Premium Bottom and Top Rollers China Factory Leading Undercarriage Parts Suppliers
Our premium Bottom Rollers and Top Rollers are engineered to meet rigorous OEM standards, providing unmatched stability and durability for heavy-duty construction and mining machinery. Designed to withstand the most punishing environments, these undercarriage components ensure your equipment maintains peak operational efficiency even on the most uneven and abrasive terrains.
By utilizing high-grade forged special steel and precision heat treatment, we deliver a product that minimizes downtime and maximizes service life. Whether you are operating in deep quarries or rugged construction sites, our rollers provide the structural integrity and sealing performance required to protect your investment from dirt, sand, and water infiltration.
Detailed Parameters
| Manufacturing Standard | OEM Standard Compliance | Main Pin Shaft Material | High-Strength Round Steel |
|---|---|---|---|
| Shell Material | Forged Special Steel | Hardening Depth | 6mm Deep Heat Treatment |
| Surface Hardness | Approx. HRC 56° | Seal Type | Alloy Chrome & Molybdenum Floating Seal |
| Sealing Components | Elastic Rubber O-Rings | Bushings | High-Quality Bimetal Bronze |
| Quality Testing | Underwater Sealing & Rolling Fluency Test | Compatible Brands | Komatsu, Caterpillar, Hitachi, Volvo, etc. |
Key Advantages
Extreme Durability
Forged shells and round steel shafts hardened to HRC 56° ensure maximum resistance to wear and impact.
Extended Service Life
Deep 6mm heat treatment prevents surface deformation and significantly reduces replacement frequency.
Advanced Sealing
Chrome & molybdenum floating seals prevent contaminants from entering the internal lubrication system.
Precision Engineering
Bimetal bronze bushings provide smooth rotation and reduced friction for better energy efficiency.
Rigorous Testing
Every unit undergoes underwater leak testing and rolling fluency checks before shipping.
Universal Fitment
Perfectly compatible with major brands like Komatsu, CAT, Hitachi, Volvo, Kobelco, and Sumitomo.
Product Gallery
Management Platforms
Material Control
Strict sourcing of special forged steel and round steel to ensure foundational strength.
Thermal Processing
Controlled heat treatment cycles to achieve a precise 6mm hardening depth.
Sealing Audit
Comprehensive underwater testing to verify 100% seal integrity against leaks.
Motion Analysis
Rolling fluency testing to guarantee seamless operation without vibration.
Compatibility Matrix
Engineering checks to ensure perfect fitment for diverse excavator models.
Finishing Process
Anti-corrosive painting and secure industrial packaging for global shipping.
Investment Return Comparison
| Feature | Standard Rollers | Crafts Premium Rollers |
|---|---|---|
| Hardening Depth | 2-3 mm | 6 mm Deep Hardened |
| Seal Material | Standard Rubber | Chrome-Molybdenum Alloy |
| Wear Resistance | Moderate | High (HRC 56°) |
| Maintenance Interval | Frequent | Extended Service Life |
| Operational Downtime | High Risk | Minimised / Reliable |
Frequently Asked Questions
The bottom roller (track roller) supports the entire weight of the machine and transmits it to the ground, while the top roller (carrier roller) supports the track chain to prevent sagging.
A hardness of HRC 56° ensures that the roller surface resists abrasion and pitting, allowing the machine to operate in rocky or sandy environments without rapid wear.
Yes, we manufacture parts compatible with Komatsu, Caterpillar, Hitachi, Volvo, Kobelco, Sumitomo, and other major brands. Please provide your model number for verification.
Standard rollers often have shallow hardening. A 6mm depth ensures that even as the surface wears down over time, the core remains hard, extending the overall life of the component.
Every single roller is submerged in water after assembly to test the sealing property of the floating seals and O-rings, ensuring no contaminants can enter.
We use high-hardness wear-resistant alloy chrome and molybdenum for floating seals, paired with elastic rubber O-rings to ensure a tight, durable seal.
