12-250755/1-04240

Internal toothed 12 series
  • Internal toothed 12 series
  • Internal toothed 12 series
  • Internal toothed 12 series
  • Internal toothed 12 series
  • Internal toothed 12 series

12-250755/1-04240 -Internal toothed 12 series

This series is a standardized single-row four-point contact ball slewing bearing with internal gear, designed for light to medium-duty rotary machinery applications. Featuring a compact monolithic structure, precision-machined internal gear and optimized four-point contact raceway geometry, IMO slewing bearings deliver reliable load capacity, smooth rotational performance and excellent dimensional stability, making them a versatile and cost-effective rotary solution for industrial automation, mobile equipment and general engineering machinery.



Typical Applications:

Construction machinery such as cranes and excavators

Aerial work platforms

Solar tracking systems

Radar and antenna positioning systems

Machine tools and robotics




High load-carrying capacity
Resistance to high and low temperatures
Noise-free operation
Strictly controlled tolerances and appropriate internal clearance
Long service life and low maintenance requirements
Prevention of unexpected downtime (avoiding bearing fracture, seizure, and safety incidents caused by such failures, with anti-tilting capability)

Dimension and Parameters

Internal toothed 12 series
Type :12-250755/1-04240
Brand :LYMC
Drawing No. :Drawing 3
Dimensions And Weight
Outside Dia Outer Ring
Da [mm] :855
Inside Diameter Inner ring
di [mm] :610
Inside Dia Outer Ring
Di [mm] :757
Outside Diameter Inner Ring
da [mm] :753
Weight
G [kg] :119
Mounting Holes
Pitch Arde Diameter Outer Ring
La [mm] :815
Number Of Holes Outer Ring
na :24
Pitch Arde Diameter Inner Ring
Li [mm] :694
Number Of Holes Inner Ring
ni :24
Gear
Pitch Arde Diameter
do [mm] :630
Module
m [mm] :10
Number of Teeth
Z :63
Permissible Tooth Force
Fz norm [kN] :47
Maximum Permissible Tooth Force
fzmax [kN] :86
Tooth Forces Load Ratings
Static
Corad[kN] :752
Coax[kN] :2013
Dynamic
Corad[kN] :300
Coax[kN] :349

Characteristics

✦ Internal gear on inner ring – Gear teeth cut on the inner ring for direct pinion engagement and compact drive integration.
✦ Four-point ball contact – Single-row design handles axial, radial, and tilting moment loads simultaneously.
✦ Heavy-duty capacity – Optimized internal geometry delivers high load-carrying capacity in a robust envelope.
✦ Induction-hardened raceways – Rolling surfaces hardened for wear resistance and extended service life.
✦ Double lip seals – Fitted with NBR seals on both sides to keep contaminants out and retain lubricant.
✦ Pre-drilled mounting holes – Both rings feature equispaced bolt holes for quick and secure installation.

Features

✦ Internal gear on inner ring – Gear teeth cut on the inner ring for direct pinion engagement.

✦ Four-point ball contact – Handles axial, radial, and moment loads in a single row.

✦ Heavy-duty capacity – High load-carrying capacity in a robust design.

✦ Induction-hardened raceways – Wear-resistant for extended service life.

✦ Double lip seals – Keeps contaminants out and retains lubricant.

✦ Pre-drilled mounting holes – Ready for quick bolted installation.


Further Reading