Button Head Socket Cap Screws 1/4-28 x 3-1/2 in - Corrosion-Resistant

In this review of the Button Head Socket Cap Screws 1/4-28 x 3-1/2 in, the bottom line is simple: these fasteners are for anyone who needs reliable, corrosion-resistant machine screws with a clean look. The pack delivers consistent thread quality, a bright polished finish, and an Allen socket drive that makes installation straightforward. For small to medium projects like furniture assembly, motorcycle fairings, and mounting electronics, the screws offer dependable hold and a neat appearance without costing much or requiring specialty tools.

Key Features

• 18-8 Stainless Steel Construction: Provides solid strength and good corrosion resistance for indoor and many outdoor uses, keeping fastened joints dependable over time.
• Precise Thread and Head Dimensions: The 0.250 in thread diameter and consistent machining ensure a secure machine thread fit and reliable engagement in tapped holes.
• Button Head with Bright Finish: The low-profile 0.437 in head and polished look give projects a clean, finished appearance where aesthetics matter.
• Allen Socket Drive for Easy Installation: The 5/32 in Allen drive allows controlled tightening and works with common hex keys for straightforward assembly.
• Full Thread Length: The fully threaded shank provides maximum clamping range and flexibility for through-bolting and variable-depth applications.
• Value Pack Quantity: Twenty-five screws in one pack suit repeated installs or projects that require multiple matching fasteners.

Who It's For

These screws are well suited to hobbyists, home DIYers, and tradespeople who need consistent machine-thread fasteners for furniture, appliances, electronics mounting, and light automotive or motorcycle work. The bright button head also makes them a good choice for visible fixtures and decorative hardware.

Those needing heavy structural fasteners, marine-grade chloride resistance, or specialty coatings should look elsewhere; while 18-8 stainless steel is corrosion-resistant for many uses, it is not the highest grade for prolonged saltwater exposure or extreme environments.

Pros & Cons

Pros

• High-quality 18-8 stainless provides strength and corrosion resistance for general use.
• Clean, polished button head improves appearance on visible assemblies.
• Accurate threads and consistent fit make installation predictable and secure.
• Adequate pack quantity and full thread length offer good value for multiple projects.

Cons

• 18-8 stainless is not the top choice for prolonged marine exposure compared with higher alloys.
• Button head is low profile but may not provide the same bearing area as larger head types in some applications.

Specifications

Thread Diameter	0.250 in (1/4-28)
Length	3-1/2 in
Head Diameter	0.437 in
Head Height	0.132 in
Drive Size	5/32 in Allen socket
Material	18-8 Stainless Steel
Pack Quantity	25 screws

Our Verdict

For most home improvement, furniture, and light automotive or motorcycle tasks, these button head socket cap screws offer a solid combination of appearance, thread quality, and corrosion resistance at a reasonable price. They are a practical choice when a neat, low-profile fastener and reliable machine-thread engagement matter, though projects requiring premium marine corrosion resistance should consider higher-grade alloys.

Frequently Asked Questions

Are these screws fully threaded?
Yes, the screws are full thread, which provides maximum clamping flexibility and is useful for through-bolting and varied material thicknesses.

What Allen key fits these screws?
The Allen socket drive is 5/32 in, compatible with standard hex keys of that size for installation and removal.

Is the stainless steel suitable for outdoor use?
18-8 stainless steel offers good corrosion resistance for many outdoor and indoor applications but is not the highest grade for prolonged saltwater or highly corrosive environments.