重型六角螺絲 1"-8 x 3-3/4" | ASTM A193 B7 合金鋼無處理 | 部分螺紋 (35個/包)

Threads were clean and the 1-inch diameter seated perfectly into my coupling—no fighting or cross-threading. The partial thread length was exactly right for my flange setup, and at this price per package of 35, I'm stocked for several jobs.

The heat treatment on these B7s feels right—they’re noticeably harder than the grade 5s I’ve been using, and the partial threading made alignment in the flange a breeze. Took a full torque without a hint of galling, which is exactly what I needed for the pump base rebuild.

The threads on these are clean and cut perfectly, so they started by hand with no binding. I used them to bolt down a heavy press at the shop, and the grip length on the partial thread made alignment a breeze.