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HILLMAN 7/8-9 in. D X 3 in. L Heat Treated Steel Hex Head Cap Screw
HILLMAN 7/8-9 in. D X 3 in. L Heat Treated Steel Hex Head Cap Screw

HILLMAN 7/8-9 in. D X 3 in. L Heat Treated Steel Hex Head Cap Screw

Made in America

Support American manufacturers + independent hardware retailers in one purchase.

When your project demands serious strength, the Hillman 7/8"-diameter, 9 TPI, 3" long heat-treated steel hex head cap screw delivers reliable performance under heavy loads. Crafted…

Hillman MPN 220420 In Stock & Ready to Ship
Local Price Check i Local stores may price this as low as $60.99. Our online price is $67.99.
$67.99
Includes free shipping on orders over $75 · $8.99 standard below
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About Product Overview

When your project demands serious strength, the Hillman 7/8"-diameter, 9 TPI, 3" long heat-treated steel hex head cap screw delivers reliable performance under heavy loads. Crafted from high-grade steel and hardened through a precise heat-treatment process, this Grade 8 fastener is built to resist deformation and maintain a tight, secure fit in demanding applications.

Key specifications

  • Diameter: 7/8 in
  • Thread type: Coarse (9 TPI)
  • Length: 3 in
  • Head style: Hex head cap screw
  • Material: Steel
  • Finish: Heat treated
  • Grade: 8
  • Point type: Blunt
  • Packaging: Boxed
  • Pieces per package: 10 pc

The heat-treated, Grade 8 steel construction means higher tensile strength and improved resistance to wear in high-torque, high-stress assemblies. The blunt point is designed for use with pre-drilled holes or nuts, reducing the risk of cross-threading during installation. The coarse 9 TPI thread provides quicker engagement and strong clamping force, making this hex head cap screw ideal for heavy equipment, structural connections, and industrial maintenance tasks.

Ideal uses

  • Industrial machinery assemblies where a robust, long-lasting fastener is required
  • Structural framing and timber-to-metal connections with compatible nuts
  • Automotive, agricultural, and heavy-duty equipment maintenance
  • Custom fabrication projects that demand high-strength fasteners

Installation tips

  • Pair with a matching nut and washer for a secure, load-bearing connection
  • Ensure the mating hole is properly sized for a 7/8" diameter screw
  • For outdoor or corrosive environments, consider protective coatings or compatible hardware to extend life
  • Avoid overtightening to prevent thread damage; use standard torque procedures suited to the mating material

Choose Hillman for consistent tolerances, dependable performance, and a fastener you can rely on in the most demanding builds. Ready to tackle your next project with a high-strength hex head cap screw? This Hillman 7/8"-diameter, 9 TPI, 3" long unit is ready to ship in boxed packaging as a 10-piece set.

The Details Specifications

Brand Hillman
SKU 5304936
UPC 008236082920
Unit 0
Case Pack Quantity 2 per case
Retail Unit Quantity 1
Unit of Measure 10 BX
Dimensions (L × W × H) 5 × 4 × 3
Weight 7 lbs
Cubic Feet 0.1016 ft³
Country of Origin USA
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab

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