The specifications for commonly used paper corners, also known as edge protectors or corner protectors, can vary depending on the specific application and industry. However, here are some commonly encountered specifications:

1. Thickness: Paper corners typically come in various thicknesses, ranging from 1.5 mm to 10 mm or more. Thicker paper corners provide greater protection and stability.

2. Length and Width: The length and width dimensions of paper corners vary to accommodate different sizes of products and packaging requirements. Common lengths range from 2 inches (50 mm) to 120 inches (3 meters) or longer. Widths can vary from 1 inch (25 mm) to 4 inches (100 mm) or more.

3. Material: Paper corners are often made from recycled paperboard or solid fiberboard. The material used determines the strength, rigidity, and environmental sustainability of the corners.

4. Load-Bearing Capacity: The load-bearing capacity of paper corners is an important specification to consider, as it determines how much weight they can support without deforming or collapsing. This capacity is often indicated by the maximum compression strength of the corners, typically measured in pounds or kilograms.

5. Coating or Treatment: Some paper corners may feature additional coatings or treatments to enhance their moisture resistance, durability, or friction properties.

It's important to note that specific industries or applications may have unique requirements for paper corners. For example, the specifications for paper corners used in the furniture industry might differ from those used in the packaging or shipping industry. Therefore, it's recommended to consult with suppliers or manufacturers specialized in your particular industry to determine the commonly used paper corner specifications for your specific needs.