DIN 934 M20 Hex Nut Class 10
Hex Nut · M20 × 2.5 · Class 10 · Alloy steel, class 10
- Key facts
- Standard
- DIN 934
- Size
- M20
- Thread designation
- M20 × 2.5
- Pitch
- 2.5 mm
- Class
- Class 10
- Material
- Alloy steel, class 10
- Finish
- Zinc plated / Dacromet
Dimensions
Values are taken as published on our spec sheet, not recalculated; tolerances follow the standard execution class.
| Thread size | M20 × 2.5 |
| Pitch P | 2.5 mm |
| Width across flats S | 30 mm |
| Nut thickness m | 18.0 mm |
| Type 2 (heavy) | ≈ 1.2× the type 1 thickness; for class 10.9 and above |
| Length | Nuts have no length parameter — thickness m governs; type 2 is about 1.2× the type 1 thickness |
Mechanical properties
Per GB/T 3098.1 / ISO 898-1 class definitions (stainless per ISO 3506).
| Mating bolt class | 10.9 级（抗拉 1000 MPa 级） |
| Hardness range | 32 – 39 HRC（随配套 10.9 级螺栓） |
| Pairing rule | 10.9 级螺栓配 10 级螺母，或改用 2 型 8 级 |
| Common material | 中碳合金钢 35CrMo |
| Type 1 / Type 2 | 高强场合建议用 2 型加厚螺母 |
| Assembly requirement | 10 级以上电镀件需 190–220°C 保温驱氢 |
Recommended tightening torque
Coarse thread · dry assembly · μ ≈ 0.14 · estimated at 70% of yield strength — reference only; critical joints follow the design document
Factors that change the actual torque: lubrication, finish, washer and bearing surface, re-use.
Nuts carry no separate torque: the figure above is the assembly torque of the mating bolt class and is applied from the bolt side.
DIN / GB / ISO cross reference
Match on the standard number: similarly named parts can differ in width across flats, and superseded DIN standards need an agreed inspection basis.
Applications & mating parts
Mates with DIN933 hex bolts / DIN975 stud bolts; pair same class or one class lower.
Supply information
Multiple diameters and classes can be mixed in one order; batch mill test reports ship with the goods.
- MOQ: 500 pcs (mixed containers accepted)
- Lead time: 3–7 days in stock / 15–25 days custom
- Documents: packing list, invoice, certificate of origin (CO / FORM E / RCEP)
- Terms: FOB Ningbo / Shanghai · CIF · EXW
- Ships with: mill test certificate and inspection report per batch
Adjacent sizes & other classes
Changing class on the same diameter changes material and heat treatment — thread and head dimensions stay the same. Re-check the joint design before substituting.
Other classes, same diameter
Adjacent sizes, same class
Request a quote: DIN 934 M20 Hex Nut Class 10
Send the standard, diameter, class and quantity — price, lead time and a sample MTC within 24 hours.