M4-0.7 X 30mm 內六角平頭螺絲 | 平頭內六角驅動 | 半牙 | 12.9級合金鋼熱處理黑氧化 (400個/包)

The hex socket drive seats perfectly on my Allen key with zero wobble, and the black oxide finish gives them a slick, uniform look across all 400 pieces. I’ve used about fifty so far on a jig build and every single one threaded clean without any binding or burrs. This is exactly the kind of batch co

The partially threaded design on these made aligning my jig components much easier than standard fully threaded bolts. The black oxide finish looks clean and hasn't shown any rust yet after a few weeks in my shop.

I needed some strong fasteners for a metal jig I was building, and these M4-0.7 x 30mm screws are exactly what I was hoping for. The 12.9 grade steel is clearly tough, and the flat head sits flush perfectly in my countersunk holes.