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Design Features of 121.32.3550.990.41.1502 Bearing
The design feature of a 121.32.3550.990.41.1502 is its integration of both radial and axial load-bearing capabilities, allowing it to handle complex load conditions. 121.32.3550.990.41.1502 inside diameter of inner ring is 3358mm”. Its outside diameter of outer ring is 3772.8mm”. It also combines the characteristics of both ball and roller bearings for enhanced performance in compact spaces.
What Benefits Can 121.32.3550.990.41.1502 Bearing Provide?
- Space Efficiency: They reduce the need for separate gear systems, saving space.
- Cost-Effective: By combining components, they reduce manufacturing costs.
- Improved Performance: They provide smooth, reliable rotation for applications like cranes, conveyors, and heavy machinery.
- Durability: The design allows for better load distribution, increasing the lifespan of the bearing.
- Flexibility: They work in both directions, offering more versatile use in different machinery.
What Can 121.32.3550.990.41.1502 Bearing Be Used for?
- Excavators and cranes: for smooth rotation and high load-bearing capacity.
- Wind turbines: to allow the rotor to rotate and adjust for optimal wind direction.
- Robotic arms: to provide precise movement while supporting heavy loads.
- Solar tracking systems: to follow the sun’s position for better energy efficiency.
- Turntables: in various machinery where rotation with high load-bearing is required.
| Brand | FDON |
|---|---|
| Interchangeable With | ROTHE ERDE |
| System of Measurement | Metric |
| Series | 12 |
| Gear External Gear Type | Roller Bearing |
| Bearing Type | Standard |
| Product Type | Slewing Bearing |
| Inside Diameter Of Inner Ring | 132.305" |
| Outside Diameter Of Outer Ring | 148.648" |
| Internal Diameter On Outer Ring | 138.255" |
| External Diameter On Inner Ring | 141.722" |
| Height Of Overall Bearing Assembly | 6.265" |
| Height Of Inner Ring | 5.634" |
| Height Of Outer Ring | 4.295" |
| Bolt Size | 1.064" |
| Bolt Circle In Inner Ring | 134.669" |
| Bolt Circle In Outer Ring | 143.337" |
| Size Holes In Inner Ring | 1.182" |
| Size Holes In Outer Ring | 1.182" |
| Number Holes In Inner Ring | 76 |
| Number Holes In Outer Ring | 76 |
| Pitch Diameter Of Gear | 146.253" |
| Module | 16 |
| Number Of Gear Teeth | 232 |
| Permissible Tooth Forces T | 36000lbs |
| Max Gear Tooth Load Fz | 72000lbs |
| Basic Static Load Rating(COa) | 7193920lbs |
| Moment Load Rating | 10325840ft-lbs |
| Correspond FIG | 1 |
| Tooth Width | 4.295" |
| Ring Material | 42CRMOor50MNor440C |
| Ball Material | Chrome Steel |
| Cage Material | Nylon or 300 Series Stainless Steel |
| Seal Material | NBR |
| RoHS Compliant | |
| Weight | 2028kg |
| Diameter Of Bearing Raceway | 139.87" |
| Number Of Grease Nipples | 10 |
| Distance Between Bottom Outer Ring/Inner Ring | 0.63" |
| Distance at top Outer Ring/Inner Ring | 1.97" |
Sheet 01 · Selection Guide
When Should I Choose This Structure?
Before you place an order, check whether a triple-row roller slewing bearing actually matches your equipment’s duty conditions — faster than reading any spec sheet.
- Your equipment needs continuous 360° rotation under high torque, heavy-load conditions — e.g. cranes, excavators, tunnel boring machines, wind turbine yaw systems.
- Installation space is limited, and axial load, radial load and tilting moment must be carried by a single bearing rather than a separate bearing-plus-gearbox assembly.
- The equipment needs a built-in slewing drive gear (internal or external), eliminating extra transmission components and simplifying assembly.
- The operating environment involves dust, moisture, or large temperature swings, requiring a bearing with built-in sealing and lubrication channels.
- The project has clear requirements for rotational accuracy and adjustable clearance — e.g. medical equipment, solar tracking mounts, precision turntables.
One-line summary
If your equipment needs to “rotate and carry heavy loads at the same time,” a triple-row roller slewing bearing is usually the most direct, integrated solution.
Typical equipment
Tower crane slewing platforms, crawler crane turntables, excavator upper structures, TBM cutterhead drives, wind turbine yaw/pitch systems, stacker-reclaimer slewing bodies.
Sheet 02 · When Not To Use
When Should I NOT Choose It?
We’d rather help you find the right solution than sell you the wrong one. Here’s when a slewing bearing may not be the best fit.
- If your rotational speed requirement exceeds the typical design range for slewing bearings (e.g. high-speed rotating platforms), a cross roller bearing or dedicated high-speed structure is usually a better fit.
- If overall weight is extremely sensitive for the machine (e.g. drone gimbals, small precision instruments), a thin-section or angular-contact bearing combination may be lighter and more suitable.
- If budget and production volume favor a standard bearing plus external gear assembly, that may be more cost-effective for non-heavy-duty, non-harsh-environment applications.
- If installation space is extremely constrained and cannot meet the minimum installation diameter, confirm with our engineers whether a compact custom design is available.
Not sure which case applies to you?
Send us your equipment’s duty conditions (load / speed / space / environment) and our engineers will tell you within 24 hours whether it fits — not just try to sell you something.
Free Duty Assessment →
Sheet 03 · Selection Data
Required Data For Selection
You don’t need a finished drawing to get started — tell us what you already know, and our engineers will help fill in the rest.
| Category | Data Needed | Why It Matters |
|---|---|---|
| Load Parameters | Axial load, radial load, tilting moment | Determines the number of rows and raceway design |
| Envelope Dimensions | Installation OD / ID, installation height, bolt hole pattern | Determines whether a standard size fits or custom sizing is needed |
| Speed & Duty | Operating speed (rpm), continuous or intermittent duty, environment | Affects lubrication method and seal grade |
| Drive Type | Internal-tooth / external-tooth / no gear (bearing only) | Determines gear module, tooth count and precision grade |
| Precision | Rotational accuracy, clearance range (negative clearance required?) | Affects manufacturing process and inspection standard |
| Drawing / Reference Part | Existing drawing, old bearing model, or competitor part number | Allows a direct 1:1 match or replication — the fastest path to selection |
No drawing on hand? That’s fine — send us the parameters you know, or a photo of your old bearing’s nameplate.
Send Data Now →
Sheet 05 · Material & Process
Materials / Hardness / Clearance / Gear Treatment
Every batch ships with a material certificate, hardness test report and NDT report — third-party re-inspection is welcome.
01 · MATERIAL
Ring Material
42CrMo / 50Mn (specifiable)
Determines overall strength and fatigue life. Heavy-duty applications use alloy structural steel with quenching & tempering.
02 · HARDNESS
Raceway Hardness
HRC 55–62, depth customizable
Medium-frequency induction hardening gives more uniform hardness than through-hardening, avoiding soft spots.
03 · CLEARANCE
Clearance Grade
Standard or negative, P0–P6
Heavy-duty, low-speed equipment usually uses negative clearance for higher stiffness; precision equipment can go tighter.
04 · GEAR
Gear Treatment
Q&T or induction-hardened teeth
Frequent start/stop or heavy-duty drive applications benefit from hardened tooth flanks for longer life.
Sheet 06 · Applications
Related Applications
Don’t see your industry? Applications go far beyond the examples below — tell us what your equipment does.
Cranes
Excavators & Construction
Wind Turbines
Solar Tracking
Port Machinery
Rotary Platforms
Sheet 07 · Project Reference
Real Project Case
More project photos, inspection reports and customer references are available on request — happy to sign an NDA if needed.
Case File · Port Machinery
Stacker-Reclaimer Slewing Bearing — Custom Project, SE Asia
- Background
- The customer was using an imported triple-row roller slewing bearing with a 4-month lead time and a high price point.
- Requirement
- Find a faster-to-deliver alternative while keeping the original installation dimensions and load parameters unchanged.
- Solution
- Based on the customer’s original part drawing, we replicated the key dimensions and gear geometry 1:1, and raised raceway hardness to HRC 58–62.
45 DaysLead Time
1:1Dimensional Match
2ndRepeat Order
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Frequently Asked Questions
Expert Insights and Reliable Solutions to Your Most Common Questions.
FDON GROUP supplies a full range of slewing bearings to meet different industrial needs:
- Single row four point contact slewing bearings Application: medium loads, precise rotation.
- Double row ball bearings Application: higher radial and axial loads.
- Cross roller bearings –Application: high rigidity, suitable for robots and machining centers.
- Three row roller bearings – Application: extreme loads in heavy equipment.
- Ball combine roller bearings –Application: precise rotational adjustment applications.
- Customized bearings – tailored for specific equipment requirements.
Typical selection parameter for FDON clients:
Load type: axial, radial, and tilting moment.
Rotation RPM: ensures long service life.
Installation space & mounting dimensions: inner/outer ring diameter, bolt circle.
Precision & rigidity requirements: critical for cranes, excavators, and robots.
FDON engineers provide professional selection guidance according to your equipment and drawings.
FDON GROUP selects materials for strength, wear resistance, and long-term durability:
Slewing ring: 42CrMo, 50Mn, C45N, 40CrNiMo, C48E.
Special forging spare parts: carburized/hardened steels for gear teeth (20CrMnTi, 18CrNiMo7‑6).
Corrosion resistant: SS 304, 316L, duplex stainless steel.
Surface treatments: heat treatment, quenching, carburizing, induction hardening, and surface coating(Four-Layer Packing, Strong Anti-Rust Oil, Black Oxide Treatment, Jet Black Paint Finish, Hot-Dip Galvanizing (CGL), Electro-Galvanizing (EGL), Hot-Dip Galvanizing + Paint Finish)
Correct installation with flat surfaces.
Proper lubrication using grease.
Avoid overloading or shock loads over capacity.
Monitor operating conditions regularly to prevent debris entry.
Typical factors observed by FDON engineers:
- Insufficient or incorrect lubrication.
- (dust, metal particles) in raceways.
- Rolling element or track damage.
- Uneven mounting surfaces or misalignment.
- Incorrect bolt torque(below grade 8.8) or preloading.
In-stock: 3–7 days.
Custom: 2–6 weeks depending on size, load, and precision.
Warranty: 1 year
Lifetime Free Spare Parts: Glue, seals, steel ball
Yes — FDON GROUP offers:
Detailed installation manuals.
Online engineering support.
Guidance for lubrication, maintenance, and troubleshooting solution.
Full range of materials and heat treatments for various load conditions.
High precision and strict quality inspection standards.
Engineering support before and after delivery.
Customization to exact equipment requirements.
Proven performance in cranes, excavators, robotics, wind turbines, and heavy machinery etc.
FDON MANUFACTURING CO., LTD
Leading Slew Drive & Slewing Bearing Manufacturer in China.
FDON products are applied globally in solar tracking systems, wind power systems, satellite communications, and numerous other globally connected industries.
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