Description
Precision-Engineered Fracture Bolt for Cummins Diesel Engine Integrity
The Cummins 3927948 Fracture Bolt is a specialized, high-precision fastener designed for critical mounting applications in Cummins diesel engines. Also known as a break-off bolt, this component is engineered with a pre-determined shear point that guarantees a fixed torque setting and prevents unauthorized disassembly or over-tightening, making it ideal for engine tamper-proofing and precise component alignment.
This bolt is widely used in Cummins engine systems such as timing gear assemblies, fuel pump brackets, and other secure-fit engine components. With superior strength and a carefully calibrated break torque threshold, the 3927948 fracture bolt helps ensure structural integrity while simplifying service and assembly operations.
Product Overview
The 3927948 fracture bolt is a critical component in Cummins diesel engines, particularly in high-security or factory-calibrated installations. Once torqued to specification, the bolt’s head shears off, leaving only the threaded portion embedded—preventing further adjustment or tampering. This design maintains engine factory settings and ensures long-term stability of mounted components.
Key Features:
Tamper-Proof Design: Once installed, the bolt head breaks off at a predetermined torque, preventing further manipulation.
OEM Certified: Built to Cummins’ original equipment specifications for guaranteed compatibility and reliability.
High-Tensile Material: Manufactured from hardened alloy steel to withstand stress, heat, and corrosion in diesel engine environments.
Precision Break Torque: Ensures consistent installation performance, especially in critical engine mounting locations.
Ideal for Assembly-Line Applications: Commonly used where permanent, non-adjustable fastener solutions are required.
Technical Specifications
| Attribute | Details |
|---|---|
| Part Number | 3927948 |
| Product Type | Fracture Bolt (Break-off Head Bolt) |
| Application | Cummins diesel engines |
| Material | Hardened steel alloy |
| Surface Finish | Phosphate-coated / Zinc-plated |
| Thread Type | Metric / UNC (as specified) |
| Shear Torque | Factory-calibrated (varies by engine type) |
| Installation Method | Torque wrench until head shears off |
| OEM Standard | ISO/TS 16949 |
Common Applications
The 3927948 fracture bolt is used in a variety of Cummins engine models, particularly in areas where security, precision, and tamper resistance are critical. Key applications include:
Fuel Pump Mounting Brackets
Ensures fuel system alignment and security without the risk of unauthorized adjustment.Timing Gear Cover Assembly
Provides stable, tamper-proof fastening of gear housings to ensure proper synchronization.Turbocharger Brackets
Helps secure heavy turbo assemblies that must remain factory-aligned under pressure and heat.Emission Control Systems
Frequently used in EGR and SCR systems where tamper-proof installation is mandated by emission regulations.
Advantages of the 3927948 Fracture Bolt
Improved Engine Reliability: By eliminating the risk of over-tightening or disassembly, the fracture bolt helps maintain factory tolerances and alignment.
Security Assurance: Ideal for components subject to warranty, emissions compliance, or operational tamper prevention.
Consistent Installation: Ensures uniform installation torque without the need for torque measurement after breakage.
Maintenance Simplicity: Reduces installation time and ensures that installed fasteners remain unchanged throughout the engine’s service life.
Installation Notes
Prepare Threads: Clean mating surfaces and apply anti-seize compound if specified.
Torque to Break Point: Use a calibrated torque wrench. The bolt head will shear off when proper torque is achieved.
No Retightening Needed: Once broken off, the bolt should not be reused or adjusted.
Replacement Guidelines: Fracture bolts are single-use only. Always replace with OEM part during service.
