All Metal Locknuts

Types of All Metal Locknuts We Offer

Serrated Flange Hex Locknut, Case Hardened, Zinc CR+3

These locknuts feature serrations on the flange to grip the surface and resist loosening. The case-hardened design increases wear resistance, while the zinc clear finish offers corrosion protection. They are commonly used in machinery, automotive applications, and assemblies subject to vibration.

External Tooth K Lock Hex Locknut, Zinc CR+3

These locknuts have external teeth that bite into the mating surface, creating a secure hold. The zinc clear finish resists corrosion, making them ideal for equipment and electrical assemblies. Their design eliminates the need for washers while providing strong locking action.

Grade C Hex All Metal Cone Locknut, Zinc CR+3 & Wax

These Grade C cone locknuts rely on their conical shape to create friction against the bolt threads. With zinc clear plating and wax lubrication, they offer corrosion resistance and easier installation. They are suited for structural steelwork, construction, and heavy machinery.

Grade G Hex Flange Cone Locknut Without Serration, 2 Opposite Oval Lock, Phos & Oil

These flange cone locknuts use a two-point oval deformation for locking rather than serrations. The phosphate and oil finish provides lubricity and mild corrosion protection. They are often applied in machinery, automotive equipment, and assemblies requiring smooth bearing surfaces.

Grade A Reversible Hex Locknut, Zinc CR+3

Reversible locknuts can be installed in either orientation, making assembly faster and easier. The zinc clear finish provides corrosion resistance while maintaining strength. They are used in automotive, light construction, and equipment where time efficiency and reliability matter.

Flexloc, Full Height Locknut, Plain

Flexloc locknuts rely on slotted ends that flex to grip the bolt threads. The plain finish makes them cost-effective for indoor use or protected assemblies. They are commonly used in manufacturing, automotive, and general industrial applications.

Flexloc, Full Height Locknut, Cadmium

These Flexloc locknuts use cadmium plating for enhanced corrosion resistance and lubricity. They are widely applied in aerospace, defense, and high-performance equipment where both durability and smooth installation are critical.

Metric Class 8 All Metal Locknut, DIN 980 V, Zinc CR+3 & Wax

These metric locknuts meet DIN 980 V standards for Class 8 strength. The zinc clear finish and wax coating provide corrosion resistance and reduce friction during tightening. They are widely used in European construction, machinery, and automotive assemblies.

Metric Class 8 All Metal Locknut, DIN 980 V, Zinc Yellow CR+6 & Wax

These nuts provide the same Class 8 performance with a zinc yellow finish for added visibility. The wax coating improves installation, making them suitable for equipment manufacturing and construction projects where both identification and durability are important.

Metric Class 10 All Metal Locknut, DIN 980 V, Zinc CR+3 & Wax

These Class 10 locknuts deliver maximum strength for demanding assemblies. The zinc clear coating and wax lubrication provide protection and ease of installation. They are trusted in heavy machinery, steel structures, and industrial projects.

Metric Class 10 All Metal Locknut, DIN 980 V, Zinc Yellow CR+6 & Wax

These Class 10 nuts combine top-tier strength with a zinc yellow finish for visibility. The wax improves installation efficiency, while the locking design ensures security under vibration. They are applied in international infrastructure and machinery.

Metric Class 10 Hex Flange Top Locknut, DIN 6927/DIN EN 1664, Plain

These flange locknuts meet DIN 6927 and DIN EN 1664 standards. The plain finish is best for controlled environments or indoor assemblies. They provide reliable locking action for machinery and structural applications where washers are not used.

Metric Class 10 Hex Flange Metal Top Locknut, DIN 6927/DIN EN 1664, Zinc CR+3

These flange top locknuts feature zinc clear plating for corrosion protection. They are widely used in construction, industrial machinery, and European automotive systems. Their integrated flange provides even load distribution and eliminates the need for separate washers.

Metric Class 8 External Tooth K Lock Hex Locknut, Zinc CR+3

These nuts feature external teeth that dig into the mating surface for a secure hold. The zinc clear coating provides corrosion resistance, making them suitable for electrical, mechanical, and machinery applications. Their locking design ensures reliable performance under vibration.

Metric Class 8 Prevailing Torque Hex Flange Locknut, DIN 6927/DIN EN 1664, Zinc CR+3

These prevailing torque locknuts use mechanical deformation to resist loosening. The zinc clear finish provides environmental protection, making them useful in transportation, construction, and industrial equipment. The flange distributes load across the surface for added security.

Material Options

South Coast Fasteners stocks all metal locknuts in materials designed for strength, toughness, and performance in high-vibration or high-temperature environments.

Case Hardened Steel

Case hardened steel provides excellent wear resistance, making it ideal for serrated and toothed locknuts that rely on surface engagement. These nuts are used in machinery, automotive systems, and assemblies where durability is critical.

Medium Carbon Steel (Grades A and C)

Medium carbon steel delivers strength and toughness for structural and industrial fastening. These grades are heat-treated for added performance and are used in construction, equipment, and heavy machinery.

Alloy and Specialty Steels (Grades G, Metric Classes 8 and 10)

These materials are engineered for maximum performance in demanding applications. Alloy steels are used in aerospace, industrial plants, and infrastructure where heavy vibration and high temperatures are common.

Flexloc Design with Deformation Steel

Flexloc locknuts are made from steel designed to flex and deform under load. This provides locking power without additional inserts, making them effective in dynamic applications across multiple industries.

Available Finishes

South Coast Fasteners offers all metal locknuts in finishes that enhance durability, extend service life, and improve ease of installation.

Plain

Plain finishes are cost-effective and suitable for indoor or controlled conditions. They are common in machinery, assembly plants, and protected environments.

Phosphate and Oil

This treatment improves lubricity and offers mild corrosion resistance. It is widely used in automotive, machinery, and industrial equipment where smooth installation is valuable.

Zinc Clear CR+3

Zinc clear plating provides corrosion resistance and a clean metallic look. It is a standard finish in automotive, equipment, and construction assemblies.

Zinc Yellow CR+6

This finish offers corrosion protection with added visibility for inspection. It is useful in construction, electrical systems, and projects requiring frequent quality checks.

Wax and Lubricated Coatings

Wax reduces friction and aids installation, making it easier to tighten locknuts in field conditions. These coatings are especially useful in heavy structural projects and machinery assembly.

Cadmium

Cadmium plating provides excellent corrosion resistance and lubricity. It is often specified in aerospace, defense, and high-performance equipment due to its protective qualities.

Why Choose South Coast Fasteners?

South Coast Fasteners provides all metal locknuts engineered to perform in demanding environments. By offering a wide range of grades, designs, and finishes, we help customers find fasteners that resist loosening under vibration, load, and temperature extremes. With dependable inventory and practical expertise, our locknuts give customers confidence in every connection.

Order All Metal Locknuts Online Today

Order all metal locknuts online today with South Coast Fasteners and get the size, grade, and finish you need delivered quickly. From structural applications to machinery and equipment, our inventory ensures your fastening requirements are met without delays.