Product Details

With continuous innovation in materials science and manufacturing technology, open slew drives may use more advanced materials and manufacturing processes to improve their strength, wear resistance, and corrosion resistance, further improving performance.

industrial machinery
In the field of industrial machinery, open rotary drives are widely used in various equipment, such as rotating platforms, conveyor belts, cranes, etc. Its visibility and ease of maintenance make it an important transmission element in industrial production lines.

Aerospace

The lightweight design and superior heat dissipation performance make open rotary drives widely used in the aerospace field. It is used in systems such as aircraft and satellites to meet the requirements for lightweight and high efficiency.

Specification

W-21 Slew Drive,The open slew drive system is a mechanical system with an open structure, mainly used to rotate equipment or tools in the horizontal direction. Unlike closed designs, the internal mechanical components of open rotary drive systems are visible to the outside world, which provides some unique advantages in terms of operation, maintenance and teaching.

Open slew drives provide a flexible and effective option for the design and operation of drive systems through their open design, improved visibility, ease of maintenance, superior heat dissipation, lightweight design and cost-effectiveness. When dealing with different application scenarios and engineering needs, engineers and designers can choose open slew drives according to specific situations to meet performance, reliability and cost requirements.

Model	Output Torque	Tilting Moment Torque	Holding Torque	Gear Ratio	Tracking Precision	Weight	Drawing
W21	28.7 KN.m	203 KN.m	105.8 KN.m	90:1	≤0.1°	139kg
W21	21180 lbf.ft	105×10³ lbf.ft	78.1×10³ lbf.ft	90:1	≤0.1°	139kg

Frequently Asked Questions

Expert Insights and Reliable Solutions to Your Most Common Questions.

1. What types of slewing bearings does ZZ Slewing Bearing provide?

ZZ Slewing Bearing 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.

2. How do I choose the right bearing for my application?

Typical selection parameter for ZZ 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.

ZZ engineers provide professional selection guidance according to your equipment and drawings.

3. What materials does ZZ Slewing Bearing use for slewing bearings?

ZZ Slewing Bearing 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)

4. How can ZZ Slewing Bearing achieve maximum service life?

Correct installation with flat surfaces.

Proper lubrication using grease.

Avoid overloading or shock loads over capacity.

Monitor operating conditions regularly to prevent debris entry.

5. What causes abnormal noise or vibration in bearings?

Typical factors observed by ZZ 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.

6. What are lead times and lifetime guarantee?

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

7. Does ZZ provide installation and technical support?

Yes — ZZ Slewing Bearing offers:

Detailed installation manuals.

Online engineering support.

Guidance for lubrication, maintenance, and troubleshooting solution.

8. How do ZZ Slewing Bearing differ from competitors?

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.

ZZ Slewing Bearing (Shanghai) Co., Ltd

Leading Slew Drive & Slewing Bearing Manufacturer in China.

ZZ products are applied globally in solar tracking systems, wind power systems, satellite communications, and numerous other globally connected industries.