M20-2.5 x 320mm 六角頭螺絲 | 等級10.9 鋼 普通 | 部分螺紋 (3/包)

Finally found a bolt set that actually handles high-torque applications without stripping. The 10.9 grade steel is noticeably tougher than standard hardware, and the hex head grips perfectly with a 19mm wrench.

The hex head on these M20 cap screws grabbed my socket perfectly, no slipping at all when I torqued them into a heavy equipment frame. For the price of a three-pack, this 10.9 steel feels solid for industrial use.

Threads are cut clean and the hex head took my 24mm socket without slipping. The 320mm length and partial threading let me get a solid bite through a thick flange, and the 10.9 steel feels properly rigid. Three in a pack is fine for the price.