Midwest Fasteners Grade 8 Yellow Zinc Plated Fine Thread Steel Hex Cap Screws

Midwest Fasteners Grade 8 Yellow Zinc Plated Fine Thread Steel Hex Cap Screws

Midwest Fasteners Grade 8 Yellow Zinc Plated Fine Thread Steel Hex Cap Screws are high-strength hex bolts built for structural and mechanical connections where a premium fastener is required. This family is available in bolt sizes ranging from 1/4"-28 up to 1/2"-20, with lengths spanning 3/4" through 4", giving fabricators and maintenance crews a single source for Grade 8 fine-thread hex cap screws across common diameters and lengths, including 5/16"-24 and 3/8"-24 in between. Each screw is manufactured from Grade 8 steel and finished in yellow zinc for added corrosion resistance over bare steel, then cut with a fine thread pattern and a standard hex head sized for a wrench or socket. These hex cap screws are sourced for consistent sizing and finish across the entire size range, making them a dependable choice anywhere a high-strength, fine-thread bolted connection is specified.

Key Features

• Size Range: Available from 1/4"-28 x 3/4" up to 1/2"-20 x 4", including 5/16"-24 and 3/8"-24 diameters in multiple lengths, so the correct size can be matched to the connection.
• Material & Finish: Grade 8 steel construction with a yellow zinc plated finish for improved corrosion resistance over unplated steel.
• Head & Connection: Standard hex head for use with a wrench or hex socket, providing a solid grip surface for torque application.
• Grade: Grade 8, the high-strength tier of SAE fastener grades, suited for demanding structural and mechanical connections.
• Thread: Fine thread pattern across every size in the family, offering finer thread engagement than a coarse thread hex cap screw of the same diameter.
• Type: Hex bolt / hex cap screw configuration for bolted connections requiring a cap screw rather than a through-bolt.
• Length Options: Lengths span from 3/4" up through 4" depending on diameter, giving a range of grip lengths within each bolt size.
• Origin: Manufactured in Thailand.

Technical Specifications

• Connection Type: Hex
• Product Size: 1/4" - 1/2"

Typical Applications

• Structural steel and machinery assembly requiring high-strength bolted joints.
• Automotive and equipment repair where Grade 8 strength and fine thread engagement are specified.
• Heavy equipment and fabrication work where a corrosion-resistant hex cap screw is needed.
• General maintenance and jobsite use anywhere a Grade 8 hex bolt with fine threads is called for.
• Multi-size projects where several diameters and lengths of Grade 8 fine-thread hex cap screws are needed from one listing.

Why Midwest Fasteners?

Midwest Fasteners supplies Grade 8 steel hex cap screws with a consistent yellow zinc finish and fine thread specification across the full 1/4" to 1/2" size range, giving contractors, fabricators and maintenance techs a dependable high-strength option for demanding bolted connections. Every diameter and length in this family shares the same Grade 8 material, fine thread pattern and yellow zinc finish, so crews can standardize on one source for fine-thread hex cap screws rather than mixing suppliers across sizes. Consistent material, grade and finish from batch to batch, and across every bolt size and length offered, make these hex cap screws a reliable choice for professional and jobsite work alike.