Round Domed Head Carriage Bolts A307 Gr. A (Grade 2) Low Carbon Steel with Hot Dip Galvanized Finish for corrosion protection in harsh marine and exterior environments. A square neck under the head keeps the bolt from turning in the material when tightening a nut. The smooth, large diameter rounded head provides a finished appearance. Length is measured from underneath the head.
Technical Specs
Manufacturer
KL Jack Quality Vendor
Item Type
Carriage Bolt
System of Measurement
Inch
Diameter
5/16"
Length (inches)
1"
Depth of Square
0.187" max / 0.156" min
Finish
Hot Dip Galvanized
Grade
2
Head Diameter
0.719" max / 0.688" min
Head Height
0.176" max / 0.156" min
Head Style
Round
Material
Steel
Dimensional Specification
ASME B18.5
Finish Specification
ASTM A153
Material Specification
A307 Grade A
Thread Specification
ASME B1.1, UNC Class 2A prior to coating (per A307 after Galvanizing)
