Grade 5 Coarse Hex Cap Screws 1/4-20 x 5-1/2 in - Durable Zinc Steel

Our review of these Grade 5 coarse hex cap screws finds them best suited for projects that need long, reliable fasteners without paying for stainless or specialty coatings. The package of 100 bolts delivers consistent dimensions and a usable zinc finish that improves corrosion resistance for general-purpose tasks. For contractors, hobbyists, and maintenance crews who need a ready supply of 1/4-20 x 5-1/2 in hex head bolts, the most compelling reason to buy is simple: you get a large quantity of strong, heat-treated steel fasteners with a standard 7/16 in hex head at an accessible value.

Key Features

• Diameter 1/4 in: Fits standard 1/4-20 threaded holes and common hardware patterns, making these bolts versatile for many assemblies.
• Length 5-1/2 in: Provides extra reach for joining thicker materials or stacking components where shorter bolts would not suffice.
• Grade 5 steel: Offers a balance of strength and ductility suitable for many structural and mechanical fastening tasks.
• Zinc finish: A light plating that adds measurable rust resistance for indoor and sheltered outdoor use.
• Hex head (7/16 in wrench): Common wrench size makes driving and torqueing these bolts straightforward with standard tools.
• 100-piece pack: Large quantity reduces repeat ordering and keeps spare fasteners on hand for ongoing projects.

Who It's For

These hex cap screws are aimed at tradespeople, facility maintenance teams, and serious DIYers who regularly assemble or repair equipment and need durable, long bolts at an economical price. The pack size and common sizing make them convenient for farm, automotive frame work, and light industrial uses where Grade 5 strength is appropriate.

Those who need maximum corrosion resistance, such as coastal installations or submerged environments, should consider stainless or specially coated fasteners instead. Also, for critical structural connections that require engineer-specified grades beyond Grade 5, consult a licensed builder or structural engineer before use.

Pros & Cons

Pros

• Consistent 1/4-20 thread and 5-1/2 in length make the pack reliable for repeat projects.
• Grade 5 steel provides solid strength for a wide range of mechanical tasks.
• Zinc plating improves rust resistance compared with bare steel, adding life in many settings.
• Large 100-piece quantity offers good value and convenience for bulk jobs.

Cons

• Zinc finish is only light plating and not as corrosion resistant as stainless alternatives.
• Not intended for applications that require certified high-strength or specialty fasteners without professional approval.

Specifications

Our Verdict

These 1/4-20 x 5-1/2 in Grade 5 hex cap screws are a practical choice for general maintenance, farm, and shop use where affordable strength and quantity matter. The zinc finish and common hex head make them easy to use with standard tools, and the 100-piece pack represents good value for non-critical structural and mechanical fastening work.

Frequently Asked Questions

Are these bolts suitable for outdoor use?
The light zinc plating gives better rust resistance than bare steel and is fine for sheltered outdoor use, but for prolonged exposure or coastal conditions choose stainless or a heavy coating.

What wrench size fits the head?
The hex head is sized for a 7/16 in wrench, which is a standard tool size and easy to source.

Are these bolts heat treated?
They are Grade 5 steel, which indicates a medium level of hardening appropriate for common structural and mechanical tasks; consult an engineer for critical load applications.