Black Cast Iron Weight Bumper Plates Set On Sale

A variety of barbell pieces are optional, rubber material, PU material, according to the different needs of customers can be customized production, you can customize the logo for customers. Specifications with kg and pound value: 2.5kg,5kg,10kg, 15kg,20kg, 25kg. 10lb, 15lb, 25lb. 35lb.45lb.

Core features
Copper Bushing design
The copper sleeve refers to the copper ring sleeve embedded in the center hole of the barbell plate. Its function is to reduce the direct metal friction between the barbell plate and the barbell rod. The natural lubricity and wear resistance of copper make the rotation smoother and extend the service life of the equipment. It is especially suitable for high-frequency use (such as deadlifts, grabs and other actions).

Colored coating
The surface is treated with an environmentally friendly spraying process. Different weights are matched with bright colors (such as 20kg red, 15kg blue, 10kg green, etc.), which makes it convenient and quick to identify the weight and enhances the visual impact at the same time, meeting the aesthetic requirements of modern gyms.

Materials and Craftsmanship

Inner core: Usually made of high-density cast iron to ensure accurate weight (with an error of ±1% or less).

Outer layer: Wrapped with rubber or PU (polyurethane) to reduce ground impact noise and protect the floor and the sheet.

Copper sleeve reinforcement: Some high-end brands will use bronze alloy and carry out anti-rust treatment.

2. Advantage Analysis
Durability
Copper sleeves are more wear-resistant than ordinary steel sleeves or plastic sleeves. Even after long-term use, they can still maintain smooth rotation and avoid the "jamming" phenomenon.

Professionalism
Suitable for Olympic weightlifting and functional training, it features high rotational flexibility and a more natural movement trajectory.

Silent and shockproof
The outer rubber buffer design reduces the noise when the barbell plates fall, making it suitable for comprehensive training venues.

Aesthetics and Logos
The colorful design enhances the recognition of the equipment and simultaneously elevates the overall grade of the gym.

3. Common Specifications and configurations
Weight range
It usually ranges from 0.5kg (small pieces) to 25kg (large pieces), and common sets are 2.5kg, 5kg, 10kg, 15kg, 20kg, and 25kg.

Diameter standard
Comply with the standards of the International Weightlifting Federation (IWF), for example:

The diameter of the 25kg sheet is approximately 450mm (ensuring that the barbell bar is at a sufficient height from the ground when it lands).

Diameter of the central hole
50mm (compatible with standard rods), the inner diameter of the copper sleeve is slightly larger than 50mm to reduce friction.

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