5/16"-18 X 1-1/4" Machine Screws | Indented Hex Head | 18/8 Stainless Steel (500/Pkg.)

Machine Screws Unslotted Indented Hex 18/8 Stainless 5/16-18 X 1 1/4 are high-performance fasteners designed for demanding machine assemblies. Made from 18/8 stainless steel, these screws deliver excellent corrosion resistance and durable strength for long-lasting results. The 5/16-18 thread size and 1 1/4 inch length suit a range of equipment and panels, with a compact, unslotted indented hex drive for secure engagement in tight spaces.

Specifications

• Material: 18/8 stainless steel (304) for superior corrosion resistance
• Drive Type: Unslotted Indented Hex
• Thread Size: 5/16-18
• Length: 1 1/4 in
• Finish: Stainless steel (natural)

Applications include equipment enclosures, control panels, machinery assemblies, and general hardware projects where a strong, corrosion-resistant fastener is required. The 18/8 stainless composition helps resist rust in humid or coastal environments, making these screws a reliable choice for both indoor and outdoor use when paired with compatible nuts or threaded inserts.

Why choose these machine screws? They combine a robust hex drive with a compact head profile that minimizes protrusion and reduces snagging in tight spaces. Suitable for use with corresponding nuts and inserts that match 5/16-18 threads, these screws provide a secure, vibration-resistant connection for durable performance.