Selecting the Correct Aluminum Fastener Alloy

When selecting an aluminum alloy and temper for a specific end use, first check any pertinent specifications. Often, the specification will state which alloy should be used or is required for use as well as the final temper of the part. In many cases, fasteners cannot be formed from wire produced to final temper. In these cases, we work with manufacturers to determine which temper wire should be provided.

Choosing the correct alloy and temper combination is probably the most critical step in the fasteners production process. The wrong alloy or temper will virtually always lead to failure of the fastener. When choosing an alloy, give special attention to the strength requirement. Examine how stress is applied to the fastener. Ask these questions: Will the principal load be applied longitudinally or in transverse? Should the yield strength be controlled as well as the tensile?