Dingtai manufactures heavy-duty Kato spring coils for excavator undercarriage systems. These coils maintain track tension and absorb severe shock loads during digging, travel, and swing operations.
We are a factory-direct supplier providing complete OEM and replacement production for global equipment owners, dealers, and fleet maintenance teams seeking Kato-compatible spring coils.
Our Kato spring coils resist sagging, cracking, and fatigue failure. They reduce unplanned downtime by keeping track recoil and tensioning systems stable on abrasive job sites.
With over 20 years of engineering machinery parts manufacturing, Dingtai holds ISO9001 and SGS certifications. Every spring coil is produced under strict quality control.
We use high-tensile spring steel, precise hot coiling, controlled quenching and tempering, and shot peening to deliver consistent elasticity and long fatigue life.
Core Selling Points
- Global Brand Compatibility: Direct replacement compatibility with Kato OEM part configurations. We match wire diameter, free length, and spring rate for correct recoil and tensioning performance.
- Deep Quenching/Heat Treatment: Controlled hardening and tempering processes deliver optimal hardness, toughness, and fatigue strength under repeated compressive loads in severe undercarriage conditions.
- ISO9001/SGS Certified: ISO9001 and SGS certification plus batch traceability ensure material quality, dimensional accuracy, and consistent performance for every Kato spring coil.
- OEM Capabilities: We produce according to customer drawings, samples, or OEM part numbers, offering custom dimensions, spring rates, coating, and private-label packaging.
Our catalog of Kato spring coils includes various specifications, fully compatible with Kato excavator models and related track-type equipment.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 60Si2Mn / 55CrSi high-tensile spring steel |
| Hardness | HRC 42–50 after quenching and tempering |
| Process | Hot coiling, controlled heat treatment, shot peening, anti-rust coating |
| Dimensional Control | 100% inspection of free length, coil diameter, and total coils |
| Certification | ISO9001 / SGS |
| Warranty | 12 months / 2,000 working hours |
2. OEM & Customization
We produce Kato spring coils to OEM drawings or samples, matching free length, wire diameter, coil pitch, and spring rate. Custom part numbers and packaging are available.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Crawler Excavator | Kato | HD250, HD308, HD512, HD820, HD1023, HD1430 |
| Mini Excavator | Kato | 9V, 12V, 18V, 25V, 35V |
| Track Tensioner / Recoil Assembly | Kato | OEM part number matched |
4. Delivery & Logistics
Factory-direct pricing, flexible MOQ from one piece, and reliable export packing. We ship via ocean or air freight to major US ports and forwarder networks.
Technical Features
Kato spring coils are engineered from high-tensile spring steel and heat-treated to retain consistent spring force under repeated compression cycles.
Shot peening creates a compressive surface layer that resists crack initiation in abrasive environments. Precise coil geometry prevents misalignment and uneven loading.
Dimensional inspection verifies free length, coil diameter, and load height. This ensures the recoil mechanism returns smoothly and maintains correct track tension.
Applications
- Mining
- Road Construction
- Quarrying
- Heavy Earthworks
- Demolition
- Forestry
- Infrastructure Projects
Frequently Asked Questions
Q1: What is the minimum order quantity for Kato spring coils?
A: MOQ is one piece for stock samples. Larger production quantities offer better factory-direct pricing.
Q2: What is the delivery time?
A: Standard models ship in 15–25 days. Custom production requires 30–45 days depending on specifications and order volume.
Q3: What material and heat treatment do you use?
A: We use 60Si2Mn or 55CrSi spring steel, quenched and tempered to HRC 42–50, with shot peening for fatigue resistance.
Q4: Do you offer a warranty?
A: Yes, 12 months or 2,000 working hours against material and manufacturing defects under normal operating conditions.
Q5: Can you match Kato OEM part numbers?
A: Yes. Provide the OEM part number, drawing, or sample. We confirm dimensions, spring rate, and end configuration before production.
Q6: How do I confirm fitment?
A: Send the Kato machine model, serial number, and existing part number. Our engineers verify compatibility before quotation.
Q7: How are spring coils packaged for export?
A: Anti-rust coating, individual wrapping, and wooden crate or pallet packaging protect coils during ocean and land transport.
Maintenance Guide
- Inspect the spring coil for cracks, corrosion, and uneven coil spacing every 500 working hours or during track maintenance.
- Check track tension and recoil movement. A seized adjuster or misaligned cylinder overloads the spring and accelerates fatigue failure.
- Replace coils as a pair if free length is below specification or permanent deformation is visible.
- Keep coil seats clean and follow OEM torque values during installation. Never heat or weld the spring.