Stainless Steel Locknuts

South Coast Fasteners, Inc. supplies stainless steel locknuts designed to resist loosening in assemblies exposed to vibration, load, and environmental stress. These nuts use mechanical deformation, nylon inserts, serrated flanges, or flexing designs to maintain secure connections without relying on adhesives. South Coast Fasteners offers stainless steel locknuts across multiple designs, grades, and metric standards to meet the needs of industries including construction, marine, automotive, and chemical processing.

Get Superior-Quality Fasteners at Competitive Prices

Use the options below to find the fasteners you need in the quantities required for your application. Questions? Contact us today, and our team will gladly assist you in finding the best fastening solutions for your requirements. With South Coast Fasteners, you can count on helpful support, competitive pricing, and top-quality products for all your fastener requirements.

Types of Stainless Steel Locknuts We Offer

Stainless Steel 18-8 Nylon Insert Locknut

These locknuts combine the corrosion resistance of stainless steel 18-8 with a nylon insert that grips threads securely. They are ideal for automotive, construction, and machinery applications where vibration could cause fasteners to loosen. The nylon insert ensures consistent locking performance under repeated use.

Stainless Steel 316 Nylon Insert Locknut

Made from stainless steel 316, these nylon insert locknuts provide superior resistance to saltwater and harsh chemicals. They are widely used in marine, offshore, and chemical environments where both corrosion protection and vibration resistance are required. Their durability makes them essential in critical applications.

Stainless Steel 18-8 Hex Flange Nut Serrated

These serrated flange locknuts feature a built-in flange with serrations that grip the mating surface. Made from stainless steel 18-8, they resist corrosion while providing strong vibration resistance. They are commonly used in equipment, machinery, and construction projects where washers are not required.

Stainless Steel 316 Hex Flange Nut Serrated

These flange locknuts are manufactured from stainless steel 316 and include serrations for locking power. Their superior corrosion resistance makes them suitable for marine, coastal, and chemical processing assemblies. The flange spreads load while the serrations prevent loosening.

Stainless Steel 18-8 External Tooth K Lock Hex Locknut

These nuts use external teeth that bite into the surface to prevent loosening. Manufactured from stainless steel 18-8, they provide corrosion resistance and mechanical locking power without the need for separate washers. They are widely used in electrical, machinery, and automotive assemblies.

Stainless Steel 18-8 Flexloc Full Height Locknut

Flexloc locknuts rely on slotted ends that flex as the nut is tightened, gripping the threads securely. Made from stainless steel 18-8, they resist corrosion and maintain strength in vibration-heavy environments. They are commonly applied in industrial machinery, equipment, and transportation assemblies.

Stainless Steel A2 70 Nylon Insert Thin Locknut DIN 985

These thin-profile locknuts are made from stainless steel A2 with Class 70 strength and comply with DIN 985. Their nylon insert provides vibration resistance in lighter assemblies such as machinery, construction, and equipment. Their slim design makes them practical for tight spaces.

Stainless Steel A4 70 Nylon Insert Thin Locknut DIN 985

Made from stainless steel A4 with Class 70 strength, these locknuts offer superior corrosion resistance compared to A2. Their nylon insert locks securely under vibration, making them valuable in marine and outdoor environments. They comply with DIN 985 for metric applications.

Stainless Steel A4 80 Nylon Insert Thin Locknut DIN 985

These thin-profile locknuts are produced from stainless steel A4 with Class 80 strength, providing greater tensile capacity. They are used in demanding structural and marine assemblies where nylon inserts must perform under load. DIN 985 compliance ensures consistent performance.

Stainless Steel A2 18-8 Nylon Flange Locknut Non Serrated DIN 6926

These flange locknuts are made from stainless steel A2 18-8 and feature a nylon insert for vibration resistance. Non-serrated designs protect delicate surfaces from scoring. DIN 6926 compliance ensures accuracy and performance in metric equipment and assemblies.

Stainless Steel A2 18-8 Hex Serrated Flange Locknut DIN 6923

These serrated flange locknuts are manufactured from stainless steel A2 18-8 to DIN 6923 standards. The serrations bite into the surface to prevent loosening while the flange distributes load. They are used in machinery, equipment, and construction assemblies requiring corrosion resistance.

Stainless Steel A4 316 Hex Serrated Flange Locknut DIN 6923

Made from stainless steel A4 316, these locknuts provide maximum corrosion resistance for outdoor, marine, and chemical projects. The serrated flange grips tightly under vibration, eliminating the need for separate washers. They meet DIN 6923 specifications for metric assemblies.

Stainless Steel A2 18-8 Hex Non Serrated Flange Nut DIN 6923

These flange nuts are produced from stainless steel A2 18-8 without serrations, preventing surface damage during fastening. They provide strong, reliable performance in machinery, construction, and assemblies where a smooth flange is required. DIN 6923 ensures metric compatibility.

Stainless Steel A2 70 External Tooth K Lock Hex Locknut

These locknuts are made from stainless steel A2 70 and use external teeth for strong locking action. The teeth grip the mating surface securely, preventing loosening in vibration-heavy applications. They are suited for machinery, automotive, and metric construction projects.

Material Options

South Coast Fasteners stocks stainless steel locknuts in multiple grades to match application needs.

Stainless Steel 18-8

Stainless steel 18-8 offers reliable corrosion resistance and strength, making it a versatile choice for machinery, equipment, and general construction. It performs well in environments with moderate exposure to moisture.

Stainless Steel 316

Stainless steel 316 provides superior resistance to saltwater and chemicals, making it the top choice for marine and chemical processing applications. It ensures long-term performance in extreme environments.

Stainless Steel A2 and A4

A2 and A4 are metric stainless steel grades used in European and international assemblies. A2 provides dependable resistance for general projects, while A4 offers enhanced durability for marine and chemical applications.

Why Choose South Coast Fasteners?

South Coast Fasteners supplies stainless steel locknuts designed for environments where vibration, stress, and corrosion are challenges. With multiple grades, designs, and international standards available, we provide fasteners that deliver reliable locking power and long service life. Customers trust us for consistency, expertise, and a stocked inventory.

Order Stainless Steel Locknuts Online Today

Order stainless steel locknuts online today with South Coast Fasteners and get the grade, type, and standard you need delivered quickly. Whether for marine, structural, or machinery applications, our inventory ensures your projects remain secure and supported with dependable fastening solutions.