六角穴付きボルト M20-2.5 X 170mm | クラス10.9 鋼 黄亜鉛メッキ | 部分ねじ (10本/袋)

The partial threading on these M20 bolts is exactly what I needed for pulling two flanges together—the smooth shank seats perfectly while the threads grab cleanly. The 10.9 hardness feels solid and the yellow zinc coating has a consistent finish across all ten pieces.

The threads are clean and the yellow zinc coating looks evenly applied, so these should hold up well in a shop environment. I used them to bolt down a motor mount and the 10.9 rating gives me confidence they'll take the torque without stretching.

These bolts are solid as a rock. The 10.9 yellow zinc finish is holding up well so far, and the partial threading makes alignment a lot easier when you're torquing them down on heavy equipment.