Buy Flat Socket Cap Screws Online at South Coast Fasteners
Buy flat socket cap screws online from South Coast Fasteners, Inc., and get hardware that ships out quickly so your workflow keeps moving without unexpected delays. These screws are built for tight installs, clean surfaces, and applications where a flush finish is essential. With a countersunk head and an internal hex drive, flat socket cap screws sit level with the material and give you steady torque control during assembly.
Flat socket cap screws are used across construction, manufacturing, automotive, aerospace, fabrication, electronics, and maintenance industries. This product selection includes the sizes, materials, and finishes needed for equipment builds, precision fixtures, structural panels, and machinery assembly. Everything is stocked for simple online ordering so you can cut downtime, stay organized, and keep every project on track.
Trust South Coast Fasteners for Durable Hardware That Performs on Every Job Site
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 Flat Socket Cap Screws
Flat Socket Cap Screw, Thermal Black Oxide, Alloy
This flat socket cap screw is crafted from durable alloy steel and treated with a thermal black oxide finish for superior corrosion resistance. The flat head design allows for a flush fit in countersunk holes, creating a smooth, low-profile surface. It’s commonly used in precision machinery, aerospace components, and tooling where both strength and a clean finish are essential.
Flat Socket Cap Screw, Zinc CR+3 Bake, Alloy
Featuring a CR+3 zinc bake coating, this screw offers excellent rust protection and a bright metallic appearance. The baked zinc layer enhances coating adhesion and durability under mechanical stress. It’s ideal for use in automotive assemblies, heavy-duty machinery, and structural frameworks exposed to moisture or wear.
Flat Socket Cap Screw, Mechanical Zinc CR+3, Alloy
This screw uses a mechanically applied CR+3 zinc finish to ensure even coverage and minimize hydrogen embrittlement. The flat head design offers an aesthetic, flush-mounted fit in assembled parts. It’s often chosen for electronic enclosures, industrial equipment, and applications requiring high reliability under load.
Flat Socket Cap Screw, Nylon Patch, Thermal Black Oxide, Alloy
Designed with a pre-applied nylon patch, this flat socket screw provides self-locking resistance to vibration and loosening. The thermal black oxide coating enhances both corrosion protection and uniform torque performance. It’s ideal for use in robotics, automotive components, and high-speed machinery.
Flat Socket Cap Screw, Nylon Pellet, Black Alloy
This black alloy flat socket cap screw incorporates a nylon pellet insert that delivers superior anti-vibration and reusability benefits. The black finish enhances corrosion resistance while maintaining a refined appearance. Commonly used in aerospace hardware, equipment housings, and assembly lines where precision and longevity matter.
Flat Socket Cap Screw, Tamper Resistant, Thermal Black Oxide, Alloy
Featuring a tamper-resistant drive style, this screw prevents unauthorized removal while maintaining a strong, durable fastening. The thermal black oxide coating protects against corrosion and wear. It’s widely used in security panels, transportation systems, and defense manufacturing where component integrity is vital.
Stainless 18-8 Flat Socket Cap Screw
Manufactured from 18-8 stainless steel, this screw provides excellent corrosion resistance and long-term strength. The flat head ensures a flush surface finish, making it ideal for applications requiring a smooth exterior. Frequently used in marine, medical, and food-grade industries due to its non-corrosive properties and hygienic finish.
Stainless 316 Flat Socket Cap Screw
Constructed from 316 stainless steel, this flat socket cap screw delivers maximum resistance to corrosion, particularly in saline and chemical environments. Its flat head offers a sleek, countersunk finish for clean assemblies. This fastener is preferred in marine engineering, laboratory equipment, and coastal construction.
Stainless 18-8 Flat Socket Cap Screw, Tamper Resistant
This tamper-resistant flat socket screw made from 18-8 stainless steel combines strength with added security. Its corrosion resistance makes it ideal for outdoor and high-moisture environments. Commonly installed in public infrastructure, electronic casings, and industrial control systems where access restriction is critical.
Flat Socket Cap Screws - Material Options
Choose flat socket cap screws made from reliable, high-performing materials engineered for strength, durability, and corrosion resistance.
Alloy Steel – Grade 10.9
A strong, heat-treated steel ideal for high-load applications with moderate wear. Grade 10.9 offers a solid balance of strength and toughness, commonly used in structural bolting and machinery assembly where performance under stress matters.
Alloy Steel – Grade 12.9
Engineered for maximum tensile strength and torque resistance. Grade 12.9 is one of the highest strength grades available in alloy steel and is ideal for extreme load-bearing applications including automotive suspension components, heavy machinery, and critical infrastructure projects.
Stainless Steel 18-8 (304)
Offers excellent corrosion resistance and a clean, professional look. This grade is one of the most versatile stainless options, widely used in marine, food-grade, and outdoor applications where appearance and corrosion protection go hand-in-hand.
Flat Socket Cap Screws - Available Finishes
Choose the right finish to meet the demands of your job. Each finish offers a balance of durability, corrosion resistance, and visual appeal. Let us help you pick the one that fits your environment and spec.
Thermal Black Oxide
A heat-treated surface treatment that produces a dark black finish and mild corrosion resistance. Common in indoor or low-moisture environments, black oxide also reduces light reflection and adds a sleek appearance.
Zinc Bake Cr+3
This finish involves an electroplated zinc coating followed by a baking process that enhances adhesion and surface hardness. It’s great for fasteners needing added durability in slightly corrosive environments.
Zinc Cr+3
A corrosion-resistant finish that provides a clean, silvery look and protection for indoor or mild outdoor conditions. It’s a cost-effective solution for general-purpose fasteners requiring basic rust prevention.
Why Choose South Coast Fasteners?
At South Coast Fasteners, we focus on quality, precision, and availability. Our team understands the small details that make a big difference, from proper head sizing to material compatibility and finish specifications. Whether you need a few specialty screws or a bulk order for your next production run, we’re here to make sure you get the right product, fast.
Shop Flat Socket Cap Screws Online at South Coast Fasteners
Ready to get started? Browse our full online inventory and place your order with confidence. If you need help selecting materials, finishes, or fitment, contact our team. We’ll make sure you get exactly what you need to keep your project on track.