10pcs 304 Stainless Steel Hex Head Cap Screws UNC UNF Machine Screws

304 Stainless Steel External Hex Socket Head Cap Screws — 10-Pack

Upgrade your fastening projects with these premium 304 stainless steel external hex (outer hexagon) socket head cap screws. Available in a wide range of UNC and UNF thread sizes, these machine screws deliver outstanding corrosion resistance, strength, and precision fit — perfect for mechanical assemblies, DIY builds, woodworking fixtures, electronics enclosures, and general fabrication work.

Made in Mainland China.

Key Features

• Material: 304 stainless steel — highly resistant to rust, oxidation, and everyday wear
• Drive Style: External hex (outer hexagon) — easy to drive with a standard wrench or socket tool
• Head Style: Hex head cap for secure, flush or proud-surface fastening
• Thread Standards: UNC (Unified National Coarse) & UNF (Unified National Fine)
• Available Sizes: 8#-32, 8#-24, 10#-32, 10#-24, 1/4-28, 5/16-18, 3/8-16 (and more)
• Thread Diameter Range: 3/16″, 1/4″, 5/16″, 3/8″, 1/2″, 5/8″
• Pack Quantity: 10 pieces per pack
• Note: Stated length does NOT include the head length
• Customization: Available — contact us for bespoke size requirements

Size Reference Example

1/4-20 × 1/2 means: thread diameter d = 1/4 inch, thread count = 20 threads per inch, length L = 1/2 inch (head not included).

Where to Use

• Machinery and mechanical assemblies
• Electronics and enclosure panels
• DIY home improvement and woodworking
• Automotive components and brackets
• Marine and outdoor fixtures (thanks to stainless corrosion resistance)

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Frequently Asked Questions

Q: What thread standards do these stainless steel hex cap screws come in?

A: These screws are available in both UNC (Unified National Coarse) and UNF (Unified National Fine) thread standards. Common sizes include 8#-32, 8#-24, 10#-32, 10#-24, 1/4-28, 5/16-18, and 3/8-16, covering a wide range of fastening applications.

Q: Is the head length included in the stated screw length?

A: No — the stated length refers to the shank length only and does NOT include the hex head. For example, a 1/4-20 × 1/2 screw has a 1/2-inch shank; the head adds additional length beyond that measurement.

Q: Why choose 304 stainless steel for these hex cap screws?

A: 304 stainless steel offers excellent corrosion and oxidation resistance, making these screws suitable for both indoor and outdoor environments, including marine, automotive, and moisture-prone applications. They maintain their structural integrity and appearance far longer than standard carbon steel fasteners.

Q: Can I get custom sizes for these external hex socket head cap screws?

A: Yes, customization is available. Please contact us with your specific thread diameter, thread count, and length requirements and we will assist you with a tailored order.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.