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13.5 Allowable Torques for Stainless Steel Bolts
Allowable torques for stainless steel bolts (metric)
Scope:
Ozone systems and piping
Property class:
For bolts W18-8 (A2), by ambient temperature, up to length 8 x nominal thread diameter, but
for -50 (the limitation of length is not applicable here):
- 50
- 70
is used by Wedeco
- 80
Coefficient of sliding friction:
µ = 0,10 means very good surface, lubricate
µ = 0,15 means good surface, lubricate or dry
µ = 0,20 means surface black or phosphate, dry
1.
Hexagon bolts ISO 4014 A2-70
With coefficient of sliding friction of µ = 0,15 the following torques arising:
M 7
allowable torque
•
M 10 allowable torque 35 Nm 310 lbf in
•
M 12 allowable torque 60 Nm 531 lbf in
•
M 14 allowable torque 94 Nm 832 lbf in
•
M 16 allowable torque 144 Nm 1275 lbf in
•
M 18 allowable torque 199 Nm 1761 lbf in
•
M 20 allowable torque 281 Nm 2487 lbf in
•
M 24 allowable torque 269 Nm 2381 lbf in
•
2.
Studs DIN 938 A2
Because there is no standardized definition for studs, however, we use the studs in the same
quality like the hexagon bolts, one can go out from the same allowed torques.
M 7
allowable torque
•
M 10 allowable torque 35 Nm
•
M 12 allowable torque 60 Nm
•
M 14 allowable torque 94 Nm
•
M 16 allowable torque 144 Nm 1275 lbf in
•
M 18 allowable torque 199 Nm 1761 lbf in
•
M 20 allowable torque 281 Nm 2487 lbf in
•
M 24 allowable torque 269 Nm 2381 lbf in
•
Manual_SMOevoPLUS_eng_01.2019.doc
Manual Ozone Generating System SMOevo
2 Nm 17.7 lbf in
2 Nm 17.7 lbf in
310 lbf in
531 lbf in
832 lbf in
PLUS
Appendix
page 179 of 179
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