40 Series slewing ring bearings
Double-row ball bearing with low starting torque. Low starting torque and a more forgiving mounting surface, with a stiff rectangular cross section.
- Double-row ball design
- Plain, internally geared and externally geared versions
- Raceway diameters 12–180 in; other sizes on request
- Induction hardened raceways; geared versions available with induction hardened teeth
- Matching pinions available for all standard bearings
Capacities
| Thrust | to 8,700,000 lb |
|---|---|
| Moment | to 24,000,000 ft-lb |
| Radial | to 860,000 lb |
40 Series part numbers
| SlewPro part | Series | Gear | Raceway (mm) | OD (mm) | ID (mm) | Height (mm) | Weight (lb) | Crosses to |
|---|
New 40 Series designs are added often. Don't see your size? Tell us your application and we will design it, with no engineering charge. The mounting surface must conform to defined standards for flatness and strength; contact us for help sizing this bearing.
Engineering guides
Practical articles from our engineers on specifying, installing and maintaining these parts.
Single Row vs. Double Row Ball Slewing Bearings: How to Know When to Upgrade
Learn when double row ball slewing bearings justify their cost premium over single row designs. Expert comparison of load capacity, envelope
Read the guide →When Double-Row Ball Bearings Pay for Themselves: A Lifecycle Analysis
Double-row ball slewing bearings cost more upfront — but in the right applications, they eliminate rebuilds, extend service intervals, and r
Read the guide →Why Excavator Swing Demands Double-Row Geometry
"Excavator swing bearings endure loading intensities that destroy bearings designed for less demanding duty cycles. Learn how double-row bal
Read the guide →Slewing Ring Bearing Installation and Maintenance: A Practical Checklist
How to store, mount, bolt, check and maintain a slewing ring bearing: the steps that prevent early failure, in the order you do them.
Read the guide →Talk to an engineer
Need help selecting the right part? Our engineers will size it, cross it, and quote it — usually within 1–2 business days.
Not in the catalog? We design to your application, with no engineering charge.