Adhesive-Compatible Subassembly Retainer for High-Specification Drivetrain Bracket Systems

Customer Challenge

A global leader in drivetrain systems required a subassembly retainer solution for axle, CV joint, and driveshaft bracket assemblies as joint designs became more demanding than earlier retaining methods could accommodate.
Earlier generations of the assembly used hot melt resin as a temporary shipping retainer applied over nylon threadlocking on phosphate-coated fasteners. While effective, hot melt resin required heat during application, was dimensionally variable, had inherent problems under cold shipping conditions, and would often delaminate over time. As corrosion-resistant surface finishes replaced phosphate coatings and adhesive threadlockers replaced nylon locking patches, the original hot melt resin process was no longer a viable solution.
The redesigned joint required the retainer to perform two functions: temporarily securing the components together for shipping while also holding the bracket in position on the subassembly.
Reintroducing a heat-applied retainer was not an option because the required heat would destroy the adhesive threadlocker already applied to the fasteners.

Heat-Free Application: Provide a retainer that can be applied without induced heat, preserving the integrity of the adhesive threadlocker.
Dual Retention Function: Secure the components together during shipping while maintaining bracket position on the subassembly.
System Compatibility: Perform effectively alongside corrosion-resistant surface finishes, adhesive threadlockers, and other materials used throughout the joint system.
Adhesion, Flexibility, and Durability: Deliver the mechanical properties required for the updated drivetrain assembly.
Compressed Development Timeline: Support product development, evaluation, and testing conducted internationally within a tight project schedule.

Tectorius developed a new retaining compound specifically for the customer's upgraded drivetrain joint system. Product development was particularly challenging because evaluation and testing were conducted overseas under a compressed project schedule.
Tec-Stay® 528 delivered the required adhesion, flexibility, and durability without the need for induced heat during application, allowing the adhesive threadlocker on the fasteners to remain intact throughout the assembly process.
The solution fulfilled both required retention functions by securing the assembly for shipping while maintaining bracket position on the subassembly, replacing the previous hot melt resin approach.
Tec-Stay® 528 has since been implemented in several automotive and truck drivetrain systems, demonstrating its effectiveness in demanding assembly applications.