DIN 934 M20 Hex Nut A4-80
Hex Nut · M20 × 2.5 · A4-80 · Stainless steel 316
- Key facts
- Standard
- DIN 934
- Size
- M20
- Thread designation
- M20 × 2.5
- Pitch
- 2.5 mm
- Class
- A4-80
- Material
- Stainless steel 316
- 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 | 800 MPa（按 ISO 3506 / GB/T 3098.6 等级号 A4-80） |
| Yield guarantee | 低于 8.8 级，腐蚀环境承力需重新核算 |
| Common material | Austenitic stainless 316 / 316L (16Cr-10Ni-2~3Mo) |
| Pitting equivalent PREN | 约 24 – 26（比 304 高约 35%） |
| Corrosion resistance | 优秀（抗氯离子）：海岸、盐雾、化工、船舶首选 |
| Strength ceiling | 316 达不到 10.9 级；既需高强又要耐蚀请改达克罗碳钢 |
Recommended tightening torque
Torque data for this class — please confirm by phone
Our torque chart only covers classes 8.8 / 10.9 / A2-70. No value is published for 12.9 or A4-80, so nothing is estimated or invented here. Send the finish and lubrication condition and we calibrate the torque for the batch.
Request a quoteDIN / 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Match on the standard number: similarly named parts can differ in width across flats, and superseded DIN standards need an agreed inspection basis.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 A4-80
Send the standard, diameter, class and quantity — price, lead time and a sample MTC within 24 hours.