3/8" X 4 1/4" 插座肩螺絲 | 插座頭 | 插座驅動 | 合金鋼 (25 個/包)

The precision-ground shoulder makes these screws spin true as an axle, no wobble or binding in my fixture. The hex drive seated cleanly with my driver, and all 25 pieces have that solid, machined feel you want for load-bearing pivots.

The precision-ground shoulder made these screws perfect for my milling machine restoration project. They fit snugly into the bearing surfaces without any wobble, and the hex socket drive handled the torque nicely.

These are exactly what I needed for building a custom linkage. The 4 1/4" length with that smooth 3/8" shoulder makes for a perfect pivot, and all 25 came with clean, uniform threads.