SEG 695 X20 01 AA LM

SEG Roller External Gear
  • SEG Roller External Gear
  • SEG Roller External Gear
  • SEG Roller External Gear

SEG 695 X20 01 AA LM-SEG Roller External Gear

This single-row crossed roller external gear slewing bearing is a high-precision, high-rigidity rotary component optimized for medium-load mechanical rotation and precise positioning scenarios. Adopting a compact single-row crossed roller structure and external tooth transmission design, it abandons the traditional ball contact structure and realizes linear contact load bearing. With a streamlined overall size, excellent structural stability and reliable transmission performance, this bearing series is widely suitable for modern mechanical equipment that requires compact installation space, accurate rotation and durable cyclic operation.



Typical Applications:

Heavy-duty robotics and automation equipment

Precision rotary tables and indexing systems

Radar and antenna positioning systems

Medical equipment such as CT scanners and radiotherapy devices

High-accuracy solar tracking systems


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

SEG Roller External Gear
Type :SEG 695 X20 01 AA LM
Brand :LYMC
Drawing No. :Drawing 2
Outer Dimensions
Da[mm] :695
Di[mm] :470
H[mm] :85
U[mm] :
C[mm] :480
diH9[mm] :640
DiH9[mm] :
Outer Holes
La[mm] :
na :#36 020
Inner Holes
Li[mm] :508
ni :#36-1 020
Gear Information
P[mm] :680
m :5
z :136
Fz max[kN] :30
Weight
[KG] :82

Characteristics

✦ Single-row crossed roller arrangement – Cylindrical rollers are alternately oriented at 90° in a single raceway, maintaining line contact with both axial and radial raceways.

✦ External gear on outer ring – Gear teeth are integrally hobbed on the outer circumference with a 20° pressure angle spur profile, featuring induction-hardened flanks.

✦ Monobloc forged rings – Both rings are manufactured as single-piece forgings from 42CrMo4 steel, ensuring uninterrupted grain flow and structural integrity.

✦ Precision-ground raceways – Raceways are ground to P5 tolerance class with a surface finish of 0.4 µm Ra.

✦ Selective hardening zones – Raceways hardened to 58–62 HRC (case depth 2.0–3.0 mm), gear teeth hardened to 50–55 HRC.


Features

✦ High moment rigidity in compact axial space – The crossed roller design provides exceptional tilt resistance with a low axial height.

✦ Eliminates backlash – The alternating roller geometry removes internal clearance for precise positioning.

✦ Reduces component count – External gear allows direct pinion meshing, replacing separate gearbox components.

✦ High-speed capability – The optimized roller and raceway finish enable smooth rotation at speeds exceeding conventional designs.

✦ Protects against contamination – Integrated seal grooves allow effective sealing, extending service life in harsh environments.

✦ Simplifies assembly – The monobloc ring design requires no on-site adjustment or shimming during installation.


Further Reading