5/16-18 X 4" 機械螺絲 | 圓頭十字驅動 | 18/8 不鏽鋼 (100 顆/包)

These fit perfectly on my boat trailer where I needed non-magnetic hardware that wouldn't rust near saltwater. The truss head gives a nice low profile and the threading was clean all the way along.

Had to swap out some rusted bolts on my boat trailer, and these stainless steel screws held up perfectly after a week in saltwater. The truss head sits flush without catching on anything, and the Phillips drive bit into place without slipping. Exactly what I needed for a corrosion-proof fix.

Used a few of these to secure a heavy gate latch outdoors. The 4-inch length gave plenty of bite, and the stainless heads haven't shown a speck of rust after two weeks of rain. Exactly what I needed.