Slewing Rings
Four-point contact slewing rings with gear teeth, for rotating structures under load.
Slewing rings that carry a rotating structure plus the overturning moment, often with the gear teeth cut into the ring. Mounting-hole position matters as much as the bearing itself.
8–12 weeks
1 piece
ISO 9001:2015
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Diameter range | Ø200–Ø3000 | mm |
| Type | Four-point contact | - |
| Gear teeth | Internal / external | on request |
| Mounting hole position | ±0.2 | mm |
| Sealing | Double lip, sealed races | - |
| Runout | Measured per ring | - |
Available Materials
- Bearing steel 52100 (races)
- Steel 4140 / 42CrMo (rings)
- Bronze cages
Typical Applications
- Crane and excavator slewing
- Solar tracker drives
- Wind turbine yaw
- Rotary tables
- Turntables and stages
Surface Finishes
- Black oxide
- Zinc plating
- Painted non-race faces
- Sealed races
- Pre-lubricated
Industries Served
- Energy & Oil & Gas
- Mining & Construction
- Industrial Equipment
- Agricultural Machinery
- Renewable Energy
What drives the price of this part
Derived from the callouts on this page. Where a driver is not on the drawing, it is not on this list.
- Tolerance
- Mounting hole position at ±0.2 mm is the tightest callout this family carries. Tightening a callout is a process decision, not a machining decision: below the standard ±0.005 mm the work moves to grinding or jig boring, and the price moves with it.
- Part size
- Diameter range at Ø200–Ø3000 mm decides which machine the part lands on and how many setups it needs. Size is the driver buyers most often leave out of a first enquiry, and it is the one that changes the quote fastest.
- Material
- The first material listed, Bearing Steel 52100 (100Cr6), rates 4/10 on our machinability scale at 60–66 HRC hardened · 183–217 HB annealed. On this shop's scale a harder alloy means slower passes and more tool changes, and that is cycle time the quote has to carry.
- Order size
- Minimum order is 1 piece, so on a first order setup and programming are spread over very few parts and they are most of the price. Repeat orders at the same quantity are cheaper without anything on the drawing changing.
See how cycle time is calculated in the machining time calculator and what else moves a price in the cost driver reference.
How these parts are inspected
Matched to the callouts above and the instruments actually on the floor.
- Coordinate measuring machine (Zeiss CONTURA G2, two machines, GR&R 8.4% on the critical feature)
- Dimensional report against the drawing, with a 100% check on critical features rather than a sample
- Certificate of conformance and the mill certificate with every shipment
- Bore gauges and an optical comparator for hole position and edge form
The full equipment list, with counts, is on the capability page; the inspection sequence is on quality and inspection.
Questions buyers ask
- Why do the mounting holes have to be so accurate?
- Because the ring is bolted to two structures that both have to line up. An out-of-position hole pulls the race out of round when the bolt is tightened, and the bearing then has a tight spot.
Related part families
Internal & Ring Gears
Internal gears shaped or ground in bores from 60–800 mm, for planetary and clutch drives.
Roller Bearings
Cylindrical, tapered and needle roller bearings for radial loads a ball bearing cannot carry.
Sprockets
Chain sprockets to ANSI and ISO profiles, hardened teeth and keyed or tapered bores.