Cummins Hex Jam Nut S249-20 CCEC – Secure locking for stable engine assemblies

The Cummins Hex Jam Nut S249-20 CCEC is designed to lock threaded connections and prevent loosening during engine operation. As part of the Cummins parts range, this jam nut helps maintain stable assemblies in environments with constant vibration and load changes. In addition, it meets Cummins genuine paers standards and CCEC parts manufacturing requirements, which ensures accurate thread fit and consistent locking performance. Although small, this component plays an important role in overall engine reliability. Technicians commonly use it during engine assembly, component replacement, and routine maintenance. At the same time, proper locking helps protect connected parts from wear and misalignment.

🔩 Specifications

• Part number: S249-20

• Product type: Hex jam nut

• Brand compatibility: Cummins engines

• System location: Engine and auxiliary component assemblies

• Primary function: Thread locking and vibration resistance

• Manufacturing reference: CCEC parts standards

• Quality level: Cummins genuine paers compliant

⭐ Key Features

First, this hex jam nut provides strong locking force to secure threaded connections. In addition, it helps prevent loosening caused by vibration or thermal cycling. Moreover, its durable material resists wear and corrosion during long-term use. As a result, assemblies remain stable and service intervals are extended. Also, the slim jam nut design allows use in tight spaces where standard nuts may not fit. Because it belongs to trusted Cummins parts and CCEC parts, users can expect consistent locking performance across service cycles.

⚙️ Technical Insights

The Cummins Hex Jam Nut S249-20 CCEC works by tightening against another nut or a fixed surface to create locking tension. Therefore, it holds fasteners firmly in place during engine operation. At the same time, even load distribution helps protect threads from damage. When technicians install new jam nuts, connection stability improves immediately. Consequently, vibration-related failures and loosening risks are reduced. Since it follows Cummins genuine paers and CCEC parts design standards, it matches original thread specifications without modification.

🛠 Application Scenarios

This hex jam nut is widely used in industrial engines, generator sets, and heavy-duty equipment. For example, it secures brackets, covers, and mounted components that experience constant vibration. Likewise, it fits maintenance tasks where reliable locking is required during reassembly. Service teams rely on Cummins parts like this jam nut to maintain structural integrity and reduce downtime. Across these applications, CCEC parts help ensure stable operation and long-term reliability.

📦 Availability

This hex jam nut is in stock and available for global shipping. To ensure correct fitment with your Cummins parts configuration, please provide your engine serial number (ESN). Our support team is ready to assist with verification and confirm compatibility with Cummins genuine paers and CCEC parts before shipment.