HOLO-KROME 64040 1/4-20 X 3/8吋 插座帽螺絲 | 按鈕頭六角驅動 | 合金鋼 熱處理黑色氧化物 (100件/包)

Had to replace a stripped screw on a milling fixture, and these button heads fit perfectly with no wobble. The black oxide finish feels sturdy and should hold up well in oily conditions.

Installed these on a jig for some precision drilling work and they seated perfectly flush. The hex socket drive made tightening them down in tight spaces a breeze, really solid hold.

These little button heads fit perfectly into a tight spot on a small jig I'm building, and the black oxide finish cleaned up easily with just a wipe. The hex drive seated firmly without any stripping, which was a relief.