SAE Specifications for Steel Bolts
SAE Grade No.	Size Range Inclusive, in	Minimum Proof Strength, kpsi	Minimum Tensile Strength, kpsi	Minimum Yield Strength, kpsi	Material
1	¼ - 1½	33	60	36	Low or medium carbon
2	¼ - ¾ ⅛ - 1½	55 33	74 60	57 36	Low or medium carbon
4	¼ - 1½	65	115	100	Medium carbon, cold-drawn
5	¼ - 1 1⅛ - 1½	85 74	120 105	92 81	Medium carbon, Q&T
5.2	¼ - 1	85	120	92	Low-carbon martensite, Q&T
7	¼ - 1½	105	133	115	Medium-carbon alloy, Q&T
8	¼ - 1½	120	150	130	Medium-carbon alloy, Q&T
8.2	¼ - 1	120	150	130	Low-carbon martensite, Q&T
ASTM Specifications for Steel Bolts
ASTM Designation No.	Size Range Inclusive, in	Minimum Proof Strength, kpsi	Minimum Tensile Strength, kpsi	Minimum Yield Strength, kpsi	Material
A307	¼ - 1½	33	60	36	Low carbon
A325, type 1	½ - 1 1⅛ - 1½	85 74	120 105	92 81	Medium carbon, Q&T
A325, type 2	½ - 1	85 74	120 105	92 81	Low-carbon, martensite, Q&T
A325, type 3	½ - 1 1⅛ - 1½	85 74	120 105	92 81	Weathering steel, Q&T
A354, grade BC	½ - 2½ 2¾ - 4	105 95	125 115	109 99	Alloy steel, Q&T
A354, grade BD	¼ - 4	120	150	130	Alloy steel, Q&T
A449	¼ - 1 1⅛ - 1½ 1¾ - 3	85 74 55	120 105 90	92 81 58	Medium-carbon, Q&T
A490, type 1	½ - 1½	120	150	130	Alloy steel, Q&T
A490, type 3	½ - 1½	120	150	130	Weathering steel, Q&T
Metric Mechanical-Property Classes for Steel Bolts, Screws, and Studs.
Property Class	Size Range Inclusive	Minimum Proof Strength, MPa	Minimum Tensile Strength, MPa	Minimum Yield Strength, MPa	Material
4.6	M5-M36	225	400	240	Low or medium carbon
4.8	M1.6-M16	310	420	340	Low or medium carbon
5.8	M5-M24	380	520	420	Low or medium carbon
8.8	M16-M36	600	830	660	Medium carbon, Q&T
9.8	M1.6-M16	650	900	720	Medium carbon, Q&T
10.9	M5-M36	830	1040	940	Low-carbon martensite, Q&T
12.9	M1.6-M36	970	1220	1100	Alloy, Q&T
ANSI B1.1-1974