#4-40 x 5/16" 內六角螺絲 | 六角驅動 | 全螺紋 | 316 不鏽鋼 (800 個/包)

The hex socket drive made installation so much easier than a standard slotted screw. I used them for a small jig and the 316 stainless feels solid and corrosion-resistant.

For a small fastener, the hex socket drive gives you way better grip than a Phillips or slotted — no cam-out when you're tightening down on a jig. The 316 stainless steel feels solid and corrosion-resistant, exactly what I needed for outdoor machinery.

I was pleasantly surprised by how consistent the threads are on all 800 of these #4-40 screws. The 316 stainless steel feels solid and should hold up well in my jig assembly without rusting.