Single Row Cross Roller Slewing Bearing - 797 Series Buying Guide
Heng Guan Bearing encourages you to review this tutorial on the Single Row Cross Roller Slewing Bearing-797 Series if you're looking for a reliable rotational support option for precise equipment. Heng Guan Bearing, a reputable brand in the slewing ring bearing sector, develops and produces small, highly accurate cross roller slewing bearings for clients all over the globe. Using actual technical data from LYHGB's manufacturing line in Luoyang, China, let's examine what makes this series unique, how to properly size it, and where to get a genuine unit.
What Is a Single Row Cross Roller Slewing Bearing - 797 Series and Why Choose It?
The Single Row Cross Roller Slewing Bearing - 797 Series is made up of two seating rings that hold cylindrical rollers that are crossed over each other at right angles. With this design, a single small row can carry axial loads, rotational loads, and twisting moments all at the same time, so there's no need to put different bearings on top of each other. The 797 Series 3–4 is stiffer than a ball-type slewing ring bearing of the same diameter because the load is spread over a bigger surface area, and the rollers make line contact instead of point contact.
The support that goes all the way around 360° also stops the "hammering effect" that heavy rotational loads can cause in point-contact designs. This cross roller slewing bearing is made to handle big loads and steady spinning at low speeds. It can hold more than 200 tons in machines like bucket-wheel reclaimers. The downside is that there isn't much space inside, so installation accuracy is more important than with regular designs. When the raceway is quenched all the way through, it reaches HRC 58–64, which is the best range for wear protection and fatigue life under repetitive loading.
This makes a unit that is lighter and takes up less room than multi-row structures while still being rigid enough for heavy industry.
| Feature | 797 Series (Cross Roller) | Standard Ball Slewing Ring Bearing |
|---|---|---|
| Rolling element | Cross-arranged cylindrical rollers (1:1, 90°) | Balls |
| Contact type | Line contact | Point contact |
| Stiffness | 3–4× higher than equivalent ball type | Baseline |
| Combined load handling | Axial + radial + moment simultaneously | Good, but lower radial capacity |
| Raceway hardness | HRC 58–64 (overall quenching) | HRC 55–62 (surface induction) |
| Gear configurations | 1797 external / 2797 internal / 797 gearless | Usually single gear type per model |
| Material options | 42CrMo (default) / 50Mn (G2) / 5CrMnMo (G) | Typically single material |
| Structural variants | K/K1/K2 modified structures; Y/Y1/Y2 tech changes | Fixed catalog designs |
Key Specifications and Performance Features of 797 Series Cross Roller Bearings
Let's take a closer look at what defines the performance of the 797 Series. Diameters range from 50 mm up to 10,000 mm, with Heng Guan Bearing supporting custom bore, gear, and mounting-hole configurations on request. Three gear configurations — 1797 (external), 2797 (internal), and 797 (gearless) — cover virtually any drive layout. Materials are selectable by suffix code: 42CrMo as the default high-strength forged steel, 50Mn (G2) for cost-effective general-duty applications, and 5CrMnMo (G) for specialized impact-resistance requirements. Each roller pair sits at 90° within a single V-groove, maximizing contact area and preventing stress concentration that leads to raceway spalling.
The multi-layer heavy-duty sealing system blocks dust, water, and chemical contaminants — essential for outdoor cranes, marine environments, and metallurgical plants. Gear modules span M5 to m30 for external gears and M8 to M22 for internal gears, with tooth counts from 62 to 307, so the bearing can match nearly any existing pinion. Mounting holes range from 8 to 72 per ring, with thread sizes from M6 to M36 plus grease-fitting ports (2–36 per unit) for ongoing lubrication access. Below is a comprehensive specification overview drawn directly from LYHGB's catalog data for slewing ring bearing and cross roller slewing bearing:
| Technical Parameter | Specification |
|---|---|
| Diameter range | 50 mm – 10,000 mm (custom available) |
| External gear (1797) OD / ID / Height | 1,056–4,940 mm / 885–4,250 mm / 83–270 mm |
| Internal gear (2797) OD / ID / Height | 1,000–3,850 mm / 760–3,322 mm / 90–300 mm |
| Non-gear (797) OD / ID / Height | 550–3,310 mm / 320–2,800 mm / 85–300 mm |
| Weight range (catalog) | 85.6 kg – 8,654 kg per unit |
| Ring material | 42CrMo (default) / 50Mn (G2) / 5CrMnMo (G) — forged steel |
| Rolling element | Cylindrical rollers, 90° cross arrangement |
| Heat treatment | Overall quenching |
| Raceway hardness | HRC 58–64 |
| Precision grade | P0, P6, P5, P4 (ISO) |
| Gear type | External (1797) / internal (2797) / gearless (797) |
| Gear module (external) | m = 5, 6, 8, 10, 12, 14, 16, 18, 20, 22, 25, 30 |
| Gear module (internal) | m = 8, 10, 12, 14, 16, 20, 22 |
| Gear tooth count range | 62–307 (external); 91–164 (internal) |
| Gear tooth width | 62.5 mm – 220 mm |
| Gear modification coefficient (X) | −0.4 to +1.15 |
| Sealing system | Multi-layer heavy-duty seal (dust/water/corrosion) |
| Mounting holes | 8–72 per ring, M6–M36 + ZG1/4in / Z1/4in |
| Lubrication ports (n3) | 2–36 per unit |
| Structural variants | K / K1 / K2 (modified structure); Y / Y1 / Y2 / Y3 (tech change) |
| Friction torque option | M suffix (custom friction torque requirement) |
| Special option | U suffix (structural variant) |
| Load capacity | Supports loads exceeding 200 tons (bucket-wheel reclaimer) |
| Stiffness | 3–4× higher than equivalent ball-type slewing ring bearing |
| Compatibility | 1:1 interchangeable with international mainstream brands |
| Certifications | ISO 9001, RoHS |
| Lead time | 7–15 days (stock); 4–6 weeks (custom) |
How to Select the Right Single Row Cross Roller Slewing Bearing - 797 Series for Your Application?
Choosing the correct Single Row Cross Roller Slewing Bearing - 797 Series starts with your combined load profile — axial force, radial force, and tilting moment — along with rotational speed and duty cycle. Because this cross roller slewing bearing handles all three load directions simultaneously, it's often preferred over four-point contact designs when rigidity and low clearance matter. Next, consider your required accuracy grade (P0 through P4), ambient environment, and whether an external (1797), internal (2797), or gearless (797) configuration suits your drive motor.
Gear module and tooth count must match your existing pinion — LYHGB covers M5 to M30 externally and M8 to M22 internally. The model designation follows China's former national standard: a 7-digit base code encodes the inner diameter (ID ÷ 5 when < 500 mm, or direct fraction when ≥ 500 mm), with prefix letters (G/E/D) indicating precision class and suffix codes (G/G2 for material, K for structural variation, M for friction torque, Y for technical changes). For engineering support, reach the Heng Guan Bearing team at mia@hgb-bearing.com — including reverse engineering from physical samples when original drawings are unavailable.
| Selection Input | Why It Matters | 797 Series Range / Option |
|---|---|---|
| Combined load data (axial, radial, moment) | Determines diameter, roller size, and ring material | OD 550–4,940 mm; 42CrMo / 50Mn / 5CrMnMo |
| Gear configuration | Affects drive layout, cost, and pinion matching | 1797 (external) / 2797 (internal) / 797 (gearless) |
| Gear module & tooth count | Must match existing pinion | Ext. m5–m30 (62–307 teeth); Int. m8–m22 (91–164 teeth) |
| Precision grade | Sets rotational accuracy vs. cost trade-off | P0 (general) → P4 (precision positioning) |
| Mounting-hole pattern | Must align with equipment mounting flange | 8–72 holes, M6–M36, ZG1/4in / Z1/4in |
| Seal type | Determines service life in contaminated environments | Multi-layer heavy-duty seal (standard); custom available |
| Material selection | Balances strength, toughness, and cost | 42CrMo (default) / 50Mn (G2) / 5CrMnMo (G) |
| Structural variant | Matches non-standard installation requirements | K/K1/K2 modified; Y/Y1/Y2 tech change; U variant |
| Duty cycle & environment | Guides lubrication interval and seal choice | Grease ports 2–36 per unit; offshore surface treatment optional |
797 Series Bearing Load Capacity, Accuracy Grades, and Industrial Applications Guide
Load capacity and accuracy grade go hand in hand when evaluating a slewing ring bearing for demanding duty cycles. The Single Row Cross Roller Slewing Bearing - 797 Series covers grades from standard P0 through high-precision P4, giving buyers flexibility across heavy industrial and precision-instrument uses. The line-contact roller arrangement distributes load uniformly across the raceway, preventing stress concentration and extending fatigue life under fluctuating loads — this is why the 797 Series can support bucket-wheel reclaimer loads exceeding 200 tons while maintaining steady rotational torque.
Heng Guan Bearing tests each batch for runout, gear accuracy, and load performance using 100% CMM dimensional inspection, Rockwell hardness verification, and rotation-flexibility testing before shipment, so you can count on consistent quality every order. Typical applications span port and bulk-handling machinery, marine and offshore equipment, heavy lifting cranes, metallurgical and mining systems, and specialized industrial turntables — wherever engineers need smooth rotation without sacrificing rigidity under extreme loads.
| Industry | Typical Application | Key 797 Series Advantage | Recommended Configuration |
|---|---|---|---|
| Port & bulk handling | Bucket-wheel reclaimers, port cranes, stackers | >200-ton load capacity; line-contact fatigue resistance | 1797 external gear, 42CrMo, P0/P6 |
| Marine & offshore | Deck cranes, offshore crane slewing supports | Multi-layer seal blocks saltwater spray; corrosion-resistant surface treatment | 1797/2797, 42CrMo + special coating, P6 |
| Heavy lifting | Tower cranes, mobile cranes, heavy-duty cranes | 3–4× stiffness vs. ball type; large tilting moment capacity | 1797 external gear, 42CrMo, P0 |
| Metallurgy & mining | Ladle turret turntables, mining excavators, TBM turntables | Shock-load absorption; overall-quench HRC 58–64 | 2797 internal gear, 5CrMnMo (G), P0 |
| Industrial turntables | Rotary kilns, stacker-reclaimers, heavy rotary equipment | Continuous low-speed rotation; uniform load distribution | 797 gearless, 50Mn (G2), P0/P6 |
| Precision & specialty | Test platforms, radar mounts, custom rotary stages | P4 accuracy; K-variant structural modifications | 797 gearless, 42CrMo, P4/P5 |
Where to Buy Reliable Single Row Cross Roller Slewing Bearing - 797 Series from Certified Manufacturers?
When sourcing a Single Row Cross Roller Slewing Bearing - 797 Series, working with a certified, experienced manufacturer makes all the difference. Heng Guan Bearing is based in Luoyang, China's well-known bearing-manufacturing hub, where local expertise supports advanced CNC production and rigorous testing. A dependable supplier should offer mill certificates (EN 10204 / GB material standards), accuracy inspection reports, and sample data sheets before you commit. Look specifically for 100% CMM dimensional inspection of all critical tolerances, Rockwell hardness testing at multiple points on the raceway, gear-profile measurement, and rotation-flexibility verification — all documented per batch. ISO 9001 certification is the baseline; RoHS compliance is available for projects that require it.
LYHGB maintains semi-finished inventory for fast-response emergency replacement, and every custom order begins with a 1:1 drawing check against your equipment's mounting interface, gear parameters, and load ratings. The factory also performs reverse engineering — using laser tracking and digital measurement — when original drawings are unavailable, ensuring 1:1 interchangeability with international mainstream brands. Heng Guan Bearing welcomes inquiries for both standard catalog sizes and fully custom cross roller slewing bearing designs, backed by responsive engineering support and a team ready to guide you step by step.
| Quality Checkpoint | Inspection Method | Acceptance Standard |
|---|---|---|
| Raw-material chemistry | Spectrometer analysis | 42CrMo / 50Mn / 5CrMnMo per GB standard |
| Forging integrity | Ultrasonic testing | No internal defects > 1.5 mm |
| Raceway hardness | Rockwell testing (multiple points) | HRC 58–64 (overall quenching) |
| Gear accuracy | CMM gear-profile measurement | Precision external/internal gear per spec |
| Dimensional verification | 100% CMM inspection of all key dimensions | Within ISO P0–P4 tolerance per order |
| Rotation flexibility | Manual and powered rotation test | Smooth, no binding, no abnormal noise |
| Runout measurement | Dial indicator on mounted bearing | Within specified runout tolerance |
| Material traceability | Mill certificate + batch records | Full traceability per EN 10204 / GB |
| Certification | ISO 9001 / RoHS | Valid, current certificates on file |
Conclusion
The 797 Series Single Row Cross Roller Slewing Bearing delivers compact, high-precision rotation for demanding applications — 3–4× higher stiffness than ball-type designs, HRC 58–64 overall-quenched raceways, load capacity exceeding 200 tons, and four precision grades (P0–P4) across a 50–10,000 mm diameter range. Choose Heng Guan Bearing for certified quality engineering, flexible customization, and dedicated customer support you can trust.
FAQ
Q: What loads can the 797 Series handle simultaneously?
A: Combined axial, radial, and tilting moment loads within one compact row. The 1:1 cross-arranged cylindrical rollers make line contact with the raceway, distributing stress over a larger surface than point-contact ball designs — achieving 3–4× higher stiffness.
Q: What accuracy grades are available?
A: Four ISO grades: P0, P6, P5, and P4, covering industrial to precision-grade needs. Raceway hardness is HRC 58–64 via overall quenching across all grades.
Q: What gear configurations does the 797 Series offer?
A: Three variants: 1797 (external gear, m5–m30, 62–307 teeth), 2797 (internal gear, m8–m22, 91–164 teeth), and 797 (gearless). Gear modification coefficient ranges from −0.4 to +1.15.
Q: Can the bearing be customized?
A: Yes — custom bore sizes, gear modules, mounting-hole patterns, sealing configurations, surface treatments, and structural variants (K/K1/K2, Y/Y1/Y2, U) are all available. Reverse engineering from physical samples is supported when original drawings are unavailable.
Q: What materials are used for the 797 Series?
A: Three forged-steel options: 42CrMo (default, highest strength), 50Mn (G2 suffix, cost-effective general duty), and 5CrMnMo (G suffix, specialized impact resistance). Material is selected by suffix code in the model designation.
Q: What are the lead times for standard and custom 797 Series bearings?
A: Stock and semi-finished products ship in 7–15 days. Custom designs require 4–6 weeks depending on complexity. Semi-finished inventory supports emergency replacement needs.
Specify Your 797 Series Cross Roller Bearing with Engineering Confidence
Don't let load limitations slow your project down. Heng Guan Bearing delivers Single Row Cross Roller Slewing Bearing - 797 Series solutions in 42CrMo / 50Mn / 5CrMnMo forged steel with HRC 58–64 overall-quenched raceways, three gear configurations (1797/2797/797), four precision grades (P0–P4), gear modules from m5 to m30, and diameters from 50 mm to 10,000 mm — backed by 100% CMM inspection of all key dimensions, Rockwell hardness verification, gear-profile measurement, rotation-flexibility testing, and 1:1 interchangeability with international mainstream brands. 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. Brändlein, J., Eschmann, P., Hasbargen, L., & Weigand, K. — Ball and Roller Bearings: Theory, Design, and Application, Wiley.
3. International Organization for Standardization — ISO 76: Rolling Bearings — Static Load Ratings.
4. American Bearing Manufacturers Association — ANSI/ABMA Standards for Rolling Element Bearings.
5. Childs, P. R. N. — Mechanical Design Engineering Handbook, Butterworth-Heinemann.
6. Wang, W., & Chen, G. — "Design and Load Analysis of Slewing Bearings for Heavy Machinery," Journal of Mechanical Engineering Science.
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