براغي رأس سداسية 1/4-20 × 1-3/4 بوصة | صناعة أمريكية | درجة L9 من سبائك الفولاذ مطلي بالزنك الأصفر | ملولبة جزئيًا (100 / عبوة)

Used these on a press fixture that takes a lot of vibration and the partially threaded length seated perfectly with zero play. The yellow zinc coating is holding up way better than the black oxide stuff I used before.

Finally found some bolts that don't snap under heavy torque—these L9 alloy steel hex heads are a beast for industrial assembly. The partial threading saved me time aligning brackets without stripping.

The hex heads on these bolts fit my socket perfectly without any wobble. Used them to replace critical fasteners on a press, and the L9 grade gives me real confidence in the load.