial projects. By maintaining optimized workflows for the Q series, the manufacturing process balances high-precision output with rapid delivery schedules. Whether for standard light-duty turntables or specialized medium-duty cranes, the streamlined supply chain ensures that high-quality, long-life slewing solutions reach the assembly line exactly when needed to maintain project momentum.
Download Capacity Report

100mm - 3200mm | Versatile Diameter Production Range

55+ HRC | Guaranteed Raceway Surface Hardness

100% MT & UT | Mandatory Non-Destructive Testing Coverage

15-30 Days | Rapid Lead Time for Standard Models

High-precision four-point contact geometry provides optimized load distribution for long-term rotational stability.

FAQs

1. What is your standard production lead time and minimum order quantity (MOQ) for Q series slewing bearings?

Our standard production lead time for standard Q series slewing bearings is typically 25 to 35 days, depending on the current production schedule and raw material availability. As a direct manufacturer, we offer flexible MOQ options, starting from a single unit for prototype testing to high-volume production runs for OEM partners. Our facility currently manages a monthly output of over 1,500 units, ensuring a consistent and reliable supply for light and medium-duty rotary equipment manufacturers worldwide. Each batch undergoes rigorous dimensional checks and clearance verification before shipping to ensure seamless installation. Contact our sales team today to get a detailed production schedule for your specific project needs.
2. Can you manufacture custom Single row four point contact ball slewing bearing (Q series) according to my specific application requirements?

Yes, we specialize in manufacturing customized Single row four point contact ball slewing bearing (Q series) tailored to your unique load profiles and dimensional constraints. Our engineering department can modify gear modules, mounting hole patterns, and seal types to match your equipment's specific operating environment. We utilize specialized CNC groove grinding machines to ensure the Gothic arch profile maintains optimal four-point contact, supporting diameters ranging from 100 mm up to 3,200 mm. This customization ensures that the bearing provides the necessary axial, radial, and tilting moment stability for your machinery. You can submit your technical drawings to our engineers for a free feasibility review and a formal quote within 48 hours.
3. How do you verify the material quality and raceway hardness of the bearings you produce?

We implement a multi-stage quality control process starting with spectrographic analysis of every batch of 50Mn or 42CrMo raw material to confirm chemical composition. To ensure a long service life and prevent raceway spalling, we perform induction hardening on the raceways, achieving a surface hardness of 55-62 HRC and a precise effective case depth of 3 to 4 mm. Each bearing also undergoes Non-Destructive Testing (NDT), including Ultrasonic Testing for internal voids and Magnetic Particle Inspection to detect surface micro-cracks. These protocols adhere to ISO 9001 and GB standards, guaranteeing that every unit can withstand significant tilting moments without premature failure. We provide full material and hardness testing reports with every shipment for your records.
4. Can I perform a factory audit, and what certifications do you hold to prove your manufacturing strength?

We welcome all clients to conduct on-site factory audits or arrange for third-party inspections by agencies like SGS or BV to verify our manufacturing processes and quality management systems. Our facility is fully certified under ISO 9001, DIN, and RoHS, ensuring our production lines meet international quality and environmental safety benchmarks. During an audit, you can inspect our precision machining centers, advanced heat treatment facilities, and our comprehensive testing laboratory. We maintain full traceability for every component, providing documentation packages that include material certificates and dimensional inspection reports. Please reach out to our international trade department to schedule your visit or to request our latest certification portfolio.
5. What are the essential criteria for evaluating a professional manufacturer of Single row four point contact ball slewing bearings?

A professional manufacturer should demonstrate mastery over three critical areas: heat treatment precision, grinding accuracy, and material traceability. Evaluating the supplier’s ability to achieve consistent raceway hardness (typically 55+ HRC) and their use of CNC-controlled grinding for the Gothic arch profile is vital for ensuring the Single row four point contact ball slewing bearing (Q series) maintains stability under load. Additionally, a reliable supplier must provide documented proof of compliance with international standards such as ISO, DIN, or GB. Assessing their technical support capabilities, such as their ability to perform L10 life calculations and provide interaction limit curves, is also crucial for long-term equipment reliability. Reviewing a manufacturer's testing equipment and NDT protocols is the best way to verify their actual production strength.