The Caterpillar NBR (75) O-Ring 4D1577 (4D-1577) is a high-quality rubber seal used to prevent leakage and contamination. It is designed for use as an axial or radial seal, making it ideal for various applications.

With a size of 281 inches and a cross-section diameter of 0.14 inches, this O-ring is compatible with a wide range of equipment models, including CATERPILLAR EARTHMOVING COMPACTOR and CATERPILLAR ENGINE - MACHINE. It is specifically designed to fit models such as CATERPILLAR 816F, CATERPILLAR 816F II, CATERPILLAR 826C, CATERPILLAR 815B, CATERPILLAR 815F, CATERPILLAR 815F II, CATERPILLAR 3116, CATERPILLAR 3126B, CATERPILLAR 3176C, and CATERPILLAR 3196.

The main seal material of this O-ring is NBR (nitrile), known for its excellent resistance to oil, fuel, and other common automotive fluids. It has a hardness of 75 Shore A, ensuring durability and longevity.

This O-ring is manufactured in compliance with SAE AS568 Dash Size standards, specifically -281. It comes in a sleek black color and does not have any coating. With a weight of 0.1 lbs and dimensions of 15.24 cm in length, 12.7 cm in width, and 2.54 cm in depth, it is compact and easy to handle.