SAE Grade ASTM Bolt Identify Marks Mechanical Properties

Bolt Grade Identification Marking	Specification	Nominal Size   (inch)	Proof Load Stress   (ksi)	Tensile Strength   (min ksi)	Material Notes
	SAE Grade 1	1/4 to 1 1/2	33	60	1
	SAE Grade 2	1/4 thru 3/4	55	74
		over 3/4 thru 1-1/2	33	60
	ASTM A307	1/4 to 1 1/2	33	60	3
	SAE Grade 4	1/4 to 1 1/2	65	115	2,a
	SAE - Grade 5	1/4 thru 1	85	120	2, b
	ASTM A449 - Type 1	1 1/8  thru 1-1/2	74	105
		1 3/4 thru 3	55	90
	SAE - Grade 5.2	1/4 thru 1	85	120	4, b
	ASTM A325 - Type 1	1/2 thru 1	85	120	2, b
		1 1/8 to 1-1/2	74	105
	ASTM A325 - Type 2	1/2 thru 1	85	120	4,b
		1 1/8 to 1-1/2	74	105
	ASTM A325 - Type 3	1/2 thru 1	85	120	5,b
		1 1/8 to 1-1/2	74	105
	ASTM A354 - Grade BC	1/4 thru 2-1/2	105	125	5,b
		2-3/4 thru 4	95	115
	SAE Grade 7	1/4 to 1 1/2	105	133	7,b
	SAE - Grade 8	1/4 thru 1-1/2	120	150	7,b
	ASTM A354 - Grade BD	1/4 thru 1-1/2	120	150	6,b
	SAE - Grade 8.2	1/4 thru 1	120	150	4,b
	ASTM A490 - Type 1	1/2 thru 1-1/2	120	150	6,b
	ASTM A490 - Type 3	1/2 thru 1-1/2	120	150	5,b

1. Low or Medium Carbon Steel
2. Medium Carbon Steel
3. Low Carbon
4. Low Carbon Martensite
5. Weathering Steel
6. Alloy Steel
7. Medium Carbon Alloy

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