مسامير آلية سداسية مقاس 3/8-16 × 4 بوصات | فولاذ مطلي بالزنك | خيط جزئي (50/عبوة)

The partial threading on these bolts is perfect for aligning steel brackets where you need a clean grip section before the threads bite. All 50 came uniformly plated with no stripped threads in the box, and they cinched down solid on my trailer frame.

Used these to secure a heavy-duty workbench frame I’m building—the partially threaded shank made it easy to get a tight, stable connection without any slippage. The zinc coating seems sturdy and hasn’t shown any rust after a few days in a damp garage.

Had to replace some worn bolts on a trailer hitch, and these 4-inch machine bolts fit perfectly into the existing holes. The zinc plating looks clean and seems durable so far.