SAE J274-1989 RATED SUSPENSION SPRING CAPACITY

Foreword-This Document has not changed other than to put it into the new SAE Technical Standards Board Format.

1. Scope-The Rated Suspension Spring Capacity definition has been developed to assist engineers and designers in the preparation of specifications and descriptive material and values relating thereto.
1.1 Purpose-The following definition of Rated Suspension Spring Capacity is applicable to all types ofsuspensions designed for vehicles used predominantly on the highway. This capacity provides a basis for comparison of spring load carrying abilities in a particular suspension application. This definition is intended to clarify a commonly used term which has heretofore been used indiscriminately.

2. References
2.1 Applicable Publication-The following publications form a part of the specification to the extent specified herein. Unless otherwise indicated the lastest revision of SAE publications shall apply.
2.1.1 SAE PUBLICATION-Available from SAE,400 Commonwealth Drive, Warrendale, PA 15096-0001
HSJ670

3. Definitions
3.1 Rated Suspension Spring Capacity-A load rating assigned to each spring installation and vehicle application which will provide adequate spring durability and vehicle stability under all intended load conditions. The value of the load rating must equal or exceed that portion of the maximum allowable force ofgravity(usually called ' weight' and equaling mass times acceleration of gravity) at the ground which relates directly to the spring. Therefore, the load rating is based on the total of sprung and unsprung forces of gravity
(usually called' sprung weight' and ' unsprung weight) of the loaded vehicle
3.2 Spring-Includes all types of suspension springs(such as: leaf, coil, torsion bar, rubber, pneumatic, etc.).

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