براغي رأس مقبس M4-0.7 × 100 مم | محرك مقبس سداسي | ملولبة جزئيًا | فولاذ سبائكي درجة 12.9 مؤكسد حراري أسود (100 / علبة)

The black oxide finish is holding up well on these, and the class 12.9 strength gives me confidence in my jig assembly. No stripped heads yet after a dozen uses.

Finally got the 100mm length I needed for a custom jig, and the hex socket drive seated my Allen key perfectly without stripping. The thermal black oxide finish held up fine against light oil in my shop, so no rust after a week of use.

The black oxide finish on these M4 screws held up perfectly when I used them for a press tool jig—no rust after repeated coolant exposure. The hex socket drive made installation quick with a standard L-key, and the 100mm length was ideal for deeper assemblies. Actually a solid upgrade from standard