Print Template - Portland Bolt

ASTM Grade and Diameter	Hole Type in Outer Ply	Required Washer
A325 or F1852 (½" - 1½")	Oversized or Short-Slotted	ASTM F436¹
A325 or F1852 (½" - 1½")	Long-Slotted	5/16" thick plate washer or continuous bar^{2, 3}
A490 (≤ 1")	Oversized or Short-Slotted	ASTM F436¹
A490 (≤ 1")	Long-Slotted	5/16" thick plate washer or continuous bar^{2, 3}
A490 (> 1")	Oversized or Short-Slotted	5/16" thick ASTM F436^{2, 4}
A490 (> 1")	Long-Slotted	ASTM F436 with a 3/8" thick structural grade plate washer or continuous bar²
This requirement does not apply to round head tension-control bolts that meet the dimensional tolerances of F1852 Multiple stacked washers that add up to a thickness of 5/16" do not meet the requirement The washer must be structural-grade steel, but does not need to be hardened A 3/8" thick plate washer and a regular F436 washer can be used instead. The plate washer doesn't need to be hardened

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