7003903102 is a stainless steel jam nut made by Sealcon. It is a Metric size M6 hex nut, with a 6H thread. It is a jam nut, which means it has an internal thread and an external thread, and is designed for use in low-torque applications, such as clamping cables together in electrical and automation applications. The stainless steel construction makes it corrosion-resistant.