Product Overview
Precision-engineered bearing inner ring for demanding rotary and roller applications
The Inner Ring Segment, also referred to as Bearing Inner Ring Segment, functions as the core load-transfer component in roller bearings and roller with bearings assemblies. Installed directly on the shaft, this bearing inner ring provides a hardened and dimensionally stable raceway for rolling elements, ensuring smooth rotation and uniform load distribution.
Designed for severe industrial conditions, the segmented structure allows easy installation on large shafts where one-piece inner rings are impractical. It is widely applied in roller rotary systems, heavy roller support units, and customized inner bearings across mining, cement, and metallurgical equipment. With controlled heat treat processes and precision machining, the inner ring maintains long-term performance under high radial loads, impact forces, and continuous operation.
Heavy Load Design
Optimized geometry supports extreme radial loads in roller bearings, minimizing raceway deformation and extending service life under continuous roller rotary operation.
Segmented Flexibility
Split inner ring configuration simplifies assembly on large shafts and reduces downtime during bearing replacement or maintenance.
Thermal Stability
Controlled heat treat ensures consistent hardness and dimensional stability in fluctuating temperature environments.
Custom Compatibility
Designed for diverse bearing types and non-standard inner bearings used in specialized roller support systems.
| Inner Diameter Range | 300 – 1,800 mm |
| Segment Thickness | 60 – 180 mm |
| Hardness | ≥ 200 BHN |
| Material | ASTM A217 Gr C12 |
| Machining Accuracy | ±0.02 mm |
| Service | Custom design & drawing review |
Machining & Heat Treatment Process
The Inner Ring Segment is manufactured from ASTM A217 Gr C12 alloy steel, followed by a carefully controlled machining and heat treat sequence. Rough machining is performed first to define the segmented geometry and bearing raceway profile. The component then undergoes a dedicated heat treat process, optimized to achieve a hardness exceeding 200 BHN while maintaining internal toughness.
Post heat treatment, precision machining ensures accurate dimensions, surface finish, and roundness required for roller bearings. This process combination enhances wear resistance, load capacity, and fatigue performance, making the inner ring suitable for long-term service in high-load roller rotary and roller support applications.
Precision machining for accurate fit with roller bearings and shafts
Segmented design optimized for large-diameter inner bearings
Flexible production for custom bearing types and dimensions
Consistent quality for export-oriented industrial applications
Quality Control
Strict inspection system ensuring long-term reliability
Each Bearing Inner Ring Segment is subject to a comprehensive quality control system covering material, heat treatment, machining, and final inspection. From incoming raw material verification to final dimensional approval, every step is documented and traceable. Non-destructive testing is applied to eliminate surface and internal defects, while hardness and dimensional inspections ensure compliance with technical drawings. This strict process guarantees stable performance and consistent quality for demanding roller bearing applications worldwide.
Material Certificates – Chemical Analysis
Complete chemical composition reports are provided for each heat, ensuring full compliance with ASTM A217 Gr C12 requirements and guaranteeing material traceability throughout the entire manufacturing process.
BHN Hardness Inspection
Brinell hardness testing is conducted after heat treat to confirm a stable hardness level above 200 BHN, ensuring wear resistance and long-term performance under heavy roller bearing loads.
MPI / MT Testing
Magnetic particle and magnetic memory testing are applied to detect surface and near-surface defects, eliminating hidden cracks that could affect bearing inner ring reliability during operation.
Dimensional Inspection
All critical dimensions are inspected using calibrated measuring tools to ensure strict compliance with drawings, tolerances, and assembly requirements for roller bearings and inner bearings.
Packaging Solutions
Safe, export-ready protection for global delivery
All Inner Ring Segments are packed using fumigation-free wooden packaging, fully compliant with international export standards. Anti-rust treatment and protective separation are applied to prevent surface damage during transportation. Packaging solutions can be customized according to shipment method, destination, and customer requirements, including reinforced crates for oversized segments or multi-layer protection for long-distance sea freight. This ensures the bearing inner rings arrive at the job site in optimal condition.
Export Countries
years experience
Technical Response
Months Warranty
Export & After-Sales Service
Reliable logistics and long-term technical support
ZM INDUSTRY CO., LTD. provides professional export services for Bearing Inner Ring Segment projects worldwide. From optimized booking schedules to secure shipping arrangements, each order is managed to minimize transit risk and delivery time. After shipment, technical support remains available for installation guidance, performance feedback, and replacement planning, ensuring smooth operation throughout the product lifecycle.
Inquiry Invitation
Upgrade your roller bearing performance today
Looking for a high-precision Inner Ring Segment that performs reliably under extreme loads and continuous operation?
Contact ZM INDUSTRY CO., LTD. now to discuss your drawings, operating conditions, and customized Bearing Inner Ring solutions - engineered to exceed expectations and built for global industrial standards.
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