This is DIN 6921 standard 3/8"-16 x 1" Flanged Bolts.
3/8"-16 x 1" Flanged Bolts has Pitch 16TPI, it's screw Length : 1-1/2" (Excluding Head) and diameter of head is 14mm, diameter of hex washer: 20.5mm, height of head: 9.9mm.
It's made of quality stainless steel A2-70, which corrosion resistance, duable.
Package comes with 10pcs 3/8"-16 x 1" hexagon bolts in one plastic storage box.
Color: Silver; Plain finish;
Description
Flange bolts are composed of hexagonal heads and flanges, and their "ratio of support area to stress area" is greater than that of ordinary bolts, so this bolt can withstand higher preload and has better anti-loosening performance, so it is widely used in automobile engines, heavy machinery and other products.