ISO Certified Single-row ball slewing ring (HS series) Solutions
Finding a rotating bearing that combines compact size, load capacity, and manufacturing precision is difficult. Heng Guan Bearing Technology Co., Ltd. (Heng Guan) developed the ISO-certified Single-row ball slewing ring (HS series) line to address this difficulty. When purchasing a slewing ring for a crane, excavator, or industrial turntable, this article explains the HS series, its configuration, common uses, and the importance of supplier accreditation.
What Is a Single-row Ball Slewing Ring (HS Series) and How Does It Work?
The HS series single-row ball slewing ring has two seat rings with GCr15 chromium-steel balls, creating four-point contact with curved raceways. This geometry allows each ball to contact four points, distributing axial force through upper and lower contact angles and radial force through side contact zones. This compact slewing ring absorbs axial, radial, and overturning moment loads without additional support bearings. The rectangular cross-section and reduced internal clearance (0.02–0.08 mm axial) of the HS structure improve stiffness and limit load movement compared to older 01-series rings. The design is 40% lighter than double-row arrangements. This single-row ball slewing bearing has an adjustable ring gear (internal, external, or gearless) for rotational driving and a three-lip polyurethane seal on both sides, preventing particles as small as 10 μm. Want to know how this works in selection? The following section details things to verify before ordering.
| Design Feature | HS Series Detail | Benefit |
|---|---|---|
| Contact geometry | Four-point ball contact on curved raceway | Axial + radial + moment in one ring, no auxiliary bearing needed |
| Cross-section | Rectangular (vs 01-series) | Higher stiffness, reduced internal clearance |
| Axial clearance | 0.02–0.08 mm | Limits unwanted movement under load |
| Weight | ~40% lighter than double-row equivalent | Compact installation, reduced structural load |
| Structure variants | HSB (gearless), HSW (external gear), HSN (internal gear) | Matches any drive configuration |
| Sealing | Three-lip polyurethane, labyrinth grease channel | Blocks 10 μm particles; tolerates ±5° alignment error |
| Ball material | GCr15 chromium steel, vacuum-degassed | Uniform carbide distribution, extended raceway life |
How to Choose the Right Single-row Ball Slewing Ring (HS Series)?
Selecting the correct single-row ball slewing bearing (HS series) starts with your combined load profile — axial force (up to 5,000 kN), radial force, and tilting moment (up to 800 kN·m) — along with rotational speed and duty cycle. From there, diameter, gear configuration, and bolt pattern follow naturally. LYHGB HS catalog spans outer diameters from 400 mm to 4,860 mm with heights from 80 mm to 240 mm, gear modules from m2 to m12 at DIN 5 accuracy, and mounting holes from 18 to 72 at φ18–40 mm. Because this slewing ring uses tighter internal clearance than standard designs, mounting-surface flatness and bolt torque sequence (M12–M30, Grade 10.9 minimum, star-pattern tightening) become just as critical as the bearing choice itself.
Confirm precision grade: LYHGB manufactures across P0, P6, and P5 accuracy levels to suit different rotational demands, with raceway surface roughness held to Ra 0.8. Not sure which configuration fits your project? Send your load chart to mia@hgb-bearing.com, and our engineers will help match the right single row ball slewing bearing to your equipment quickly and accurately.
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| Technical Parameter | Specification |
|---|---|
| Outer diameter | 400 mm – 4,860 mm |
| Inner diameter | 200 mm – 4,540 mm |
| Height | 80 mm – 240 mm |
| Raceway center diameter | 625 mm – 4,540 mm |
| Ring material | 50Mn (standard) / 42CrMo (impact/shock, 28% higher low-temp toughness) |
| Ball material | GCr15 chromium steel, vacuum-degassed |
| Raceway hardness | HRC 55–62 (induction quenching) |
| Effective hardened depth | 3.5 mm |
| Gear module | m2 – m12 |
| Gear accuracy | DIN Grade 5 |
| Gear type | External (HSW) / internal (HSN) / gearless (HSB) |
| Gear tooth hardness | 55+ HRC |
| Precision grade | P0, P6, P5 |
| Axial clearance | 0.02–0.08 mm |
| Raceway surface roughness | Ra 0.8 |
| Seal type | Three-lip polyurethane; labyrinth grease channel |
| Seal particle blocking | 10 μm minimum |
| Seal alignment tolerance | ±5° |
| Cage/separator | Nylon/bronze |
| Axial load capacity | 50 – 5,000 kN |
| Overturning moment capacity | 15 – 800 kN·m |
| Operating temperature | -40 °C to +80 °C |
| Mounting bolts | M12–M30, ISO 4014, Grade 10.9 minimum |
| Mounting holes | 18–72 holes, φ18–40 mm, position tolerance ±0.05 mm |
| Design life | >15,000 hours under rated load at 5 rpm (with proper maintenance) |
| Weight (catalog range) | 100 kg – 8,760 kg per unit |
Typical Applications Across Cranes, Excavators, and Industrial Equipment
The Single-row ball slewing ring (HS series) is popular for rotating conveyors, welding manipulators, and small to medium-sized cranes and excavators because of its compact design and high combined load capacity. This adaptable slewing ring is used in aerial work platforms (20 m working height), arm-type lifts, lift-truck rotators, and industrial turntables with restricted space and stiffness requirements. Specialised configurations for radar platforms (positioning accuracy <0.01°), CT scanners (low noise, non-magnetic), machine tools, and solar-tracker mounts demonstrate the versatility of single-row ball slewing bearings to various industries.
Cold shock loading is handled by the 42CrMo ring type with significantly improved" for mining excavators. In tough coastal circumstances, the three-lip polyurethane seal inhibits sand and dust for port equipment. If your equipment runs continuously or under variable torque, discuss seal type and lubrication interval (standard: 100 hours; dusty environment: 50 hours, using NLGI Grade 2 lithium-complex grease) with your supplier before buying. These details affect service life more than most buyers expect.
| Industry | Typical Application | Load Condition | Recommended HS Variant & Feature |
|---|---|---|---|
| Construction machinery | 15-ton excavators, small/medium cranes | Heavy radial + moment, shock | 42CrMo ring, HSN internal gear, P0 |
| Industrial automation | Welding manipulators, assembly turntables | Moderate, continuous rotation | 50Mn ring, HSB gearless, P6, nylon cage |
| Aerial work equipment | 20 m platforms, arm lifts | Combined axial/radial/moment | 50Mn ring, HSW external gear, EN280 compliant |
| Material handling | Rotary conveyors (90° turn), tower cranes | Moderate cyclic load | 50Mn ring, HSW, P0, bronze cage |
| Defense & aerospace | Radar turntables | Light, precision-driven | HSB gearless, P5, <0.01° positioning |
| Port equipment | Ship-to-shore cranes, grab cranes | Heavy axial, contaminated | 42CrMo ring, HSN, three-lip PU seal |
| Mining | Mining excavators | Great shock, low-temp | 42CrMo ring (significantly improved higher toughness), HSN |
| Medical equipment | CT scanners | Low noise, non-magnetic | HSB gearless, P5, nylon cage, non-magnetic materials |
| Wind energy | Turbine main drive | Variable cyclic, long service | 42CrMo ring, HSW, P6, labyrinth seal |
Why Choose an ISO-Certified Single-row Ball Slewing Ring (HS Series) Manufacturer?
Certification isn't just paperwork — it reflects consistent raw-material control, heat treatment, and dimensional testing throughout production. Heng Guan Bearing manufactures its Single-row ball slewing ring (HS series) under ISO 9001 quality system certification, with material verification per EN 10083-3 and EN 280 safety compliance for aerial work platforms. Every bearing passes spectrometer chemical analysis, ultrasonic testing (detecting internal voids >1.5 mm), Rockwell hardness mapping (confirming 55+ HRC at 12 test points per raceway), CMM full inspection of mounting-hole positions (±0.05 mm tolerance), axial clearance measurement (0.02–0.08 mm), and finite-element analysis verifying raceway stress stays below the material yield limit. CNC vertical lathes with 5-meter maximum machining diameter, induction quenching systems with controllable 3.5 mm case depth, and gear hobbing machines at DIN 5 accuracy round out the production capability.
Choosing an ISO-certified slewing ring producer also means better traceability for warranty questions and consistent batch-to-batch performance for repeat orders. Heng Guan's flexibility with customization — including reverse engineering via on-site laser scanning to CAD modeling — means a single row ball slewing bearing can be tailored to unusual mounting patterns rather than forcing your design around a catalog part. Semi-finished stock in the 800–1,200 mm range supports rush orders in 7–15 days, versus the 12-week typical lead time from overseas suppliers.
| Quality Checkpoint | Inspection Method | Acceptance Standard |
|---|---|---|
| Raw material composition | Spectrometer analysis | 50Mn / 42CrMo per EN 10083-3 |
| Forging internal defects | Ultrasonic testing (UT) | No voids >1.5 mm |
| Raceway hardness | Rockwell indentation, 12 points per raceway | HRC 55–62 |
| Raceway hardened depth | Cross-section verification | 3.5 mm effective case |
| Gear accuracy | Gear hobbing + DIN 5 verification | DIN Grade 5 |
| Mounting-hole position | CMM full inspection | ±0.05 mm tolerance |
| Axial clearance | Dial indicator measurement | 0.02–0.08 mm |
| Raceway stress validation | Finite-element analysis (FEA) | Below material yield limit |
| Surface roughness | Profilometer | Ra 0.8 |
| Certifications | Third-party audit | ISO 9001, EN 280, EN 10083-3 |
Conclusion
The HS series delivers compact strength and dependable rotation — four-point contact load handling, 40% weight savings, HRC 55–62 raceway hardness, and >15,000-hour design life. Backed by ISO 9001 certification, EN 280 compliance, and engineering support from a 50-person team in Luoyang's bearing manufacturing hub, Heng Guan Bearing helps you source the right slewing ring with confidence.
FAQ
Q: What loads can the HS series handle at once?
A: Axial force (up to 5,000 kN), radial force, and overturning moment (up to 800 kN·m) — all simultaneously, thanks to the four-point ball contact geometry that distributes each load type through separate contact zones.
Q: How is the HS series different from the older 01 series?
A: The HS uses a rectangular cross-section with tighter axial clearance (0.02–0.08 mm) for greater rigidity, and is approximately 40% lighter than an equivalent double-row configuration.
Q: What precision grades are available?
A: Three ISO grades: P0 for general machinery, P6 for standard industrial use, and P5 for precision applications. Raceway roundness and surface roughness (Ra 0.8) are tightly controlled.
Q: What gear options come with the HS series?
A: Three variants: HSB (gearless), HSW (external gear), and HSN (internal gear). Gear module ranges from m2 to m12 at DIN Grade 5 accuracy, with tooth hardness of 55+ HRC.
Q: Is customization available for non-standard mounting?
A: Yes — Heng Guan offers flexible customization including non-standard diameters, modified mounting-hole patterns, alternative materials (50Mn or 42CrMo), nylon or bronze cages, and reverse engineering via on-site laser scanning when original drawings are unavailable.
Source Your HS Series Slewing Ring with Certified Engineering Confidence
Don't leave your rotation-critical component to chance. Heng Guan Bearing delivers ISO 9001-certified Single-row ball slewing ring (HS series) solutions in 50Mn / 42CrMo steel with GCr15 vacuum-degassed balls, HRC 55–62 induction-hardened raceways (3.5 mm case depth), DIN Grade 5 gear accuracy, three gear configurations, P0–P5 precision, and diameters from 400 mm to 4,860 mm — backed by full spectrometer, UT, CMM, and FEA inspection on every unit, EN 280 safety compliance, and 20+ years of cross-industry experience across 50+ countries. Send your drawings, load charts, or sample photos to mia@hgb-bearing.com today and receive a tailored recommendation with a quotation within 24 hours.
References
1. Harris, T. A., & Kotzalas, M. N. — Rolling Bearing Analysis, CRC Press.
2. International Organization for Standardization — ISO 76: Rolling Bearings — Static Load Ratings.
3. Brändlein, J., Eschmann, P., Hasbargen, L., & Weigand, K. — Ball and Roller Bearings: Theory, Design, and Application, Wiley.
4. Deutsches Institut für Normung — DIN 3960: Definitions, Parameters and Equations for Cylindrical Gears.
5. European Committee for Standardization — EN 280: Mobile Elevating Work Platforms — Design Calculations.
6. Zupan, S., & Prebil, I. — "Carrying Capacity of Large Rolling Element Bearings," Engineering Failure Analysis.
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