The characteristics of the bolt are its round head and the square neck underneath which is formed for the purpose of stop the bolt from rotation. These products are popular used in connecting steel materials, for example, cars, lifeboats, and textile machinery.
18-8/316 ROUND HEAD SQUARE NECK CARRIAGE BOLTS
Diameter: 1/ 4" - 3/ 4" x Length: up to 12"
DIN 603 A 2/A4 MUSHROOM HEAD SQUARE NECK BOLTS
Diameter: M6 - M20 x Length: up to 300mm