FEATURES: Standard carriage bolt (square neck, round head): Grade 2, 5, 8 (grade 8 carriage bolts are also known as shaker screen bolts), stainless steel (18-8 and 316 series), brass, silicon bronze, aluminum, exotic materials, and titanium. ... Short neck, round head (the square neck is shorter than standard) in grade 2 steel.

SPECIFICATIONS:

3/16, 1/4. 5/16, 3/8, 1/2 

STEEL:  304 Stainless