5/16"-18 Carriage Bolt Hot Dipped Galvanized 307A Grade A

5/16"-8 Hot Dip Galvanized Carriage Bolts

Diameter - Thread Pitch: 5/16-18


5/16"-18 Hot dipped galvanized carriage bolts have a domed or countersunk head, and the shank is topped by a short square section under the head.

  • Square section grips into the part being fixed (typically wood)
  • Prevents the bolt from turning when the nut is tightened
  • Carriage Bolts under 6 inches are fully threaded
  • Sizes over 6 inches in length have a shoulder
  • Coarse Thread
Hot Dipped Galvanized assemblies should be used exclusively. If you use a HDG bolt you must also use a HDG nut.


Select Products Below
Product Specifications
Body Diameter
5/16" (Max 0.324 - Min 0.298)
Color
Gray
Corner Radius on Square
0.031"
Corrosion Resistant
Yes
Filet Radius
0.031"
Finish
Hot Dip Galvanized
Head Diameter
Max 0.719 - Min 0.688
Head Style
Domed
Material
Steel
Other
All Carriage Bolts under 6 inches are fully threaded. Sizes over 6 inches in length have a shoulder.
Product Type
Carriage Bolt
Thread Direction
Right Hand
Thread Pitch (Count)
18 Per Inch
Thread Standard
UNC
Thread Type
Coarse
Tolerance (IFI)
Actual measurements may vary slightly +/- depending on production run within IFI Tolerances
Select Products Below
Qty
Size
Select Package Quantity
SubTotal
5/16"-18 x 3/4" FT
SKU #1070-058-0012
5/16"-18 x 3/4" FT
SKU #1070-058-0012
1
$0.15 (0.15/ea)
25
$2.25 (0.09/ea)
100
$8.00 (0.08/ea)
1000
$70.00 (0.07/ea)
 
5/16"-18 x 1" FT
SKU #1070-058-0022
5/16"-18 x 1" FT
SKU #1070-058-0022
1
$0.15 (0.15/ea)
25
$2.50 (0.10/ea)
100
$9.00 (0.09/ea)
1000
$80.00 (0.08/ea)
 
5/16"-18 x 1-1/4" FT
SKU #1070-058-0032
5/16"-18 x 1-1/4" FT
SKU #1070-058-0032
1
$0.15 (0.15/ea)
25
$2.75 (0.11/ea)
100
$10.00 (0.10/ea)
1000
$90.00 (0.09/ea)
 
5/16"-18 x 1-1/2" FT
SKU #1070-058-0042
5/16"-18 x 1-1/2" FT
SKU #1070-058-0042
1
$0.15 (0.15/ea)
25
$3.00 (0.12/ea)
100
$11.00 (0.11/ea)
1000
$100.00 (0.10/ea)
 
5/16"-18 x 1-3/4" FT
SKU #1070-058-0052
5/16"-18 x 1-3/4" FT
SKU #1070-058-0052
1
$0.15 (0.15/ea)
25
$3.50 (0.14/ea)
100
$13.00 (0.13/ea)
1000
$110.00 (0.11/ea)
 
5/16"-18 x 2" FT
SKU #1070-058-0062
5/16"-18 x 2" FT
SKU #1070-058-0062
1
$0.16 (0.16/ea)
25
$3.75 (0.15/ea)
100
$13.00 (0.13/ea)
1000
$120.00 (0.12/ea)
 
5/16"-18 x 2-1/4" FT
SKU #1070-058-0072
5/16"-18 x 2-1/4" FT
SKU #1070-058-0072
1
$0.18 (0.18/ea)
25
$4.00 (0.16/ea)
100
$15.00 (0.15/ea)
1000
$130.00 (0.13/ea)
 
5/16"-18 x 2-1/2" FT
SKU #1070-058-0082
5/16"-18 x 2-1/2" FT
SKU #1070-058-0082
1
$0.19 (0.19/ea)
25
$4.25 (0.17/ea)
100
$16.00 (0.16/ea)
1000
$140.00 (0.14/ea)
 
5/16"-18 x 2-3/4" FT
SKU #1070-058-0092
5/16"-18 x 2-3/4" FT
SKU #1070-058-0092
1
$0.21 (0.21/ea)
25
$4.75 (0.19/ea)
100
$17.00 (0.17/ea)
1000
$150.00 (0.15/ea)
 
5/16"-18 x 3" FT
SKU #1070-058-0102
5/16"-18 x 3" FT
SKU #1070-058-0102
1
$0.22 (0.22/ea)
25
$5.00 (0.20/ea)
100
$18.00 (0.18/ea)
1000
$160.00 (0.16/ea)
 
5/16"-18 x 3-1/2" FT
SKU #1070-058-0112
5/16"-18 x 3-1/2" FT
SKU #1070-058-0112
1
$0.25 (0.25/ea)
25
$5.75 (0.23/ea)
100
$21.00 (0.21/ea)
1000
$180.00 (0.18/ea)
 
5/16"-18 x 4" FT
SKU #1070-058-0122
5/16"-18 x 4" FT
SKU #1070-058-0122
1
$0.27 (0.27/ea)
25
$6.25 (0.25/ea)
100
$23.00 (0.23/ea)
1000
$210.00 (0.21/ea)
 
5/16"-18 x 4-1/2" FT
SKU #1070-058-0132
5/16"-18 x 4-1/2" FT
SKU #1070-058-0132
1
$0.31 (0.31/ea)
25
$7.25 (0.29/ea)
100
$26.00 (0.26/ea)
1000
$230.00 (0.23/ea)