Hexagon Thin Nuts (DIN 439) – 304 (A2-70) Stainless Steel Jam Nuts
Our 304 (A2-70) stainless steel hexagon thin nuts are manufactured to DIN 439 / GB 6172.1 with a reduced nut height for use as jam nuts, locknuts and in tight-clearance assemblies. The A2-70 grade offers excellent corrosion resistance in outdoor, marine and chemical environments.
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | DIN 439 / GB 6172.1 |
| Nut Type | Hexagon Thin Nut (Jam Nut), reduced height |
| Thread | M3 – M24 (Metric Coarse, Right Hand) |
| Material | A2-70 (304) Stainless Steel |
| Property Class | 70 |
| Surface Finish | Passivated |
| MOQ | 5,000 pcs (M3–M12), 1,000 pcs (M14+) |
| Lead Time | 5-12 days (standard), 15-25 days (custom) |
| Packaging | Bulk in cartons / Plastic bags / Custom labeling |
Applications
- Jam-nut locking (two thin nuts or thin + standard nut)
- Low-profile fastening in tight-clearance assemblies
- Instrumentation and precision equipment
- Food processing and chemical equipment
- Marine hardware and outdoor installations
Certifications
ISO 9001:2015 certified manufacturing. Material test certificates (MTC) per EN 10204 3.1 available on request. RoHS and REACH compliant.
Frequently Asked Questions
What is a thin nut (jam nut) used for?
A thin nut has roughly two-thirds the height of a standard hex nut. It is used as a jam nut — tightened against a standard nut to lock the assembly against vibration — or wherever the assembly has limited vertical clearance and a full-height nut will not fit.
What does A2-70 mean?
A2 is the ISO designation for 304 austenitic stainless steel, and 70 is the property class, indicating a minimum tensile strength of 700 MPa. A2-70 combines good corrosion resistance with high-strength performance.
What is the difference between DIN 439 and DIN 934?
DIN 934 is the full-height standard hex nut for general bolting. DIN 439 is the reduced-height (thin) version, used for jam-nut locking, adjustment and low-clearance positions where a full-height nut is unnecessary.
Do you provide material certificates?
Yes. Material test certificates per EN 10204 3.1 are available on request, and our manufacturing is ISO 9001:2015 certified. RoHS and REACH compliance documentation can also be provided.