Marine Fasteners RP-1514 5/16-18 Brass Nylon Insert Lock Nut 100-Pack

The Marine Fasteners RP-1514 is a bulk 100-piece pack of 5/16"-18 UNC brass nylon insert lock nuts, also known as Nylock nuts or nylon lock nuts. Constructed from solid brass, these hex-pattern nuts deliver excellent corrosion resistance and conductivity, making them a dependable choice for marine, electrical, and general hardware applications where moisture and vibration are concerns.

Key Features:

• Thread Size: 5/16"-18 UNC (Unified National Coarse)
• Material: Solid brass — corrosion-resistant copper-zinc alloy
• Locking Mechanism: Nylon insert at the top of the nut applies radial compressive force against mating threads to resist loosening from vibration
• Width Across Flats: 1/2"
• Nut Style: Hex (six-sided)
• Pack Quantity: 100 pieces
• Right-hand thread

The nylon insert deforms elastically over the bolt threads without cutting into them, creating a secure friction-based lock that keeps the nut in place under vibration and dynamic loads. Brass construction is well-suited for use alongside bronze or brass fittings and hardware, minimizing galvanic compatibility concerns. This bulk 100-pack is ideal for boatbuilding, dock hardware, marine electrical panels, and other marine maintenance or fabrication projects.