A studs & threaded rod in M20: this guide pulls the row from the standard, adds the assembly numbers an engineer actually uses, and links you straight to a quote.
M20 Dimensional Row (DIN 939 / DIN 975)
| Thread size | Pitch (mm) | Point type | Common lengths (mm) | Reference standard | Notes |
|---|---|---|---|---|---|
| M20 | 2.5 | M20 | 45~300 | DIN 939 | Stud, equal thread both ends |
Spanner & Drive for M20 Studs & Threaded Rods
Drive geometry for M20 Studs & Threaded Rods is given by the row above; match the tool to the listed values.
Hole Sizes for M20
| Coarse-thread pitch (ISO 724) | 2.5 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 22 mm |
| Tapping drill, coarse thread | 17.5 mm |
Tightening Torque for M20
| Class 8.8 (dry, ~µ 0.125) | ≈ 410 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 580 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 690 Nm |
Indicative dry-joint values. Lubrication can lower the required torque by 15–25%. Always confirm against the joint design, especially when going up a strength class.
Common Applications for M20 Studs & Threaded Rods
M20 Studs & Threaded Rods are commonly specified for structural steelwork, heavy machinery foundations and large flange joints.
Installation Tips for M20 Studs & Threaded Rods
- At M20 the stretch in the bolt becomes the controlling factor — for critical joints, use angle-controlled or stretch-controlled tightening instead of pure torque.
Mating Parts for M20
For M20, pair with a M20 hex nut (ISO 4032 / DIN 934) and, where used, a M20 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.