Fine Threaded 18-8 / 304 Stainless Steel Phillips Pan Head Machine Screws. Right Hand Fine Thread, UNF Fully Threaded Rust and Corrosion Resistant Fine Threaded Pan Head Machine Screws Are Used in Machinery, Metal Applications, Automotive. Standards: ANSI B18.6.3 Fine Pitch Machine Screws in 18-8 / 304 Stainless Steel. Contact Our Sales Department for Bulk Pricing.