Fastener Identification Markings

	NO MARKINGS	NO MARKINGS
Specification	SAE J429 Grade 1	SAE J429 Grade 2
Material	Low or Medium Carbon Steel	Low or Medium Carbon Steel
Nominal Sizes	1/4” through 1-1/2”	1/4” through 3/4”	over 3/4” through 1-1/2”
Proof Load Stress	33 ksi	55 ksi	33 ksi
Min. Tensile Strength	60 ksi	74 ksi	60 ksi
Min. Hardness Rockwell	B70	B80	B70
Max. Hardness Rockwell	B100	B100	B100

	307A	307B
Specification	ASTM A307 Grade A	ASTM A307 Grade B
Material	Low or Medium Carbon Steel	Low or Medium Carbon Steel
Nominal Sizes	1/4” through 4”	1/4” through 4”
Proof Load Stress	-	-
Min. Tensile Strength	60 ksi	60 ksi min. 100 ksi max.
Min. Hardness Rockwell	B69	B69
Max. Hardness Rockwell	B100	B95

	THREE LINES		THREE LINES
Specification	SAE J429 Grade 5		ASTM A449 Type 1
Material	Medium Carbon Steel Quenched and Tempered		Medium Carbon Steel Quenched and Tempered
Nominal Sizes	1/4” through 1”	over 1 through 1-1/2”	1/4” through 1”	over 1 through 1-1/2”
Proof Load Stress	85 ksi	74 ksi	85 ksi	74 ksi
Min. Tensile Strength	120 ksi	105 ksi	120 ksi	105 ksi
Min. Hardness Rockwell	C25	C19	C25	C19
Max. Hardness Rockwell	C34	C30	C34	C30

	SIX LINES	SIX LINES
Specification	SAE J429 Grade 8	ASTM A354 Grade BD
Material	Medium Carbon Alloy Steel Quenched and Tempered	Medium Carbon Alloy Steel Quenched and Tempered
Nominal Sizes	1/4” through 1-1/2”	1/4” through 1-1/2”	over 2-1/2” through 4”
Proof Load Stress	120 ksi	120 ksi	105 ksi
Min. Tensile Strength	150 ksi	150 ksi	140 ksi
Min. Hardness Rockwell	C33	C33	C33
Max. Hardness Rockwell	C39	C39	C39

	A325		THREE LINES & A325
Specification	ASTM A325 Type 1		ASTM A325 Type 2
Material	Medium Carbon Steel, Quenched and Tempered		Low Carbon Martensite Steel, Quenched and Tempered
Nominal Sizes	1/2” through 1”	over 1 through 1-1/2”	1/2” through 1”	over 1 through 1-1/2”
Proof Load Stress	85 ksi	74 ksi	85 ksi	74 ksi
Min. Tensile Strength	120 ksi	105 ksi	120 ksi	105 ksi
Min. Hardness Rockwell	C24	C19	C24	C19
Max. Hardness Rockwell	C35	C31	C35	C31

	A490	A490 UNDERLINED	SIX LINES & A490
Specification	ASTM A490 Type 1	ASTM A490 Type 2	ASTM A490 Type 3
Material	Medium Carbon Alloy Steel, Quenched and Tempered	Low Carbon Martensite Steel, Quenched and Tempered	Atmospheric Corrosion Resistant Steel, Quenched and Tempered
Nominal Sizes	1/2” through 1-1/2”	1/2” through 1”	1/2” through 1-1/2”
Proof Load Stress	120 ksi	120 ksi	120 ksi
Tensile Strength	150 ksi Min. 170 ksi Max.	150 ksi Min. 170 ksi Max.	150 ksi Min. 170 ksi Max.
Min. Hardness Rockwell	C33	C33	C33
Max. Hardness Rockwell	C38	C38	C38

Please Note:
The above specifications are offered as a guide ONLY. Specifications should be determined with assembly conditions taken into account.