Midwest Fasteners Grade 8 Yellow Zinc Hex Washer Head Flange Bolt

Midwest Fasteners Grade 8 Yellow Zinc Hex Washer Head Flange Bolt

Midwest Fasteners' Grade 8 Hex Washer Head Flange Bolt family covers coarse-thread sizes from 1/4"-20 through 3/8"-16, with lengths across the line ranging from 3/4" up to 3", for shop, fabrication, and equipment-repair work. Every bolt in this family is machined from Grade 8 steel and finished in yellow zinc for corrosion resistance beyond bare steel, with an integral hex washer flange under the head that seats directly against the work surface. That built-in flange spreads clamp load over a wider bearing area than a standard hex head alone, often eliminating the need for a separate flat washer and reducing the chance of the head digging into softer materials. Coarse thread pitches across the family (20 TPI on 1/4", 18 TPI on 5/16", 16 TPI on 3/8") engage reliably with standard hex nuts and tapped holes, delivering higher strength than Grade 2 or Grade 5 hardware.

Key Features

• Size Range: Available in 1/4"-20, 5/16"-18, and 3/8"-16 thread sizes, with lengths across the family ranging from 3/4" up to 3", so the right length is available for the application at hand.
• Material & Finish: Steel construction with a yellow zinc finish for added corrosion resistance over bare steel in general shop and outdoor-adjacent use.
• Hex Washer Flange Head: Integral washer flange under the hex head distributes clamping force across a wider bearing surface, reducing the chance of the head digging into softer substrates and often eliminating a separate flat washer.
• Grade 8: Grade 8 steel construction delivers higher tensile and shear strength than standard Grade 2 or Grade 5 hardware, suited to higher-load mechanical and structural joints.
• Coarse Thread: Standard coarse thread pitches across the family are compatible with common Grade 8 and Grade 5 hex nuts and tapped components for fast, reliable engagement.
• Consistent Manufacturing: Every bolt is produced to consistent thread and head dimensions for predictable fit with standard hex nuts and tapped holes, bolt to bolt and size to size.

Technical Specifications

• Product Type: Flange Bolt
• Grade: 8
• Product Material: Steel
• Product Finish: Yellow Zinc
• Country of Origin: Thailand
• Thread Sizes: 1/4"-20, 5/16"-18, 3/8"-16
• Length Range: 3/4" to 3"

Typical Applications

• Automotive, equipment and machinery assembly where a Grade 8 fastener with an integral washer bearing surface is needed
• Agricultural and off-road equipment repair and maintenance
• Fabrication and metalworking projects requiring high-strength coarse-thread hardware
• General shop and maintenance use where a flange bolt replaces a hex bolt plus flat washer

Why Midwest Fasteners?

Midwest Fasteners supplies Grade 8 steel hardware with consistent sizing, thread quality, and finish across the full range of thread sizes and lengths, so maintenance techs and fabricators can count on repeatable fit from bolt to bolt and size to size. The yellow zinc finish and integral hex washer flange reflect practical, load-focused construction for everyday structural and mechanical fastening work.