براغي رأس أسطوانية 5/16-18 × 6" | محرك سداسي | ملولبة جزئيًا | فولاذ مقاوم للصدأ 316 (25/عبوة)

Put two of these into a jig I'm building and the 316 stainless is visibly better quality than the 304 I usually get. The partially threaded portion gave me just the right grip depth without bottoming out.

Finally, a hex screw that actually stays put under vibration instead of backing out like the cheaper zinc ones I've used. The 316 stainless finish is noticeably slicker and hasn't shown a speck of rust after a month of outdoor exposure. Partially threaded design seated perfectly in my jig fixture.

I used these on a marine dock repair and the 316 stainless is holding up perfectly against the saltwater spray, no signs of corrosion yet. The hex socket drive made installation easy with a standard Allen wrench.