5/16-18 x 2 1/2 Six Lobe Flat Thread Cutting Screw Type F Fully Threaded 18-8 Stainless Steel MPF188 this washer meets stringent quality

this washer meets stringent quality standards and is designed to handle demanding loads and vibrations

They are fully threaded and have a black zinc finish for corrosion resistance

With its 1/4-20 thread size

The screws have a Phillips drive type and an oval head

The M6 x 25 DIN 933 8

5/16-18 x 2 1/2 Six Lobe Flat Thread Cutting Screw Type F Fully Threaded 18-8 Stainless Steel MPF188 this washer meets stringent quality5 16 18 x 2 1 2 Six Lobe Flat Thread Cutting Screw Type F Fully Threaded 18 8 Stainless Steel **Size:** 5 16" diameter x 2 1 2" length **Thread:** 18 threads per inch **Type:** F **Head:** Flat **Drive:** Six lobe **Material:** 18 8 stainless steel **Finish:** Plain **Features:** Fully threaded, sharp point, single lead **Applications:** Metal to metal, plastic to metal, wood to metal