40671 Coarse 5/8 Nylon Insert Lock Box/25

Overview The 40671 Coarse 5/8 Nylon Insert Lock Nut (03655) is designed for fastening applications requiring resistance to loosening under vibrations and torque. Supplied by Midwest Fastener, this product is sold in a box of 25 units, offering a practical bulk quantity for professional and trade use. Specification Detail MPN 03655 Brand Midwest Fastener Thread Type Coarse Size 5/8 Insert Type Nylon Insert Color Gray Package Quantity 25 per box Package Weight 3.91 lb Package Dimensions 4.52 x 3.22 x 2.05 in Technical Features Nylon insert locking mechanism: The embedded nylon collar grips the bolt threads when tightened, resisting loosening caused by vibration and applied torque without the need for additional locking hardware. Coarse thread profile: Coarse threading allows for faster installation and greater resistance to cross-threading, reducing assembly time in high-volume fastening tasks. 5/8 sizing: Matches standard 5/8 coarse-thread bolt specifications, ensuring broad compatibility across common structural and mechanical assemblies. Box quantity of 25: Bulk packaging reduces per-unit cost and ensures sufficient supply for multi-point fastening jobs without repeated reordering. Applications Structural assemblies subject to continuous vibration, such as machinery mounts and equipment frames. General construction and fabrication where fastener loosening under dynamic loads is a concern. Mechanical and industrial maintenance requiring reliable, reusable thread-locking fasteners. Any application calling for a standard 5/8 coarse-thread nut with integrated locking capability.