Ferrous : Non-Ferrous : Polymers : Ceramics : Bolts : Springs : Thermodynamics : Bending : Stress
Bolt Grades
Bolt Grade
|
Sizes
|
UTS 100 x #1
|
Yield Stress UTS x #2 / 10
|
Proof Load 90%
x Yield
|
Preload 80% x Proof |
Hardness Rockwell
|
|
mm diam
|
MPa
|
MPa
|
MPa
|
MPa
|
Min
|
4.6
|
M5-M100
|
400
|
240
|
216
|
172 |
B67-95
|
4.8
|
M1.6-M16
|
400
|
320
|
288
|
230
|
B71-95
|
5.8
|
M5-M24
|
500
|
400
|
360
|
288
|
B82-95
|
8.8
|
M16-M72
|
800
|
640
|
576
|
460
|
C23-34
|
9.8
|
M1.6-M16
|
900
|
720
|
648
|
518
|
C27-46
|
10.9
|
M5-M100
|
1000
|
900
|
810
|
648
|
C33-49
|
12.9
|
M1.6-M100
|
1200
|
1080
|
972
|
777
|
C38-44
|
Proof Load:(MPa)
Stress that the bolt must withstand without evidence of any
permanent set, usually about 90% or Yield Strength..
Proof Stress:(MPa) The stress
that produces a
certain strain, typically 0.2%. Used for materials that do not
have a definite yield point.
PreLoad Stress:(MPa) The stress
that a bolt is
normally tensioned up to. Typically 80% of the stress Proof
Load,
which is 72% of Yield.
Note: These are NOT THE SAME! Proof Stress is above the Yield Stress, but Proof Load is below it.
Table 2: MEASURED
TYPICAL BOLT
PROPERTIES: Source: ISO
898-1, 1999, Sections 3 through 7, and App. A.
(Do NOT use these for calculations)
Bolt Grade
|
Sizes
|
UTS
|
Yield
Stress
|
Proof
Load
|
Hardness Rockwell
|
|
mm diam
|
MPa
|
MPa
|
MPa
|
Min
|
4.6
|
M5-M100
|
400
|
240
|
225
|
B67-95
|
4.8
|
M1.6-M16
|
420
|
340
|
310
|
B71-95
|
5.8
|
M5-M24
|
520
|
420
|
380
|
B82-95
|
8.8
|
M16-M72
|
830
|
660
|
600
|
C23-34
|
9.8
|
M1.6-M16
|
900
|
720
|
650
|
C27-46
|
10.9
|
M5-M100
|
1040
|
940
|
830
|
C33-49
|
12.9
|
M1.6-M100
|
1220
|
1100
|
970
|
C38-44
|
Links
Bolted Joints: http://www.roymech.co.uk/Useful_Tables/Screws/Preloading.html
Material Properties: