Zoro Select 430351-PG 1"-8 Socket Head Cap Screw

Industrial Fastener for Heavy Assembly

The Zoro Select 430351-PG is a Grade 8 alloy steel socket head cap screw built for high-strength clamping in structural and mechanical joints. Its 1"-8 coarse thread and fully threaded 3 1/4 inch length suit heavy equipment, frame fabrication and maintenance tasks where maximum preload matters. The 3/4 inch socket drive allows high torque application without cam-out. Black oxide finish provides mild corrosion resistance and reduces glare in indoor industrial settings.

Replaces Lower-Grade Hardware Under High Load

This fastener upgrades from Grade 5 or ungraded bolts when joint integrity depends on proven tensile strength and consistent heat treatment. The jump is worth it whenever design calculations call for Grade 8 minimum thread length and head dimensions per ANSI B 18.3. It is not for applications requiring stainless corrosion resistance, fine-thread adjustment or flange-load distribution. Buyers needing a longer grip length or a different drive style must select another part.

Straightforward Install With Standard Tooling

Installation uses a common 3/4 inch hex bit or socket, so no special drivers are required. The fully threaded shank simplifies engagement but demands that the hole depth accommodates the full 3 1/4 inch length. Over-torquing risks stretching the alloy shank beyond yield, while under-torquing leaves the joint vulnerable to vibration loosening. Verify thread fit and hole alignment before final tightening to avoid cross-threading.