Aluminum 7075

It is strong, with a strength comparable to many steels, and has good fatigue strength and average machinability. It has lower resistance to corrosion than many other aluminium alloys.7075 are often used in Climbing equipment, bicycle parts, automotive jump valve parts, turbines, keys, gears and shafts, fuse parts, instrument shafts and gears, mechanical equipment, fixtures, aircraft parts

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  1. General Details
    Process Lead Time Finish Options Tolerance Applications
    CNC Mill
    CNC Lathe
    3 days (rush)
    5-7 days (standard)
    Sanding, hand-polishing, bead-blasting.
    Anodization available in a variety of colors.
    ISO 2768 Light & economic, used from prototyping to production

    Introduced by Alcoa in 1943, alloy 7075 has been the standard workhorse 7XXX series alloy within the aerospace industry ever since. It was the first successful Al-Zn-Mg-Cu high strength alloy using the beneficial effects of the alloying addition of chromium to develop good stress-corrosion cracking resistance in sheet products. Although other 7XXX alloys have since been developed with improved specific properties, alloy 7075 remains the baseline with a good balance of properties required for aerospace applications. Alloy 7075 is available in bare and alclad sheet and plate product forms in the annealed state as well as several tempers of the T6, T73 and T76 types.

    Aluminum 7075 is strong, with good fatigue strength and average machinability, but is not weldable and has less resistance to corrosion. Cost is relatively high. 7075 is often used in aircraft including wings and fuselages, rock climbing equipment and bicycle components.

  2. Material Properties
    Yield Strength (tensile) Elongation at Break Hardness Density Maximum Temp McMaster Part Number
    61,000 psi 11% Brinell 150 2.768 g/㎤
    0.1 lbs / cu. in.
    890° F 8885K921
  3. Material Finish

    Untreated aluminum generally has a dull silver/grey finish which varies depending on the roughness of the surface.

    Many consumer products made with aluminum are anodized, most notably the MacBook Pro. Anodization allows the introduction of a variety of color options and adds a consistent shine across the entire part.

    Aluminum can also be media-blasted, sanded, and hand-polished to achieve a multitude of surface finishes. Alodine is often used as an alternative protective coating to anodize on aluminum parts, and can be clear or gold in color.

    Alloy 7075 has been thoroughly evaluated for corrosion resistance of atmospheric weathering, stress-corrosion cracking and exfoliation in all currently available tempers. These values have been used as a standard for comparison in the development of more recent high strength aerospace alloys. Within the 7XXX series of alloys,resistance to general corrosion attack, SCC and exfoliation improves significantly in the overage tempers (T7 type) compared with peak strength tempers (T6).
    Generally, the T76 type temper is considered the exfoliation resistant temper, while the T73 type temper is considered the SCC resistant temper. It should be noted that T73 is as resistant to exfoliation as T76, but at lower strength levels.For applications where good surface appearance is required or in corrosive environments, alclad 7075 sheet and plate products are recommended

  4. Design Recommendations
    Min Wall Thickness Min End Mill Size Min Drill Size Max Part Size Undercuts Radii : Depth
    0.5 mm 0.8 mm
    (0.03 in)
    0.5 mm
    (0.02 in)
    1200 x 500 x 152 mm[(x,y,z] (mill)
    152 x 394 mm
    [d,h] (lathe)
    Square profile,
    full radius,
    dovetail profiles
    Depth must not exceed 12x drill bit diameter.
    For end mills, depth must not exceed 10x tool diameter.