Coarse 5/16 Nylon Insert Lock Box/100

Overview The MIDWEST FASTENER Coarse 5/16 Nylon Insert Lock Nut (3650) is designed for fastening and vibration-resistant hardware applications requiring a secure, re-usable threaded connection. Specification Detail MPN 3650 Brand Midwest Fastener Thread Type Coarse Thread Size 5/16 Materials Zinc (body), Nylon (insert) Package Quantity Box of 100 Package Weight 3.91 lb Package Dimensions 10.05 in x 2.54 in x 3.36 in Color Gray Technical Features Nylon insert locking mechanism: The integrated nylon collar deforms around the bolt threads upon installation, creating friction-based resistance to loosening — maintaining clamp load under vibration and dynamic loads without the need for secondary locking hardware. Zinc-plated steel body: Zinc plating provides a baseline level of corrosion resistance, making these nuts suitable for general indoor and sheltered outdoor fastening applications. Coarse thread (5/16): Coarse thread profiles allow for faster engagement and installation compared to fine thread equivalents, and are more tolerant of minor thread damage or contamination on mating fasteners. Box of 100 units: Bulk packaging reduces per-unit cost and ensures an adequate on-hand supply for production, assembly, or maintenance tasks where repeated use is required. Applications General mechanical assemblies requiring vibration-resistant fastening Structural and fabrication work where coarse 5/16 threaded fasteners are specified Maintenance and repair operations (MRO) stock for workshops and job sites Light-duty equipment assembly in sheltered or indoor environments