SIG771 X25 01 AA LM

SIG Series Roller bearings
  • SIG Series Roller bearings
  • SIG Series Roller bearings
  • SIG Series Roller bearings

SIG771 X25 01 AA LM-SIG Series Roller bearings

The SIG series is a premium offering within the single-row crossed roller slewing bearing family, distinguished by its advanced internal gear integration, refined manufacturing tolerances, and exceptional adaptability to dynamic operating conditions. This series has been specifically developed to address the evolving requirements of modern automation, renewable energy, and high-precision rotary equipment, where performance consistency and operational reliability are paramount.


Primary Application Domains:

High-speed packaging and labeling machinery

Semiconductor wafer handling and inspection systems

Medical robotics and surgical positioning devices

Precision optical and laser scanning equipment

Automated assembly turntables with multiple workstations

Light-to-medium duty wind turbine pitch control mechanisms



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

SIG Series Roller bearings
Type :SIG771 X25 01 AA LM
Brand :LYMC
Drawing No. :Drawing 2
Outer Dimensions
Da[mm] :771
Di[mm] :541
H[mm] :70
da f9[mm] :770
U [mm] :
C [mm] :
Outer Holes
La [mm] :736
na :#32 018
Inner Holes
Li [mm] :610
ni :#32 018
Gear Information
P [mm] :541
m :6
z :91
Fz Max[kN] :57
Weight
[KGS] :96

Characteristics

✦ Roller-race contact geometry – The single raceway is machined with a modified Gothic-arch profile, enabling two-point contact between each roller and both raceways for improved load distribution.

✦ Internal gear tooth form – Gear teeth on the inner ring feature a 25° pressure angle with tip relief, enhancing load-carrying capacity and reducing stress concentration at tooth roots.

✦ Ring cross-section design – Rings are manufactured with a tapered cross-section, providing additional material thickness at the gear root while minimizing overall weight.

✦ Heat treatment process – Rings undergo a single-shot induction hardening process, achieving a uniform hardness of 58–62 HRC across both raceways and gear teeth with a case depth of 2.5–3.5 mm.

✦ Sealing interface – Seal grooves are machined with a rectangular profile and undercut relief, ensuring secure seal retention and facilitating easy installation.

✦ Mounting hole pattern – Bolt holes are arranged in a dual-pitch pattern with alternating hole sizes, allowing compatibility with both standard and oversized fasteners.


Features

✦ Reduces stress concentration at gear roots – The 25° pressure angle with tip relief distributes meshing forces more evenly, lowering the risk of tooth breakage under peak loads.

✦ Minimizes ring distortion under load – The tapered cross-section places extra material where stress is highest, maintaining roundness and alignment.

✦ Speeds up heat treatment – The single-shot induction hardening process eliminates multiple heating cycles, reducing production time and cost.

✦ Prevents seal dislodgement – The rectangular seal groove with undercut relief mechanically locks the seal, preventing it from slipping out during operation.

✦ Simplifies fastener selection – The dual-pitch mounting hole pattern accommodates both standard and oversized bolts, reducing inventory requirements.

✦ Ensures consistent preload – The tight raceway roundness tolerance maintains uniform roller contact, ensuring stable performance across the full operating range.


Further Reading