HOLO-KROME 720002530 1/2-13 x 5-1/4" 內六角螺絲 | 六角驅動 | 合金鋼 熱處理黑色氧化 (10個/包)

I needed something sturdy for a jig I’m building, and these 1/2-13 screws fit perfectly with the hex socket drive. The 5-1/4" length gives excellent grip, and the black oxide finish looks clean and seems durable.

The black oxide finish on these screws is exactly what I needed for a tooling setup—they slide into the hex socket without any wobble. Threads were clean and cut smoothly over the full 5-1/4" length, no binding or rough spots. Solid choice for precision assemblies where you can't afford a stripped h

Used these to mount a heavy-duty fixture on a mill table, and the 5-1/4" length was exactly what I needed. The black oxide finish held up well against cutting fluid and still looks clean after a week of use.