This SAE Recommended Practice describes test procedures for evaluating hardware used in Type 1 and Type 2 motor vehicle seat belt assemblies. NOTE: The hardware test procedures covered in this report are intended to supercede those now reported in SAE J4c. Related hardware performance requirements are under development and will be covered in a separate SAE Recommended Practice. Test procedures and performance requirements for seat belt retractors will like wise be covered in separate SAE Recommended Practices to be issued later.