2024-T4 type aluminum alloy (containing 4.5% copper, 1.6% manganese, 1.5% magnesium, and the rest is aluminum) is a heavy-duty alloy. It achieves a balance in the combination of strength, corrosion resistance, manufacturability, and economy, and is widely used in the manufacture of threaded fasteners.

Bolts, screws and stud bolts made of 7075-T73 aluminum alloy (contains 1.6% copper, 2.5% manganese, 0.3% chromium, and the rest is aluminum) have made slight improvements in strength, and due to " T73" special heat treatment process, so that it can prevent the occurrence of stress corrosion to a large extent. However, its high cost has limited its popularity.

6061-T6 aluminum alloy (contains 0.6% silicon, 0.25% copper, 1% magnesium, 0.2% chromium, and the rest is aluminum) can be used to design internal and external threaded fasteners with higher requirements for corrosion resistance .

The 6062-T9 aluminum alloy (containing 0.6% silicon, 0.25% copper, 1% magnesium, 0.09% chromium, 0.5% lead, and the rest is aluminum) is almost exclusively for design nuts. This alloy is stronger than 6061-T6 aluminum alloy and has relatively better corrosion resistance.

The full-thickness nut made of 6062-T9 aluminum alloy has enough strength to match the bolts made of 2024-T4 or 7075-T73 aluminum alloy. Machine screws, nuts and other 1/4 inch and smaller nuts are made of 2024-T4 aluminum alloy.

The four aluminum alloys that have been mentioned are widely used in the manufacture of threaded load-bearing fasteners, while other aluminum alloys are used in the manufacturing of other types of fasteners. The small solid, half pipe and blind rivets are made of 1100-F, 5052-F, and 5056-F aluminum alloys respectively. The heat-treatable 2017-T4, 2117-T4, 2024-T4, 6061-T6 aluminum alloy and the relatively newly developed 7075-T73 aluminum alloy have superior shear strength and do not require "pre-transmission treatment". Can be driven.

Fastener processing tells you that flat washers are usually made of aluminum-plated 2024-T4 alloy; spiral spring washers are usually made of 7075-T6 alloy; tapping screws can be made of 7075-T6 alloy; self-tapping screws are made of the same material The alloy is anodized. The 2011-T3 aluminum alloy (containing 5.5% copper, 0.5% lead, 0.5% bismuth, and the rest is aluminum) can be used to make parts for thread cutting machines.