Print Template - Portland Bolt

A563 Grade Identification Markings

Grade Identification Marking	Specification	Material	Nominal Size, In.	Proof Load Stress, ksi	Hardness Rockwell		See Note
Grade Identification Marking	Specification	Material	Nominal Size, In.	Proof Load Stress, ksi	Min	Max	See Note
	ASTM A563 Grade O**	Carbon Steel	1/4 - 1-1/2	69	B55	C32	2,3
	ASTM A563 Grade A	Carbon Steel	1/4 - 1-1/2	90	B68	C32	2,3
	ASTM A563 Grade B	Carbon Steel	1/4 - 1	120	B69	C32	2,3
	ASTM A563 Grade B	Carbon Steel	>1 - 1-1/2	105	B69	C32	2,3
	ASTM A563 Grade C	Carbon Steel, may be Quenched and Tempered	1/4 - 4	144	B78	C38	4
	ASTM A563 Grade C3	Atmospheric Corrosion Resistant Steel, may be Quenched and Tempered	1/4 - 4	144	B78	38	4,6
	ASTM A563 Grade D	Carbon Steel, may be Quenched and Tempered	1/4 - 4	150	B84	C38	5
	ASTM A563 Grade DH	Carbon Steel, Quenched and Tempered	1/4 - 4	175	C24	C38	5
	ASTM A563 Grade DH3	Atmospheric Corrosion Resistant Steel, Quenched and Tempered	1/4 - 4	175	C24	C38	4,6
In addition to the indicated grade marking, all grades, except A563 grades O, A, and B, must be marked for manufacturer identification. Nuts are not required to be marked unless specified by the purchaser. When marked, the identification marking shall be the grade letter O, A, or B. Properties shown are those of nonplated or noncoated coarse thread nuts. Properties shown are those of coarse thread heavy hex nuts. Properties shown are those of coarse thread heavy hex nuts. Other nuts styles and fine threads may apply. The nut manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant steel. **ASTM A563 Grade O has been discontinued. Inch Fastener Standards. 7th ed. Cleveland: Industrial Fasteners Institute, 2003. n-80-n-81.

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