Nut Compatibility Chart

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Bolt Grade	Finish Type	Diameter Range (in.)	Compatible Nut Grades (ASTM A563)
			Preferred Options		Alternate Options
			Hex Nut	Heavy Hex Nut	Hex Nut	Heavy Hex Nut
A307 Grade A & C	All Finishes	1/4 – 1-1/2	A		B, D, DH	A, B, C, D, DH, DH3
		Above 1-1/2 – 2		A	A	C, D, DH, DH3
		Above 2 – 4		A		C, D, DH, DH3
A307 Grade B	All Finishes	1/4 – 1-1/2		A	B, D, DH	A, B, C, D, DH, DH3
		Above 1-1/2 – 2		A	A
		Above 2 – 4		A
F3125 A325 Type 1	Plain	1/2 – 1-1/2		C		C3, D, DH, DH3
F3125 A325 Type 1	Hot Dip Galv.	1/2 – 1-1/2		DH
F3125 A325 Type 3	Plain	1/2 – 1-1/2		C3		DH3
A354 Grade BC	Plain	1/4 – 1-1/2		C	D, DH	C3, D, DH, DH3
	Plain	Above 1-1/2 – 4		C		C3, D, DH, DH3
	Galvanized	1/4 – 1-1/2		DH
	Galvanized	Above 1-1/2 – 4		DH
A354 Grade BD	Plain	1/4 – 1-1/2		DH	DH	D, DH, DH3
A354 Grade BD	Plain	Above 1-1/2 – 4		DH		DH3
A449	Plain	1/4 – 1-1/2	B		D, DH	B, C, C3, D, DH, DH3
	Plain	Above 1-1/2 – 3		A		C, C3, D, DH, DH3
	Galvanized	1/4 – 1-1/2		DH	D, DH	D
	Galvanized	Above 1-1/2 – 3		DH		D
F3125 A490 Type 1	Plain	1/2 – 1-1/2		DH		DH3
F3125 A490 Type 3	Plain	1/2 – 1-1/2		DH3
A687	Plain	5/8 – 3		D		DH, DH3
A687	Galvanized	5/8 – 3		DH
F1554 Grade 36	Any	1/2 – 1-1/2	A		B, D, DH	A, B, C, D, DH, DH3
F1554 Grade 36	Any	Above 1-1/2 – 4		A		C, D, DH, DH3
F1554 Grade 55	Plain	1/2 – 1-1/2	A		B, D, DH	A, B, C, D, DH, DH3
	Plain	Above 1-1/2 – 4		A		C, D, DH, DH3
	Galvanized	1/2 – 4		A		C, D, DH, DH3
F1554 Grade 105	Plain	1/2 – 1-1/2	D			DH, DH3
	Plain	Above 1-1/2 – 3		DH		DH3
	Galvanized	1/2 – 3		DH		DH3
Note: As per ASTM A563/A563M, nuts manufactured to A194 Grade 2H and marked accordingly can be used as an equivalent substitute for Grade DH nuts.