The LD-393 carbon steel nut series provides a comprehensive range of metric hex nuts and nylon insert lock nuts for general fastening and anti-vibration applications. Covering thread sizes from M3 to M24, the series includes standard hex nuts to DIN 934 / ISO 4032, nylon insert lock nuts (nylock) to DIN 985, and thin jam nuts for limited-clearance assemblies. This breadth allows buyers to source a complete nut program from a single supplier, ensuring consistent finish, dimensional accuracy, and thread fit across an entire bill of materials.

The nylon insert lock nut is the centerpiece for vibration resistance. A permanently fitted nylon ring sits in the top of the nut, and when the nut is threaded onto a bolt, the bolt threads cut into the nylon to create friction. This prevailing torque resists loosening from vibration and dynamic loads far more effectively than a plain hex nut, making nylock nuts the standard choice for automotive, machinery, and equipment assemblies subject to movement. While nylock nuts can be reused a limited number of times, the nylon gradually loses grip, so for critical or high-vibration joints single use is recommended.

Dimensional accuracy and material quality are governed by recognized standards throughout the series. Standard hex nuts are produced to DIN 934 / ISO 4032 with controlled width across flats and thread tolerances of 6H, while nylon insert lock nuts conform to DIN 985 with a one-piece, all-metal-plus-nylon construction. The nuts are manufactured from carbon steel in Grade 6 or Grade 8, delivering the proof load needed for structural and mechanical joints. Zinc plating in white/blue or yellow finishes provides corrosion resistance for indoor and covered outdoor service, and a stainless steel option is available for food, marine, and outdoor environments where rust prevention is critical.

For wholesale buyers and OEM accounts, the LD-393 series supports flexible customization and packaging. OEM sizes and grades, custom plating, stainless steel variants, wing nut and flange nut options, private-label branding, and custom retail packaging can all be supplied. With a minimum order quantity of 5000 pieces, mixed orders across sizes and types supported, and a production lead time of 7 to 15 days, the series offers importers, assemblers, and distributors a dependable, standards-compliant source of carbon steel hex nuts and nylon insert lock nuts at competitive wholesale pricing.