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?
Aluminum 2024-T4 (UNS A92024)
Common Trade Name: Aluminum 2024-T4
Approx. Room Temp. Mechanicals: UTS = 58 ksi, YS = 40 ksi
Typical % Compositions Summary: Al 90.7 – 94.7, Cr .1, Cu 3.8 – 4.9, Fe .5, Mg 1.2-1.8, Mn .3 -.9, Si .5, Ti .15, Zn .25
Corrosion Resistance: Good strength to weight ratio, fatigue resistance and average machinability.
Aluminum 6061-T6 (UNS A96061)
Common Trade Name: Aluminum 6061-T6
Approx. Room Temp. Mechanicals: UTS = 45 ksi, YS = 40 ksi
Typical % Compositions Summary: Al 95.8 – 98.6, Cr .04 – .35, Cu .15 – .40, Fe .70, Mg .80-1.2, Mn .15, Si .40 – .80, Ti .15, Zn .25
Corrosion Resistance: Combines relatively high strength, good workability, and high resistance to corrosion; widely available.
Aluminum 7075-T6 (UNS:A97075)
Common Trade Name: Aluminum 7075-T6
Approx. Room Temp. Mechanicals: UTS = 83 ksi, YS = 73 ksi
Typical % Compositions Summary: Al 87.1 – 91.4, Cr .18 – .28, Cu 1.2 – 2.0, Fe <= .50 max., Mg 2.1 – 2.9, Mn <= .30 max., Si .40 max., Ti .20 max., Zn 5.1 – 6.1
Corrosion Resistance: Very high strength material used for highly stressed structural parts.
Common Applications for Industrial Fasteners
- Sports and Recreation