براغي ذات رأس أسطواني مجوف M30-3.5 X 340 مم | محرك سداسي | ملولب جزئياً | فولاذ سبائكي فئة 12.9 أكسيد أسود حراري

Used these on a heavy jig build I’ve been working on, and the black oxide finish held up nicely under some oily handling. The 12.9 grade steel feels solid, and the hex socket drive engaged cleanly without any stripping. Definitely a step up from the standard screws I was using before.

The black oxide finish on these M30 screws is flawless—no rough edges or uneven coating. Installed perfectly into a custom jig I'm building, and the hex socket drive took torque without slipping. Exactly the quality I needed for heavy tooling work.

Used these M30 screws to rebuild a press jig at work and the hex socket drive made tightening them much easier than a traditional hex head. The partial threading gave just the right grip depth for the steel plate I was mounting.