براغي رأس أسطواني M8-1.25 × 155 مم | محرك سداسي | ملولبة جزئيًا | فئة 12.9 سبائك فولاذية مؤكسدة حرارياً باللون الأسود (25/عبوة)

Finally got around to fitting these on a heavy-duty tramming fixture, and the 12.9 alloy steel held up perfectly under full torque. The thermal black oxide finish didn't chip during tightening, which was a nice surprise.

Used these on a custom jig build, and the 155mm length was just right for clamping thick plates together. The black oxide finish held up well against minor scuffs during assembly.

The hex socket drive grips the allen key perfectly with zero stripping, even after torquing them down hard on my jig. The thermal black oxide finish is uniform and looks sharp against the steel. These are solid for the price.