M20-2.5 X 90mm 內六角螺絲 | 內六角驅動 | 半牙 | 8.8級合金鋼熱處理黑化 (25入/包)

Threads cut perfectly and the hex socket drive seated without any wobble on my torque wrench. The thermal black oxide coating held up well during assembly, and all 25 had consistent threads throughout. Exactly what I needed for a steel jig setup.

The black oxide finish looks clean and professional on the jig I assembled, and the hex socket seating felt snug without any wobble. Threading them into pre-tapped holes was smooth, though I would have liked a few extra millimeters of grip on the partially threaded portion. Solid hold for the price

Pulling these out of the package, the 8.8 alloy steel feels seriously solid, not cheap. The partially threaded design made mounting a heavy jig plate way easier than using fully threaded bolts.