Mechanical Property References
SAE
GradeDiameter
(in)Proof
Strength
(ksi)Minimum
Tensile
Strength
(ksi)Rockwell
HardnessMaterial and
Heat TreatmentGrade 2 0.25 - 0.75
0.75 - 1.555
3374
60B80 - B100
B70 - B100Low or medium carbon steel Grade 5 0.25 - 1
1- 1.585
74120
105C25 - C34
C19 - C30Medium carbon steel, quenched and tempered Grade 8 0.25 - 1.5 120 150 C33 - C39 Medium carbon alloy steel, quenched and tempered from http://www.incomsupply.com/customers/specdata/cap.html
from Mechanical Engineering Design, 5th Ed., by J.E. Shigley and C.R. Michke, McGraw-Hill, 1989, p348
SAE Specifications for Steel Bolts
SAE
Grade
No.Size
Range
(in)Minimum
Proof
Strength
(ksi)Minimum
Yield
Strength
(ksi)Minimum
Tensile
Strength
(ksi)Material Head
Marking1 0.25 - 1.5 33 36 60 Low or medium carbon 2 0.25 - 0.75
0.875 - 1.555
3357
3674
60Low or medium carbon 4 0.25 - 1.5 65 100 115 Medium carbon, cold-drawn 5 0.25 - 1
1.125 - 1.585
7492
81120
105Medium carbon, Q&T 5.2 0.25 - 1 85 92 120 Low-carbon martensite, Q&T 7 0.25 - 1.5 105 115 133 Medium-carbon alloy, Q&T 8 0.25 - 1.5 120 130 150 Medium-carbon alloy, Q&T 8.2 0.25 - 1 120 130 150 Low-carbon martensite, Q&T from Mechanical Engineering Design, 5th Ed, by Shigley & Mischke, McGraw-Hill, 1989, p 341
ASTM Specifications for Steel Bolts
ASTM
Designation
No.Size
Range
(in)Minimum
Proof
Strength
(ksi)Minimum
Yield
Strength
(ksi)Minimum
Tensile
Strength
(ksi)Material Head
MarkingA307 0.25 - 1.5 33 36 60 Low carbon A325, type 1 0.5 - 1
1.125 - 1.585
7492
81120
105Medium carbon, Q&T A325, type 2 0.5 - 1
1.125 - 1.585
7492
81120
105Low-carbon martensite, Q&T A325, type 3 0.25 - 1
1.125 - 1.585
7492
81120
105Weathering steel, Q&T A354, grade BC Alloy steel, Q&T A354, grade BD 0.25 - 4 120 130 150 Alloy steel, Q&T A449 0.25 - 1
1.125 - 1.5
1.75 - 385
74
5592
81
58120
105
90Medium carbon, Q&T A490, type 1 0.5 - 1.5 120 130 150 Alloy steel, Q&T A 490, type 3 Weathering steel, Q&T from Mechanical Engineering Design, 5th Ed, by Shigley & Mischke, McGraw-Hill, 1989, p 342. Refer to ASTM F1077 for more details.
Metric Mechanical-Property Classes for Steel Bolts, Screws, and Studs*
Property
ClassSize
RangeMinimum
Proof
Strength
(MPa)Minimum
Yield
Strength
(MPa)Minimum
Tensile
Strength
(MPa)Material Head
Marking4.6 M5-M36 225 240 400 Low or medium carbon 4.8 M1.6-M16 310 340 420 Low or medium carbon 5.8 M5-M24 380 420 520 Medium carbon, cold-drawn 8.8 M16-M36 600 660 830 Medium carbon, Q&T 9.8 M1.6-M16 650 720 900 Low-carbon martensite, Q&T 10.9 M5-M36 830 940 1040 Medium-carbon alloy, Q&T 12.9 M1.6-M36 970 1100 1220 Medium-carbon alloy, Q&T from Mechanical Engineering Design, 5th Ed, by Shigley & Mischke, McGraw-Hill, 1989, p 343
*The thread length for bolts and cap screws is LT = 2d+6 for L<125, 2d+12 for 125<L<200, 2d+25 for L>200 where L is the bolt length. The thread length for structural bolts is slightly shorter than given above.