DIN 9021 Large Plain Washer Manufacturer | Big Outside Diameter Flat Washer | Metric Fender Washer | GFM-WCR System
DIN 9021 Plain Washer (Large Outside Diameter) Manufacturer
LONGZE DIN 9021 Plain Washers, also known as large series washers, feature an outside diameter approximately three times the nominal thread diameter. As a specialized component of the LONGZE Engineered Fastening System, these washers provide an oversized bearing surface to distribute high clamping loads on soft materials, thin sheet metals, and timber constructions. Manufactured to rigorous metric standards, our DIN 9021 washers ensure maximum surface protection and joint stability in demanding structural applications.
Optimal factory-direct assembly for extended surface load distribution:
- 🔹 Bolt: DIN 933 / DIN 603 Carriage Bolts
- 🔹 Standard Washer: DIN 125 / ISO 7089
- 🔹 Hex Nut: DIN 934 / DIN 985 Nylon Lock Nut
LONGZE GLOBAL FASTENERS STANDARDS SYSTEM
Engineering Standard Mapping Layer (DIN → ISO → ASME)
LONGZE Technical Specification & Performance Lab
Engineering Reliability Center: Systematic verification of surface flatness, metallurgical hardness, and dimensional concentricity for oversized bearing applications.
1. Technical HUB
| Range | M3 – M36 |
| Materials | Carbon Steel / SS304 / SS316 |
| Series | Large Series (Form A) |
| Standards | DIN 9021 / ISO 7093 |
| Hardness | 100HV / 140HV / 200HV |
2. Surface Lab
| Plain | Anti-rust Oil Treatment |
| Zinc Plated | Blue-White / Yellow Cr3+ |
| HDG | ISO 1461 Hot-Dip |
| Black Coating | Black Zinc / Black Oxide |
| Specialty | Dacromet / Ruspert |
3. QC Lab
| Concentricity | Gage Center Check |
| Edge Quality | Visual Burr Inspection |
| Dimensions | Digital Caliper Verify |
| Salt Spray | Tested per Batch |
| Certificates | EN 10204 3.1 MTC |
📊 DIN 9021 Dimensional Matrix (Large Series)
Dimensional Compliance Matrix: Standardized geometric data for large outside diameter washers ($d_{2} \approx 3 \times$ thread diameter). All values are in millimeters (mm).
📥 DOWNLOAD OFFICIAL TECHNICAL DATA SHEET (TDS)
🛡️ LONGZE STRATEGIC RISK MANAGEMENT & RESILIENCE
Advanced mitigation protocols designed to protect global procurement chains from technical, logistical, and structural failures.
- Technical Risk: High-precision punching dies prevent excessive dishing or bowing on large diameters.
- Surface Risk: Batch-tested coatings ensure uniform coverage across the expansive surface area.
- Material Risk: Strict carbon content control to maintain required tensile strength without brittleness.
- Logistics Risk: Reinforced carton-and-pallet system handles the extreme bulk weight of large-series washers.
- Redundancy: Multiple high-tonnage automated press lines ensure uninterrupted batch supply.
- Customization: Capability to adjust ID/OD ratios for specific architectural or automotive assembly needs.
- Efficiency: GFM-WCR tracking system connects batch production to global shipping IDs.
- Global REACH: Full compliance with RoHS and REACH environmental directives for international entry.
Customized Fastening Solutions & Drawing Support
You can send me technical drawings or specific large-diameter requirements, and I will provide you with free technical solutions and optimization suggestions.
* Proposals for reference; final specs per customer approval.
Quality Assurance & Global Logistics Risk Control
Our dual-protection framework transforms international procurement risks into manageable engineering variables through strict legal compliance and transparent logistics evidence.
Q: What if the washer flatness or $d_{2}$ tolerance is out of DIN 9021 spec?
A: Quality is our red line. Any deviation from the signed Technical Data Sheet (TDS) is subject to 100% replacement or financial adjustment. We guarantee structural reliability for every order.
Q: How do you manage the heavy tonnage associated with oversized flat washers during transport?
A: We utilize heavy-gauge industrial packaging and reinforced pallets. Full photographic loading records ensure that your high-tonnage cargo is balanced and secured for global shipping.
V-SYSTEM Interconnectivity Matrix
The V-SYSTEM provides a synchronized data bridge between technical standards, procurement logic, and surface engineering. SYSTEM STATUS: TESTING IN PROGRESS
Direct Factory Connection & Technical Support
Bridge the gap between engineering requirements and manufacturing precision. Contact our director-level technical desk for immediate RFQ processing and material consulting.
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