M20-2.5 X 190mm 內六角圓柱頭螺絲 | 內六角驅動 | 部分螺紋 | 12.9 級合金鋼熱處理黑色氧化 (10 / 包)

I needed longer cap screws for a custom jig setup and these 190mm ones were exactly the right length. The hex socket drive made installation straightforward and the partially threaded design held securely.

The black oxide finish on these M20 screws looks fantastic and seems durable; they threaded smoothly into my tooling fixture without any binding. Nice to have class 12.9 strength for high-torque applications where you can't afford failure.

The hex socket drive seated perfectly with my Allen key, and the thermal black oxide finish gave them a clean, uniform look that should resist shop grime well. Threads were smooth from the partial threading down to the tip, and the 12.9 alloy steel feels rock solid for jig building. Exactly what I n