On the bench specifying M20 Threaded Rod — ISO / DIN (Series 153)? This page gives the controlling dimensions for the M20 size of Threaded Rod — ISO / DIN (Series 153) (to ISO / DIN).
M20 Dimensional Row (ISO / DIN)
| Thread size | Pitch (mm) | Length L (mm) | Engagement depth bm (mm) | Material | Reference standard |
|---|---|---|---|---|---|
| M20 | 2.5 | 180 | 30 | Cl. 8.8 alloy steel | DIN 939 / GB/T 901 |
Spanner & Drive for M20 Threaded Rod — ISO / DIN (Series 153)
Drive geometry for M20 Threaded Rod — ISO / DIN (Series 153) 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 Threaded Rod — ISO / DIN (Series 153)
M20 Threaded Rod — ISO / DIN (Series 153) are commonly specified for structural steelwork, heavy machinery foundations and large flange joints.
Installation Tips for M20 Threaded Rod — ISO / DIN (Series 153)
- 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.