Stainless Steel Bolt Torque Chart: A2-70, A4-70 and A4-80 Explained
Stainless Steel Bolt Torque Chart: A2-70, A4-70 and A4-80 Explained
Stainless Steel Bolt Torque Chart provides dry tightening torque reference values for A2-70, A4-70, and A4-80 metric stainless bolts ranging from M3 to M20. The chart includes guidance on lubrication and preload considerations for proper bolt tightening. These values are reference figures for clean, dry, coarse metric threads and are not a design specification.
- The torque chart covers three common stainless steel grades: A2-70, A4-70, and A4-80.
- Torque values are provided for clean, dry, coarse metric threads.
- The values are reference values, not design specifications.
- Lubrication, anti-seize, surface finish, joint stiffness, and required preload can change the correct setting substantially.
Article Content
An M8 A2-70 or A4-70 stainless bolt has a general dry tightening value of about 25 Nm, while M10 is about 50 Nm and M12 about 88 Nm. For A4-80 stainless steel, the equivalent guide values are higher: 32 Nm for M8, 69 Nm for M10, and 117 Nm for M12.
- The torque figures are reference values for clean, dry, coarse metric threads.
- These values are not a design specification and must not be used as such.
- Lubrication, anti-seize, surface finish, joint stiffness, and required preload can change the correct setting substantially.
- For structural, pressure, lifting, or other critical applications, proper engineering analysis is required.
Facts Index
| Entity | Attribute | Value | Confidence |
|---|---|---|---|
| Stainless Steel Bolt Torque Chart: A2-70, A4-70 and A4-80 Explained | author | Simfix Team | high |
| Stainless Steel Bolt Torque Chart: A2-70, A4-70 and A4-80 Explained | publish_date | 2026-08-04T20:01:15Z | high |
Who Is This For
- Engineers and technicians who need proper dry tightening torque reference values for A2-70, A4-70, and A4-80 stainless steel bolts.
- DIY enthusiasts and mechanics working with metric stainless steel fasteners in non-critical applications.
- Professionals requiring guidance on how lubrication, anti-seize, surface finish, joint stiffness, and preload affect torque settings.
Frequently Asked Questions
What is the dry tightening torque for an M8 A2-70 or A4-70 stainless steel bolt?An M8 A2-70 or A4-70 stainless steel bolt has a general dry tightening torque value of about 25 Nm.
What are the dry tightening torque values for M10 and M12 stainless steel bolts?For A2-70 or A4-70 stainless steel, M10 is about 50 Nm and M12 is about 88 Nm. For A4-80 stainless steel, M10 is 69 Nm and M12 is 117 Nm.
What factors can affect the correct torque setting for stainless steel bolts?Lubrication, anti-seize, surface finish, joint stiffness, and the required preload can all change the correct torque setting substantially.
Who wrote the Stainless Steel Bolt Torque Chart article?The Stainless Steel Bolt Torque Chart article was written by the Simfix Team.
When was the Stainless Steel Bolt Torque Chart article published?The Stainless Steel Bolt Torque Chart article was published on 2026-08-04.