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ASTM A563

Jun 15,2018

Standard for Nut	Grade	Hardness	Dimensional style of nut	Nominal nut size	Proof Load Stress ksi		Head Marking
Standard for Nut	Grade	Hardness	Dimensional style of nut	in.	Non-Zinc coated Nuts	Zinc coated Nuts	Head Marking
A563	A	HRB68-HRC32	hex	1/4 to 1-1/2	90	68	/
			heavy hex	1/4 to 4	100	75	/
			hex thick	1/4 to 1-1/2	100	75	/
	B	HRB69-HRC32	hex	1/4 to 1	120	90	/
			hex	1-1/8 to 1-1/2	105	79	/
			heavy hex and hex thick	1/4 to 1	133	100	/
			heavy hex and hex thick	1-1/8 to 1-1/2	116	87	/
	C/C3	HRB78-HRC38	heavy hex	1/4 to 4	144	144
	D	HRB84-HRC38	hex	1/4 to 1-1/2	135	135
			heavy hex	1/4 to 4	150	150
			hex thick	1/4 to 1-1/2	150	150
	DH	HRC24-HRC38	hex	1/4 to 1-1/2	150	150
			heavy hex	1/4 to 4	175	150
			hex thick	1/4 to 1-1/2	175	175
	DH3	HRC24-HRC38	heavy hex	1/4 to 4	175	150

Mechanical Requirements A563

Mechanical Requirements

Nuts with UNC, 8UN, 6UN and Coarser Pitch Threads

Grade of Nut	Nominal Nut Size,In.	Style of Nut	Proof Load Stress, ksi A		Hardness
			Non-Zinc Coated NutsB	Zinc Coated Nuts B	Brinell		Rockwell
			Non-Zinc Coated NutsB	Zinc Coated Nuts B	Min	Max	Min	Max
O	1/4 to 1-1/2	Square	69	52	103	302	B55	C32
A	1/4 to 1-1/2	Square	90	68	116	302	B68	C32
O	1/4 to 1-1/2	Hex	69	52	103	302	B55	C32
A	1/4 to 1-1/2	Hex	90	68	116	302	B68	C32
B	1/4 to 1	Hex	120	90	121	302	B69	C32
B	1/8 to 1-1/2	Hex	105	79	121	302	B69	C32
DC	1/4 to 1-1/2	Hex	135	135	159	352	B84	C38
DHD	1/4 to 1	Hex	150	150	248	352	C24	C38
DH3	1/2 to 1	Hex	150	150	248	352	C24	C38
A	1/4 to 4	heavy hex	100	75	116	302	B68	C32
B	1/4 to 1	heavy hex	133	100	121	302	B69	C32
B	1-1/8 to 1-1/2	heavy hex	116	87	121	302	B69	C32
CC	1/4 to 4	heavy hex	144	144	143	352	B78	C38
C3	1/4 to 4	heavy hex	144	144	143	352	B78	C38
DC	1/4 to 4	heavy hex	150	150	159	352	B84	C38
DHD	1/4 to 4	heavy hex	175	150	248	352	C24	C38
DH3	1/4 to 4	heavy hex	175	150	248	352	C24	C38
A	1/4 to 1-1/2	hex thick	100	75	116	302	B68	C32
B	1/4 to 1	hex thick	133	100	121	302	B69	C32
B	1-1/8 to 1-1/2	hex thick	116	87	121	302	B69	C32
DC	1/4 to 1-1/2	hex thick	150	150	159	352	B84	C38
DHD	1/4 to 1-1/2	hex thick	175	175	248	352	C24	C38
Nuts with UNF, 12UN, 6UN and Finer Pitch Threads
O	1/4 to 1-1/2	Hex	65	49	130	302	B55	C32
A	1/4 to 1-1/2	Hex	80	60	116	302	B68	C32
B	1/4 to 1	Hex	109	82	121	302	B69	C32
B	1-1/8 to 1-1/2	Hex	94	70	121	302	B69	C32
DC	1/4 to 1-1/2	Hex	135	135	159	352	B84	C38
DHD	1/4 to 1-1/2	Hex	150	150	248	352	C24	C38
A	1/4 to 4	heavy hex	90	68	116	302	B68	C32
B	1/4 to 1	heavy hex	120	90	121	302	B69	C32
B	1-1/8 to 1-1/2	heavy hex	105	79	121	302	B69	C32
DC	1/4 to 4	heavy hex	150	150	159	352	B84	C38
DHD	1/4 to 4	heavy hex	175	175	248	352	C24	C38

A To determeine nut proof load in pounds, multiply the appropriate nut proof load stress by the tensile stress area of the thread. Stress areas for UNC, UNF,and 88UN thread series are given in table.

B Non-zinc coated nuts are nuts intended for use with exterally thread fasteners whith have a plain(non-plated or non-coated)finish or have a pating or coating of insufficient thickness to necessitate overtapping the nut thread to provide assemblability. Zinc coated nuts intended for use with externally threaded fasteners which are hot-dip zinc coated, mechanically zinc coated, or have a plating or coating of sufficient thickness to necessitate overtapping the nut thread to provide assemblability.

C Nuts made in accordance to the requirements of Specification ASTM A194/A194M, Grade 2 or Grade 2H, and marked with their grade symbol are acceptable equivalents for Grades C and D nuts. When A194 zinc coated inch series nuts are supplied,the zinc coating, overtapping, lubrication and rotation capacity testing shall be in accordance with Specification ASTM A563.

D Nuts made in accordance with the requirement of Specification A194/A194M, Grade 2H, and marked with its grade symbol are an acceptable equivalent for Grade DH nuts. When ASTM A194 zinc coated inch series nuts are supplied, the zinc coating, overtapping, lubrication and rotational capacity testing shall be in accordance with Specification ASTM A563.

Chemical Requirements for Grades O,A,B,C,D, and DH Nuts

Grade of Nut	Composition,%
Grade of Nut	Analysis	Carbon	Manga-nese, min	Posph- orus, max	Sulfur, max
O,A,B,C	heat product	0.55 max 0.58 max	… …	0.12 0.13B	0.15A …
DC	heat product	0.55 max 0.58 max	0.30 0.27	0.04 0.48	0.05 0.058
DHC	heat product	0.20-0.55 0.18-0.58	0.60 0.57	0.04 0.48	0.05 0.058

A For Grades O,A, and B a sulfur content of 0.23% max is acceptable with purchaser's approval.
B Acid-bessemer steel only.
C For Grades D and DH a sulfur content of 0.05-0.15% is acceptable, provided the manganese is 1.35% min.

ASTM DIN ISO Mechanical Properties

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