HOLO-KROME 69336 M4-0.7 X 30mm 插座頭螺絲 | 低頭六角插座驅動 | 合金鋼熱處理黑氧化物 (100個/包)

I needed screws for a precision jig, and these M4s fit perfectly with their low-profile head. The 30mm length gave me just the right grip depth in my assembly.

The black oxide finish on these is perfect for my jig builds - they slide into tapped holes smoothly without any binding, and the low head profile clears tight clearance spots that standard caps would've hit. I've already burned through half the box on precision fixtures and not a single one has str

Finally, M4 screws that are actually 30mm long from end to end, not just under the head. The hex drive feels crisp and secure in my Allen key, no stripped edges yet after installing a dozen into a jig fixture. Exactly what my precision assembly needed.