DIN 934 M20 Hex Nut A2-70
Hex Nut · M20 × 2.5 · A2-70 · Stainless steel 304
- Key facts
- Standard
- DIN 934
- Size
- M20
- Thread designation
- M20 × 2.5
- Pitch
- 2.5 mm
- Class
- A2-70
- Material
- Stainless steel 304
- Finish
- Cleaned & passivated
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).
| Nominal tensile strength | 700 MPa |
| Yield guarantee | 无 8.8 级同等屈服保证，不能替代 8.8 级承力 |
| Common material | Austenitic stainless 304 / 304L (18Cr-8Ni, no molybdenum) |
| Pitting equivalent PREN | ≈ 18 – 20 |
| Corrosion resistance | 良好：室内干燥与内陆户外足够；氯离子环境会点蚀 |
| Failure risk | 含氯水环境 > 60°C 有应力腐蚀开裂风险 |
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.
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Match on the standard number: similarly named parts can differ in width across flats, and superseded DIN standards need an agreed inspection basis.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 A2-70
Send the standard, diameter, class and quantity — price, lead time and a sample MTC within 24 hours.