Mechanical Property References
SAE
Grade |
Diameter
(in) |
Proof
Strength
(ksi) |
Minimum
Tensile
Strength
(ksi) |
Rockwell
Hardness |
Material and
Heat Treatment |
| Grade 2 |
0.25 - 0.75
0.75 - 1.5 |
55
33 |
74
60 |
B80 - B100
B70 - B100 |
Low or medium carbon steel |
| Grade 5 |
0.25 - 1
1- 1.5 |
85
74 |
120
105 |
C25 - C34
C19 - C30 |
Medium 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
Marking |
| 1 |
0.25 - 1.5 |
33 |
36 |
60 |
Low or medium carbon |
 |
| 2 |
0.25 - 0.75
0.875 - 1.5 |
55
33 |
57
36 |
74
60 |
Low or medium carbon |
|
| 4 |
0.25 - 1.5 |
65 |
100 |
115 |
Medium carbon, cold-drawn |
|
| 5 |
0.25 - 1
1.125 - 1.5 |
85
74 |
92
81 |
120
105 |
Medium 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
Marking |
| A307 |
0.25 - 1.5 |
33 |
36 |
60 |
Low carbon |
|
| A325, type 1 |
0.5 - 1
1.125 - 1.5 |
85
74 |
92
81 |
120
105 |
Medium carbon, Q&T |
 |
| A325, type 2 |
0.5 - 1
1.125 - 1.5 |
85
74 |
92
81 |
120
105 |
Low-carbon martensite, Q&T |
 |
| A325, type 3 |
0.25 - 1
1.125 - 1.5 |
85
74 |
92
81 |
120
105 |
Weathering 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 - 3 |
85
74
55 |
92
81
58 |
120
105
90 |
Medium 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
Class |
Size
Range |
Minimum
Proof
Strength
(MPa) |
Minimum
Yield
Strength
(MPa) |
Minimum
Tensile
Strength
(MPa) |
Material |
Head
Marking |
| 4.6 |
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.