Metric Button Socket Cap Screws

South Coast Fasteners, Inc. supplies metric button socket cap screws manufactured to ISO 7380 standards for strength, precision, and versatility. With a rounded, low-profile head and internal hex drive, button socket screws provide secure fastening while maintaining a smooth surface finish. They are widely used in machinery, automotive, construction, and architectural projects where both strength and appearance matter. South Coast Fasteners offers metric button socket cap screws in multiple classes, stainless grades, and finishes to cover a full range of applications.

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Use the options below to order top-quality fasteners in the sizes and specifications you need. Questions about our fastener options? Contact our office in Anaheim, CA today, and our team will be happy to assist you. Whether you need repeat bulk orders or one-off small batch purchases, South Coast Fasteners has you covered for all your industrial fastener supplies.

Types of Metric Button Socket Cap Screws We Offer

Metric Class 12.9 Button Socket Screw, ISO 7380, Thermal Black Oxide

These Class 12.9 screws combine maximum tensile strength with a low-profile rounded head. The thermal black oxide finish adds a uniform dark surface with mild corrosion resistance. They are ideal for heavy-duty equipment, aerospace, and machinery where both durability and clean fit are required.

Metric Class 12.9 Button Socket Screw, ISO 7380, Zinc CR+3 Bake

This version delivers Class 12.9 strength along with a zinc CR+3 baked finish for added corrosion resistance. The baking process reduces hydrogen embrittlement, making them a safe choice for structural and safety-critical assemblies. Their silver finish also provides a polished look for visible applications.

Metric Class 12.9 Button Socket Screw, ISO 7380, Mechanical Zinc CR+3

With mechanical zinc CR+3 plating, these screws avoid hydrogen embrittlement while maintaining corrosion protection. They are frequently chosen in aerospace and heavy machinery where high strength and long service life are critical. Their coating ensures fasteners remain secure under vibration and repeated load cycles.

Metric Class 10.9 Button Socket Screw, ISO 7380, Thermal Black Oxide

Class 10.9 screws provide strong tensile capacity while remaining more economical than Class 12.9. Finished in thermal black oxide, they offer a dark, professional appearance and mild resistance to corrosion. They are commonly used in automotive and construction projects requiring dependable fastening.

Metric Class 10.9 Button Socket Screw, ISO 7380, Zinc CR+3 Bake

These screws combine the durability of Class 10.9 alloy steel with a zinc CR+3 baked finish. The process improves corrosion resistance and reduces embrittlement risks, ensuring reliable fastening in mechanical and structural assemblies. Their bright coating makes them suitable for exposed installations.

Metric Class 10.9 Button Flange Socket Screw, ISO 7380, Thermal Black Oxide

Featuring an integrated flange, these Class 10.9 screws distribute load more evenly while maintaining secure fastening. The thermal black oxide coating delivers a dark, uniform finish with mild corrosion protection. They are widely used in automotive and machinery builds where added stability is valuable.

Metric Stainless A2 Button Socket Screw, ISO 7380

A2 stainless steel button socket screws provide moderate strength and corrosion resistance. Their rounded heads give a clean, low-profile finish suitable for architectural and marine applications. These screws are selected where moisture exposure or light chemical resistance is needed.

Metric Stainless 316 Button Socket Screw, ISO 7380

316 stainless steel screws offer superior resistance to saltwater and harsh chemicals. They are essential in marine, chemical, and offshore projects where conditions are highly corrosive. Their smooth, rounded design ensures both function and appearance in demanding environments.

Metric Stainless A2 Button Flange Socket Screw, ISO 7380

These A2 stainless flange screws provide dependable corrosion resistance with additional load-bearing support. The flange distributes pressure across the surface, making them effective in marine and construction projects. They offer a neat finish while protecting against rust in exposed conditions.

Material Options

South Coast Fasteners stocks metric button socket cap screws in the following material grades, each designed for specific performance needs.

Alloy Steel Class 12.9

Class 12.9 alloy steel delivers maximum tensile strength, making it ideal for aerospace, heavy machinery, and structural uses. These screws withstand heavy loads and vibration while maintaining reliable performance. They are the strongest option for demanding applications.

Alloy Steel Class 10.9

Class 10.9 alloy steel balances strength with economy, providing excellent performance for automotive and machinery assemblies. It is commonly specified where reliability is critical but extreme strength is not required. These screws are versatile across multiple industries.

Stainless Steel A2

A2 stainless steel combines dependable corrosion resistance with solid mechanical strength. It is frequently used in marine, architectural, and outdoor environments where rust resistance is important. These screws maintain both durability and appearance under exposure to moisture.

Stainless Steel 316

316 stainless steel provides the highest corrosion resistance, protecting against saltwater, chlorides, and aggressive chemicals. These screws are indispensable in offshore and chemical applications where exposure is constant. They ensure assemblies remain secure and free from corrosion over long service life.

Available Finishes

South Coast Fasteners offers metric button socket cap screws in a range of finishes designed to improve durability and suit application requirements.

Thermal Black Oxide

Thermal black oxide creates a smooth dark surface that resists wear and reduces glare. It offers mild protection against corrosion while retaining oil for added lubricity. This finish is valued in machinery and equipment where function and appearance are both important.

Zinc CR+3 Bake

Zinc CR+3 bake provides a bright silver finish with strong corrosion resistance. The baking process minimizes hydrogen embrittlement, making it well-suited for high-strength fasteners. It is frequently used in structural and industrial assemblies.

Mechanical Zinc CR+3

Mechanical zinc CR+3 plating applies protection without the risks associated with electroplating. It avoids hydrogen embrittlement, making it particularly effective for high-strength Class 12.9 screws. Industries such as aerospace and heavy machinery rely on this finish for long-term safety and durability.

Why Choose South Coast Fasteners?

South Coast Fasteners supplies button socket cap screws that meet strict industry standards for strength, reliability, and performance. With decades of experience and a strong commitment to quality, we provide customers with dependable products and expert support. Our consistent supply and knowledgeable service make us a trusted partner across industries.

Order Metric Button Socket Cap Screws Online Today

Order metric button socket cap screws from South Coast Fasteners with confidence knowing stock is always available. Our ordering process is simple and efficient, helping you select the right grade, material, and finish. Whether for bulk industrial needs or specialized marine and aerospace projects, we deliver fast with dependable support.