Thickened M12 carbon steel washers, specifically designed for soft aluminum housing connections, 2.5mm thick, distribute pressure to prevent crushing.

Soft aluminum housings are most susceptible to dents and even cracks when bolts are tightened. Our thickened M12 carbon steel washers, 2.5mm thick, significantly increase the bearing area, effectively distributing bolt pressure and preventing crushing at the source. We also offer a full range of fasteners, such as galvanized thin nuts, which are readily available to meet the needs of thin-walled mounting within cabinets.

Have you ever encountered this problem when tightening M12 bolts on aluminum housings, aluminum alloy panels, or soft metal structures: the washer is too thin, leaving a dent on the aluminum surface after tightening, or even deforming the housing? This is because ordinary washers are not thick enough, resulting in excessive pressure concentration. To address this issue, we have specially designed thickened M12 carbon steel washers, 2.5mm thick, specifically for soft aluminum housing connections.

Here are its core performance advantages:

1. 2.5mm Thickened Design for Even Pressure Distribution

Compared to conventional 1.5~2mm washers, the thickened carbon steel M12 washer has a larger contact area, transforming bolt tightening force from point contact to surface distribution. Even on soft aluminum surfaces with lower hardness, localized crushing will not occur. Laboratory tests show that using this washer reduces the indentation depth on the aluminum shell surface by more than 70%.

2. Carbon Steel Material + Surface Treatment for Wear Resistance and Rust Prevention

Made of high-quality 45# steel, with moderate hardness that does not damage aluminum parts. The surface can be galvanized or Dacromet treated, offering excellent rust resistance. If you also need thin anti-loosening fasteners in electrical cabinets, we also have a series of galvanized thin nuts. The zinc layer is uniform and only half the thickness of conventional nuts. Used in conjunction with the thickened carbon steel M12 washer, they can excel in various scenarios.

3. Optimized for Soft Aluminum Housings, Eliminating the "Trapping" Problem

Many users try using ordinary flat washers with spring washers, only to find that the washers still damage the aluminum surface after the spring washers break. The thickened carbon steel M12 washers, with their inherent thickness and rigidity, can withstand pressure independently without spring washers, making them particularly suitable for connecting thin-walled aluminum components such as battery pack housings, LED light bodies, and instrument chassis.

4. High Versatility and Easy Installation

The inner hole is precision machined to φ13mm, compatible with M12 bolts, with an outer diameter up to φ28mm. They can be quickly fitted in by hand or pneumatic tools without altering the existing assembly process.

In addition to the thickened carbon steel M12 washers, Aozhan Hardware also provides a one-stop solution from galvanized thin nuts to high-strength bolts. Whether you need sample testing, bulk customization, or want to compare the impact of different washer thicknesses on soft aluminum housings—contact us for the professional selection advice and product support you need.