Dingtai manufactures Sumitomo-compatible sprockets, the drive component that transfers track power and guides track chain engagement in excavator undercarriages.
We operate factory-direct, offering complete OEM manufacturing services. Global clients receive direct pricing, custom production, and consistent component quality.
Worn sprockets cause track slippage, accelerated link wear, and unplanned downtime. Our heat-treated steel sprockets resist deformation and maintain precise pitch engagement.
With 20+ years undercarriage manufacturing experience, Dingtai holds ISO9001 and SGS certifications, ensuring quality control and material traceability.
We use 35MnB alloy steel and deep induction quenching to create a hard wear-resistant tooth surface with a tough impact-resistant core.
- Premium 35MnB Material: Sprockets are forged from high-grade 35MnB steel, delivering superior tensile strength and resistance to bending under severe excavator load conditions.
- Deep Quenching/Heat Treatment: Teeth receive induction hardening with hardened depth up to 12 mm, achieving HRC 50-55 to resist abrasive wear and impact damage.
- Global Brand Compatibility: Dingtai produces sprockets compatible with Sumitomo and Link-Belt excavators, matching OEM pitch, bore, and bolt patterns for retrofit replacement.
- 100% QC Inspection: Every sprocket undergoes dimensional inspection, hardness testing, and magnetic particle testing before shipment, ensuring zero-defect undercarriage parts.
Our catalog of Sumitomo Sprocket includes various specifications, fully compatible with Sumitomo and Link-Belt excavators and bulldozers.
Why Choose Dingtai?
1. Production Technical Parameters
| Parameter | Specification |
|---|---|
| Material | 35MnB / 40Mn2 alloy steel |
| Hardness | HRC 50–55 (tooth surface) |
| Heat Treatment Depth | 8–12 mm |
| Process | Precision forging, CNC machining, induction hardening |
| Certification | ISO9001:2015, SGS material report |
| Warranty | 12 months or 2,000 operating hours |
2. OEM & Customization
We manufacture from your drawings, samples, or OEM part numbers. Custom dimensions are machined to exact tolerance and material specifications.
3. Applicable Models
| Machine Type | Compatible Brands | Popular Series/Models |
|---|---|---|
| Excavator | Sumitomo | SH120-5, SH200-5, SH210-5, SH240-5, SH300-5, SH350-5, SH480HD |
| Excavator | Link-Belt | 210X2, 240X2, 290X2, 350X2, 210LX, 240LX |
| Demolition / Material Handler | Sumitomo / Link-Belt | SH240HD, 290X2, 350X2, R series |
4. Delivery & Logistics
We provide factory-direct pricing and flexible MOQ, shipping worldwide by sea or air. Standard models ship fast; custom orders require production lead time.
Technical Features
Sprocket teeth are CNC-machined with precise pitch geometry. This ensures smooth track chain engagement and reduces shock loads that damage links and pins.
Deep induction quenching hardens the tooth wear surface to HRC 50-55. The core remains tough, preventing tooth breakage under heavy bucket loads or rocky terrain.
Precision-machined bore and bolt patterns guarantee exact hub fit. This eliminates radial runout, protecting final drive seals and extending undercarriage component life.
Applications
- Mining
- Road Construction
- Quarrying
- Demolition
- Forestry
- Heavy Earthmoving
Frequently Asked Questions
Q: What is the minimum order quantity for Sumitomo sprockets?
A: Stock-standard sprockets have an MOQ of 1 piece. Custom-manufactured sprockets typically require 10 pieces per specification.
Q: What is the delivery time?
A: Standard models ship within 15–20 days. Custom OEM production requires 25–35 days depending on order quantity and machining requirements.
Q: What material do you use?
A: We use 35MnB or 40Mn2 alloy steel, depending on the OEM specification, for high strength and wear resistance.
Q: What heat treatment depth can you achieve?
A: Induction hardening depth is 8–12 mm on tooth surfaces, with hardness controlled to HRC 50–55.
Q: Do you offer warranty?
A: Yes, each sprocket carries a 12-month or 2,000-hour warranty against manufacturing defects under normal operating conditions.
Q: Can Dingtai match OEM part numbers?
A: Yes. Provide the Sumitomo or equivalent part number to confirm dimensional match, or send a drawing for custom production.
Q: What are signs of worn sprockets?
A: Hooked or sharp teeth, track popping, and accelerated link wear. Replace when tooth tip wear exceeds 20% or before fitting new track chain.
Maintenance Guide
- Inspect sprocket teeth monthly for hooked, sharp, or chipped profiles. Early detection prevents track chain and pin damage.
- Replace sprockets when tooth tip wear exceeds 20% or when installing a new track chain. Mismatched pitch accelerates wear.
- Maintain correct track tension. Over-tightened tracks increase sprocket tooth pressure and cause premature undercarriage wear.
- Clean mud, rock, and debris from the undercarriage daily. Packed material accelerates abrasive tooth wear and reduces service life.
- Check mounting bolt torque after the first 50 operating hours and at scheduled service intervals. Loose bolts cause wobble and drive failure.