Dingtai manufactures high-strength Hitachi sprockets that transfer final drive torque and guide track chain engagement in excavator undercarriage systems.
We operate as a factory-direct supplier, providing complete OEM manufacturing services and custom sprocket solutions for global equipment distributors and fleets.
This component resists tooth wear and pitch elongation, reducing unplanned downtime and preventing premature track chain replacement in demanding excavation operations.
With over 20 years of heavy machinery parts production and ISO9001/SGS-certified facilities, Dingtai delivers batch-to-batch consistency and verified metallurgy.
Spare sprockets use hardened 35MnB/40MnB steel with deep tooth induction hardening to achieve long service life under shock loads.
Core Selling Points
- Premium 35MnB Material: Forged 35MnB/40MnB steel delivers high tensile strength and fatigue resistance, preventing tooth deformation under continuous excavator shock loads.
- Deep Quenching/Heat Treatment: Induction-hardened tooth surfaces reach HRC 50–55 with 6–10 mm depth, improving wear resistance while maintaining a tough core.
- Global Brand Compatibility: We produce direct-fit Hitachi sprockets for EX, ZX, and ZAXIS series, matching OEM part numbers and bolt patterns.
- ISO9001/SGS Certified: Every batch undergoes dimensional inspection, hardness testing, and ultrasonic flaw detection to meet ISO9001 and SGS quality requirements.
Our catalog of Hitachi Sprockets includes various specifications, fully compatible with Hitachi excavators and bulldozers.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 35MnB / 40MnB forged alloy steel |
| Tooth Surface Hardness | HRC 50–55 |
| Hardened Depth | 6–10 mm |
| Manufacturing Process | Precision forging, CNC machining, induction hardening |
| Certification | ISO9001:2015, SGS |
| Warranty | 12 months against manufacturing defects |
2. OEM & Customization
We match original drawings or samples, produce custom tooth counts, bore sizes, and bolt patterns, and strictly adhere to Hitachi OEM dimensions for direct fitment.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Mid-size Excavators | Hitachi | EX200, EX210, ZX200, ZX210, ZX240 |
| Large Excavators | Hitachi | EX300, EX350, ZX330, ZX350, ZX470 |
| Mining Excavators | Hitachi | EX800, EX1200, ZX670, ZX870 |
| Bulldozers / Crawler Carriers | Hitachi | Custom undercarriage models on request |
4. Delivery & Logistics
We ship from Quanzhou/Xiamen ports with reliable logistics, factory-direct pricing, and flexible order quantities. Stock sprockets ship quickly; custom orders follow confirmed drawings.
Technical Features
Sprocket teeth are precision-machined to match track chain pitch, distributing load evenly across track bushings and reducing localized undercarriage stress.
Induction-hardened tooth flanks achieve HRC 50–55 while the core retains toughness, preventing tooth fracture under rock and demolition shock loads.
Bolt-on segmented rim designs allow field replacement without removing the track frame, cutting labor time and maintenance downtime.
Applications
- Mining and quarrying
- Road and bridge construction
- Demolition and site clearing
- Forestry and pipeline projects
- Heavy civil earthmoving
Frequently Asked Questions
1. What is the MOQ for Hitachi sprockets?
Stock models start at 1–4 pieces. Custom OEM orders typically require 10–20 pieces depending on tooth count and bolt pattern.
2. What is the delivery time?
Stock sprockets ship in 7–15 days. Custom manufacturing takes 25–35 days after drawing approval.
3. What material and hardness do you use?
Forged 35MnB or 40MnB steel. Tooth surfaces are induction hardened to HRC 50–55 with a depth of 6–10 mm.
4. How do I confirm the correct part number?
Provide the Hitachi part number, machine model, tooth count, or rim bolt pattern. Our engineers confirm interchange and dimensions.
5. What warranty is included?
12 months against material and manufacturing defects under normal operating conditions.
6. Can Dingtai produce non-standard or reinforced sprockets?
Yes. We customize tooth count, bolt circle, core material, and heat treatment for mining or high-impact applications.
7. Do you provide samples?
Sample orders are available for stock models. Custom samples require tooling confirmation before production.
8. What packaging do you use?
Export-standard plywood cases with rust protection. Orders are palletized or containerized based on size and destination.
Maintenance Guide
- Inspect sprocket teeth monthly for sharpening, hooking, or root cracking. Replace before tooth tips become pointed to avoid track chain damage.
- Check track tension frequently. Loose track accelerates sprocket tooth and track bushing wear, while over-tight tension increases undercarriage load.
- Replace sprockets together with track chain if pitch elongation exceeds 2–3 percent to prevent mismatched wear and power loss.
- Keep undercarriage clean; remove debris packed in sprocket root. Abrasive material accelerates tooth wear and premature component replacement.
- Verify bolt torque on segmented sprockets every 250 operating hours to prevent bolt loosening and rim separation.