براغي رأس سداسي ثقيلة 5/8-11 × 6-1/2 بوصة | ASTM A193 B7 سبيكة فولاذ عادي | ملولبة جزئيًا (65/عبوة)

Finally got around to torquing these down on a compressor skid and the threads ran smooth the whole way without any galling. Six and a half inches of grip was exactly what I needed for that thick mounting plate.

Bought these for a heavy flange connection and the 6-1/2" length with partial threading made assembly a lot easier than using fully threaded bolts. The hex head gave my socket a solid grip without stripping.

These are the ones I reach for when I need to bolt down a heavy motor mount and they handle the stress without a hint of flex. The alloy steel feels solid and the partial threads give me just the right grip length for thick flanges. Already ordered a second box for the next job.