5/8-11 X 3-1/2" 內六角螺絲 | 六角驅動 | 部分螺紋 | 316不鏽鋼 (25個/包)

Got these for a custom tooling fixture at the shop and the 316 stainless finish is a relief—no rust worries even with coolant splashing around. The partially threaded length let me clamp down tight without bottoming out, and all 25 came with clean, sharp threads.

The hex socket drive on these grabbed my Allen key perfectly, no stripping at all even when I torqued them down hard on a jig fixture. The 316 stainless finish looks clean and should hold up way better than the zinc-coated ones I've used before.

Used a handful of these to secure a heavy fixture to a machine table, and the 316 stainless is holding up perfectly in our damp shop. The hex socket drive made installation straightforward even in a tight spot.