Buy Socket Head Cap Screws Online at South Coast Fasteners

Types of Socket Head Cap Screws 

Socket Cap Screw, Thermal Black Oxide, Alloy

This high-strength alloy socket cap screw features a thermal black oxide finish that enhances corrosion Resistant and reduces glare. The coating also provides a smooth, uniform appearance ideal for precision assemblies. Commonly used in automotive, aerospace, and machinery applications where durability and clean aesthetics are critical.

Socket Cap Screw, 1936 Series, Thermal Black Oxide, Alloy

The 1936 Series socket cap screw combines strength and heat-treated durability with a reliable black oxide finish. Its consistent surface finish helps minimize friction during assembly and ensures long-term corrosion protection. Frequently specified in heavy machinery, tooling, and industrial manufacturing settings.

Socket Cap Screw, Zinc CR+3 Bake, Alloy

This screw features a CR+3 zinc bake coating that provides strong protection against rust and chemical corrosion. The baked finish ensures better adhesion and longer-lasting performance than traditional plating. It’s widely used in construction, power equipment, and mechanical assemblies where exposure to moisture is expected.

Socket Cap Screw, Mechanical Zinc CR+3, Alloy

Mechanically plated with CR+3 zinc, this alloy screw delivers a uniform finish that reduces hydrogen embrittlement risk. It’s an ideal choice for assemblies sensitive to high-stress environments or where plating integrity is crucial. Commonly found in automotive manufacturing, electrical enclosures, and precision instruments.

Socket Cap Screw, Zinc Yellow CR+6

With its bright yellow CR+6 zinc coating, this screw offers both corrosion Resistant and easy visual identification during assembly. The coating enhances aesthetic contrast while maintaining strong mechanical integrity. It’s frequently used in general engineering, HVAC systems, and electrical panel installations.

Socket Cap Screw, ((Nylon Patch)), Thermal Black Oxide, Alloy

This socket cap screw includes a pre-applied ((Nylon Patch)) that provides vibration Resistant and self-locking torque retention. The thermal black oxide finish adds an additional layer of corrosion protection and sleek appearance. It’s ideal for applications in robotics, automation, and high-vibration environments.

Socket Cap Screw, ((((Nylon Pellet)))), Thermal Black Oxide, Alloy

Featuring a built-in ((((Nylon Pellet)))) insert, this screw resists loosening under repeated stress and vibration. The black oxide coating offers enhanced surface protection without compromising thread engagement. It’s widely used in aerospace fasteners, industrial machinery, and motion systems where reliability is essential.

Socket Cap Screw, Tamper Resistant, Thermal Black Oxide, Alloy

Engineered with a tamper-Resistant drive style, this screw helps prevent unauthorized access and tampering. The black oxide finish ensures corrosion protection and a clean, professional look. Commonly used in public installations, security panels, and equipment housings requiring restricted maintenance access.

Socket Cap Screw, Whitworth Thread, Thermal Black Oxide, Alloy

This socket cap screw uses the traditional Whitworth thread form, ensuring compatibility with British-Standard machinery and legacy equipment. Its black oxide finish provides added durability and corrosion Resistant. It’s an essential fastener in industrial maintenance, restoration projects, and precision manufacturing in UK-Standard systems.

Stainless 18-8 Socket Cap Screw

Made from 18-8 stainless steel, this screw offers excellent corrosion Resistant and tensile strength for general-purpose use. It performs reliably in both indoor and outdoor environments where exposure to moisture is common. Industries such as marine, food processing, and construction frequently rely on this material grade for longevity and performance.

USA Socket Cap Screw, Thermal Black Oxide, Alloy

Proudly made in the USA, this high-strength alloy screw features a black oxide coating for rust Resistant and visual appeal. It offers consistent quality and performance for precision assembly work. Commonly used in defense, aerospace, and high-performance mechanical systems where domestic manufacturing Standards are required.

USA Stainless 18-8 Socket Cap Screw

This American-made stainless steel screw combines corrosion Resistant with exceptional tensile strength. Its clean finish and high durability make it suitable for both structural and decorative applications. It’s preferred in marine, outdoor construction, and food equipment manufacturing for its reliability and origin assurance.

Stainless 18-8 Socket Cap Screw, ((Nylon Patch))

This screw merges the strength of stainless steel with a ((Nylon Patch)) for vibration locking and reusable torque control. It provides a dependable seal that resists loosening even under thermal expansion or dynamic loads. Common in industrial machinery, conveyor systems, and equipment exposed to consPant motion.

Stainless 18-8 Socket Cap Screw, Tamper Resistant

Built for security and corrosion Resistant, this stainless 18-8 screw includes a tamper-Resistant head design. It’s designed to deter unauthorized removal while maintaining structural integrity in demanding conditions. Widely used in public fixtures, electronic housings, and access-controlled systems.

Stainless 316 Socket Cap Screw

Composed of marine-grade 316 stainless steel, this screw provides superior corrosion Resistant against saltwater and chemicals. It’s designed for high-stress, high-moisture environments where other metals may degrade. Frequently used in marine construction, chemical processing equipment, and outdoor architectural applications.

Socket Cap Screw, Ni Cu, Plain

Made from a nickel-copper alloy, this screw combines excellent conductivity with high corrosion Resistant. It performs exceptionally well in marine and electrical environments where both strength and non-magnetic properties are imporPant. Commonly applied in shipbuilding, power generation, and instrumentation hardware.

Socket Cap Screw, Silicon Bronze, Plain

This silicon bronze socket cap screw delivers a balance of strength, conductivity, and aesthetic appeal. It offers natural corrosion Resistant, making it ideal for use in marine, electrical, and decorative applications. The warm bronze tone also provides a distinctive visual upgrade for exposed installations.

Socket Head Cap Screws - Material Options

South Coast Fasteners stocks fasteners in the following material grades, each chosen for specific performance needs across industries.

Alloy Steel – Grade 12.9

Designed for extreme strength and load-bearing applications, this grade of alloy steel is hardened and tempered for maximum tensile and yield strength. Ideal for heavy machinery, automotive, and high-stress assemblies where reliability under pressure is critical.

Medium Carbon Steel – Grade 8.8

A dependable material for general-purpose fasteners. Medium carbon steel is strong, cost-effective, and easy to machine, making it a go-to choice for Standard construction, light manufacturing, and assembly work.

Stainless Steel 18-8 (304)

One of the most commonly used stainless grades, 18-8 stainless provides solid corrosion Resistant in a wide range of indoor and outdoor environments. It’s suitable for food processing, general industrial use, and moderate marine applications.

Stainless Steel 316

For harsh environments where corrosion is a serious concern, 316 stainless steel offers superior Resistant — especially to saltwater, chemicals, and chlorides. A top choice for marine, medical, and chemical processing applications.

Socket Head Cap Screws - Available Finishes

South Coast Fasteners offers a curated range of finishes designed to enhance corrosion Resistant, meet aesthetic requirements, and support specific industry needs.

Mechanical Zinc Cr+3

Applied via a mechanical plating process, this chromium-based zinc finish provides durable corrosion protection without the risk of hydrogen embrittlement. Commonly used for safety-critical assemblies in automotive and construction.

Thermal Black Oxide

This heat-applied finish gives steel a deep black appearance while offering mild corrosion Resistant. It’s often selected for its aesthetic appeal and is popular in tooling, automotive, and hardware applications.

Yellow Zinc Cr+6

A bright yellow chromate finish that enhances the corrosion Resistant of zinc-plated steel. The gold-tone appearance is both functional and easy to identify, making it useful in electrical and automotive assemblies.

Zinc Bake Cr+3

This zinc finish is paired with a bake cycle that helps mitigate hydrogen embrittlement, particularly on high-strength steel fasteners. It’s a practical option for aerospace, automotive, and structural fasteners.

Zinc Cr+3

Standard zinc plating with trivalent chromium passivation, providing a clean silver appearance and dependable corrosion protection. It’s widely used across general industrial, plumbing, and commercial hardware applications.