Metric Flat Socket Cap Screws

South Coast Fasteners, Inc. supplies metric flat socket cap screws engineered for applications that require a low-profile fastening solution. Manufactured to DIN 7991 standards, these screws feature a countersunk head that sits flush with the surface, providing strength while maintaining a smooth finish. They are widely used in machinery, automotive, aerospace, and structural assemblies where clearance is tight and performance is critical. South Coast Fasteners offers metric flat socket cap screws in multiple material grades and finishes, ensuring long-lasting reliability across industries..

Your Supplier for High-Performance Industrial Fasteners

If you're looking for a trusted supplier of wholesale industrial fasteners, South Coast Fasteners is your solution. Contact our Anaheim, CA office to learn more about our product options and how we can support your project needs. For helpful service, fast order turnaround, and high-quality fasteners in bulk or small batches, choose South Coast Fasteners.

Types of Metric Flat Socket Cap Screws We Offer

Metric Class 12.9 Flat Socket Cap Screw, DIN 7991, Thermal Black Oxide

These Class 12.9 screws deliver maximum strength with a countersunk design for flush fastening. The thermal black oxide finish provides a smooth dark appearance and mild resistance to corrosion. They are chosen for heavy-duty equipment, aerospace, and machinery applications where safety and strength are critical.

Metric Class 12.9 Flat Socket Cap Screw, DIN 7991, Zinc CR+3 Bake

Built from Class 12.9 alloy steel, these screws feature a zinc CR+3 baked finish for enhanced corrosion protection. The baking process reduces hydrogen embrittlement, making them reliable in structural and safety-critical joints. Their bright silver finish also provides a professional appearance in visible applications.

Metric Class 12.9 Flat Socket Cap Screw, DIN 7991, Zinc CR+6

This version provides the same extreme strength as other Class 12.9 screws but with a zinc CR+6 finish for added durability. The finish gives a unique tone that stands out in specialized engineering and construction projects. These fasteners are selected when both long-term resistance and appearance are priorities.

Metric Class 12.9 Flat Socket Cap Screw, DIN 7991, Mechanical Zinc CR+3

With a mechanical zinc CR+3 coating, these screws avoid hydrogen embrittlement while still delivering strong corrosion resistance. They are often used in aerospace, machinery, and heavy equipment where high strength and safety are required. Their coating ensures long service life and reliability under stress.

Metric Class 10.9 Flat Socket Cap Screw, DIN 7991, Thermal Black Oxide

Class 10.9 screws provide dependable tensile performance at a more economical level than Class 12.9. The thermal black oxide finish offers a sleek dark look with mild corrosion resistance. They are commonly applied in automotive, construction, and machinery builds where balanced performance is needed.

Metric Class 10.9 Flat Socket Cap Screw, DIN 7991, Zinc CR+3 Bake

These screws combine the strength of Class 10.9 with a baked zinc CR+3 finish for added protection. The baking process reduces embrittlement risks, ensuring durability in demanding mechanical and industrial assemblies. Their bright finish also provides clean aesthetics in visible uses.

Metric Stainless A2 Flat Socket Cap Screw, DIN 7991

A2 stainless steel screws offer moderate strength with reliable resistance to moisture and mild chemicals. They are frequently used in marine, architectural, and outdoor assemblies where corrosion resistance is required. Their flush design allows for neat installations while preventing rust in exposed environments.

Metric Stainless 316 Flat Socket Cap Screw, DIN 7991

316 stainless steel provides superior protection against saltwater and harsh chemicals, making these screws indispensable in marine and offshore projects. Their countersunk head design ensures a smooth finish even in tight-clearance applications. They deliver consistent performance and longevity in the toughest environments.

Material Options

South Coast Fasteners stocks metric flat socket cap screws in the following material grades, each chosen for specific performance needs across industries.

Alloy Steel Class 12.9

Class 12.9 alloy steel provides maximum tensile strength, making it suitable for the most demanding equipment and structural applications. These screws withstand heavy loads, vibration, and stress cycles without failure. They are trusted in aerospace, heavy machinery, and other safety-critical projects.

Alloy Steel Class 10.9

Class 10.9 alloy steel balances high strength with cost-effectiveness. These screws are widely used in automotive and machinery applications where reliability is needed but extreme strength is not required. Their versatility makes them a practical choice for industrial and construction use.

Stainless Steel A2

A2 stainless steel offers dependable corrosion resistance along with solid mechanical performance. It is often used in outdoor, marine, and food-grade environments where rust resistance is vital. These screws maintain appearance and function even under exposure to moisture.

Stainless Steel 316

316 stainless steel provides the highest corrosion resistance of the available grades, protecting against chlorides and aggressive chemicals. These screws are used in chemical plants, offshore platforms, and marine installations. They ensure long-term durability and structural integrity in the harshest conditions.

Available Finishes

South Coast Fasteners offers metric flat socket cap screws in a curated range of finishes designed to extend service life and meet industry needs.

Thermal Black Oxide

Thermal black oxide provides a smooth dark surface with mild corrosion resistance. It also retains oil well, adding lubricity and improving wear resistance. This finish is often used in tools, machinery, and assemblies where appearance and protection both matter.

Zinc CR+3 Bake

Zinc CR+3 bake delivers a bright silver finish with strong resistance to corrosion. The baking process minimizes hydrogen embrittlement, making it particularly effective for structural and safety-critical uses. It is common in mechanical and industrial applications.

Zinc CR+6

Zinc CR+6 provides enhanced protection and a distinct finish tone compared to CR+3. These screws are chosen for assemblies that require both performance and a consistent appearance. The finish is widely used in manufacturing and construction projects.

Mechanical Zinc CR+3

Mechanical zinc CR+3 avoids hydrogen embrittlement by using a non-electrolytic process. This makes it ideal for high-strength screws such as Class 12.9. It is frequently specified in aerospace, defense, and heavy machinery where safety is non-negotiable.

Why Choose South Coast Fasteners?

South Coast Fasteners is dedicated to supplying fasteners that combine strength, consistency, and support. With decades of experience and a reputation for reliability, we help industries from automotive to aerospace find the right solutions. Customers trust us because we provide high-quality products, dependable supply, and the expertise needed to keep projects moving.

Order Metric Flat Socket Cap Screws Online Today

Order metric flat socket cap screws from South Coast Fasteners with the assurance that stock is always available. Our straightforward process makes it simple to choose the correct grade, material, and finish. Whether for bulk orders in construction or specialized needs in marine and aerospace, we deliver quickly with expert support.