براغي رأس مقبس M5-0.8 × 170 مم | محرك سداسي | ملولبة جزئيًا | فئة 12.9 فولاذ سبائكي أسود حراري (25 / عبوة)

These 170mm screws threaded exactly where I needed them for a jig setup, and the black oxide finish looks clean against the aluminum. The hex socket drive gripped firmly without any stripping, which is a relief when you're working with longer fasteners.

Was a little worried about the length at first, but the 170mm shaft is perfect for the jig I’m building, and the black oxide finish gives them a nice, uniform look. Threads cut cleanly into pre-drilled holes, and the hex socket gripped firmly without any stripping. Solid set of 25 for the price.

These replaced some old, rusted fasteners on my milling jig, and the black oxide coating is holding up perfectly with no signs of wear. The 170mm length was exactly what I needed for a deep clamping application.