Bolts and Nuts for Excavators Final Drive Sprockets
These sprocket bolts and nuts are specially designed for securing the drive sprockets of crawler excavators. Manufactured with high-grade 40Cr steel and treated to achieve Grade 12.9 hardness, they ensure extreme durability, torque resistance, and vibration stability in the most demanding conditions. Compatible with a wide range of final drive sprocket configurations across major excavator brands.
| Material | 40CR |
|---|---|
| Grade | 10.9/12.9 |
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Kinton Parts is trusted by professionals worldwide for delivering high-quality parts for excavators, bulldozers, and other construction machinery—with guaranteed performance and durability.
Our Sprocket Part Bolt and Nut are specifically engineered to secure the sprocket firmly to the final drive hub of tracked excavators and bulldozers. These bolts endure tremendous torque and vibration from the undercarriage drive system, making their quality and reliability critical for equipment safety and performance. Manufactured from high-grade 40Cr alloy steel and heat-treated to Grade 12.9 tensile strength, our bolts and nuts deliver superior durability, precise thread engagement, and long service life even in the harshest working conditions.
Whether you're replacing worn sprocket hardware or assembling new final drives, our bolts and nuts ensure tight locking, resistance to loosening, and OEM-level fitment across various brands.
Material and Mechanical Grade
Our sprocket bolts and nuts are made from:
- Material: 40Cr alloy steel
- Hardness Class: Grade 12.9 (heat-treated and quenched)
- Surface Finish: Black oxide, zinc plating, or phosphating (optional)
- Thread Type: Metric coarse thread by default (fine thread available upon request)
These materials and treatments result in excellent tensile strength, fatigue resistance, and corrosion protection.
Manufacturing Process
The production process ensures both structural reliability and dimensional accuracy:
Raw Steel Rods
High-quality 40Cr steel rods are selected and precision cut to length before hot forging.
Hot Forging & Head Shaping
Using red-hot steel billets, the bolt heads are formed through controlled press forging, ensuring structural consistency and mechanical strength.
Pre-Thread Machining
After head shaping, each bolt undergoes pre-machining to prepare for threading, with critical dimension control.
Inspection & Final Packaging
All bolts, nuts, and washers are dimensionally inspected, surface-treated, and packed as kits.
Key Features
- Precision-Forged Heads for tight, vibration-resistant fit in the sprocket mount.
- High Tensile Strength: Up to 1200 MPa, ideal for high-load final drive assemblies.
- Thread Integrity: Rolled thread with uniform pitch ensures maximum grip.
- Matched Nut and Washer: Supplied with hardened lock nuts and optional flat washers for secure mounting.
Application Area
These sprocket bolts and nuts are compatible with:
- Final drive sprockets on excavators, bulldozers, and crawler-type machinery.
- Brands such as Caterpillar, Komatsu, Doosan, Hitachi, Hyundai, Volvo, and more.
Used to secure the sprocket to the final drive hub, they must withstand high rotational forces and impact loading during excavation or dozing.
Common Sizes & Dimensions
| Bolt Size | Thread | Length | Grade | Matched Nut |
|---|---|---|---|---|
| M12×35 | Coarse | 35mm | 12.9 | M12 flange nut |
| M14×40 | Coarse | 40mm | 12.9 | M14 flange nut |
| M16×45 | Coarse | 45mm | 12.9 | M16 hex nut |
| M18×50 | Coarse | 50mm | 12.9 | M18 lock nut |
| M20×55 | Coarse | 55mm | 12.9 | M20 lock nut |
Installation Tips
- Always clean the sprocket and hub mounting surfaces before installation.
- Use thread-locking compound when installing in high-vibration environments.
- Apply torque according to equipment manual (usually between 280–420 Nm depending on size).
- Replace bolts and nuts whenever signs of thread damage, stretch, or wear are detected.
Inquire with Part Numbers or Drawings
We support:
- OEM reference matching
- Custom manufacturing based on your sprocket bolt drawings or samples
Contact us today for a quote or to verify part compatibility.
SHIPPING & DELIVERY
At Kinton Parts, we ensure reliable, worldwide shipping of parts for excavators, bulldozers, and a full range of construction machines—safe, fast, and secure.
All products are securely packed using high-quality export cartons, reinforced wooden cases, or industry-standard palletized packaging to ensure maximum protection during transit and smooth handling during unloading.
Standard orders are typically shipped within 3–5 working days, while large or customized orders are usually dispatched within 7–20 days, depending on volume and production requirements.
We offer flexible global shipping options, including:
- International sea freight for cost-effective bulk transport
- Air freight for urgent orders
- Courier delivery (DHL, FedEx, UPS) for small-volume or sample shipments
Our logistics team manages every shipment carefully, providing real-time updates and tracking information until your order arrives safely at your destination.
Need assistance choosing the best shipping method for your location and timeline? Contact our team — we’ll help you plan a smooth delivery experience.
FAQ
Q: What are your main products?
A: We supply a full range of undercarriage and wear parts for excavators, bulldozers, and other heavy equipment. Our product line includes: Track rollers, carrier rollers, front idlers, sprockets, segments, track shoes, track chains, bolt and nuts, pins and bushings, bucket teeth and adaptors, filters, seal kits, swing bearing, and hydraulic cylinder—plus other essential replacement parts.
Q: Which countries do you export to?
A: Kinton Parts exports to over 60 countries worldwide, including:
USA, Canada, UK, Germany, Russia, UAE, Indonesia, Malaysia, Thailand, India, Pakistan, Bangladesh, Sri Lanka, South Africa, Colombia, Peru, and many others.
Q: Can I order a sample?
A: Yes, we accept trial orders. For parts in stock, samples can be shipped quickly. If you have technical drawings or existing samples, we also support customized production and mold development.
Q: How can I track my order after shipping?
A: Once your order is shipped, we will provide you with all necessary tracking information based on the shipping method. For express deliveries, you’ll receive a tracking number to follow the shipment online. For air or sea freight, we’ll send you the relevant documents such as the airway bill (AWB) or bill of lading (B/L), along with the packing list and commercial invoice to help with tracking and customs clearance.
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Trusted by professionals worldwide, Kinton Parts supplies premium-quality components for excavators, bulldozers, and more—with reliable quality you can count on.
