DIN WASHERS
DIN 125 | DIN 127 | DIN 9021 | DIN 6796 | DIN 6916
Manufacturer & Exporter – Super Industries India
1. Introduction to DIN Washers
DIN Washers are load-distribution components used with bolts, screws, and nuts to improve joint performance, protect surfaces, and enhance fastening reliability. Though often considered simple components, washers play a critical engineering role in preventing loosening, reducing surface damage, and maintaining consistent preload.
At Super Industries India, we manufacture and export a complete range of DIN standard washers suitable for structural, pressure, vibration, and heavy-load applications.
Super Industries
Global Manufacturer of Heavy & Custom Engineered Fasteners & Flanges
2. Engineering Functions of Washers
Washers serve multiple purposes in a fastened joint:
- Distribute clamping force evenly
- Prevent damage to base materials
- Reduce friction during tightening
- Provide locking resistance (spring washers)
- Compensate for oversized or slotted holes
Proper washer selection is essential for joint durability and safety.
3. DIN 125 – Plain Washers
Definition
DIN 125 specifies flat, circular washers with standard outer diameter.
Characteristics
- Uniform thickness
- Smooth bearing surface
- Compatible with most bolts & nuts
Applications
- Structural steel connections
- Machinery assembly
- General-purpose fastening
ISO Equivalent
- ISO 7089 / ISO 7090
4. DIN 127 – Spring Lock Washers
Definition
DIN 127 covers split spring washers, designed to prevent loosening under vibration.
Working Principle
- Washer flattens under load
- Creates axial tension
- Provides resistance to rotation
Applications
- Machinery
- Automotive
- Electrical enclosures
Note: Engineers increasingly prefer modern locking solutions, but DIN 127 remains widely used.
Super Industries
Global Manufacturer of Heavy & Custom Engineered Fasteners & Flanges
5. DIN 9021 – Large Outer Diameter Washers
Definition
DIN 9021 specifies washers with large outside diameter, often called penny washers.
Advantages
✔ Covers oversized holes
✔ Distributes load over wider area
✔ Ideal for soft materials
Applications
- Sheet metal
- Timber connections
- Lightweight structures
6. DIN 6796 – Disc Spring Washers
Definition
DIN 6796 specifies conical disc spring washers for high-strength bolted joints.
Engineering Benefits
- Maintains preload under vibration
- Compensates for thermal expansion
- Ideal for high-strength bolts
Applications
- Structural steel
- Wind energy
- Heavy machinery
7. DIN 6916 – Hardened Structural Washers
Definition
DIN 6916 covers hardened washers used with structural bolts.
Key Features
- High hardness
- Designed for use with HV bolt assemblies
- Withstands high clamp loads
Applications
- Bridges
- Steel structures
- Industrial buildings
8. Comparison of DIN Washer Types
| DIN Standard | Type | Function |
|---|---|---|
| DIN 125 | Flat washer | Load distribution |
| DIN 127 | Spring washer | Anti-loosening |
| DIN 9021 | Large OD washer | Surface protection |
| DIN 6796 | Disc spring washer | Preload retention |
| DIN 6916 | Hardened washer | Structural use |
9. Materials Offered
Carbon Steel
- Mild steel
- Hardened steel
Stainless Steel
- AISI 304
- AISI 316
Special Materials
- Alloy steel
- Duplex stainless steel
10. Mechanical Properties
| Washer Type | Hardness |
|---|---|
| DIN 125 | As specified |
| DIN 6796 | High hardness |
| DIN 6916 | Structural grade |
11. Manufacturing Process at Super Industries India
1️⃣ Raw material blanking
2️⃣ Piercing & stamping
3️⃣ Heat treatment (where required)
4️⃣ Surface finishing
5️⃣ Dimensional & hardness inspection
12. Surface Finishes Available
- Plain / Black
- Zinc plated
- Hot dip galvanized
- Phosphate coated
- PTFE coated
13. Quality Control & Testing
✔ Thickness measurement
✔ OD & ID verification
✔ Hardness testing
✔ Visual inspection
✔ EN 10204 3.1 certification
14. Export Packaging
- Bulk wooden crates
- Small boxes
- Palletized shipments
- Customized packing options
15. Industries Served
- Construction & infrastructure
- Power plants
- Oil & gas
- Heavy engineering
16. Why Choose Super Industries India?
✔ DIN-compliant manufacturing
✔ Custom sizes & thickness
✔ Export-quality finishes
✔ Competitive pricing
✔ Global supply capability
17. FAQs – DIN Washers
Q1: When should DIN 6796 washers be used?
In high-strength and vibration-prone joints.
Q2: Can you supply galvanized washers?
Yes, HDG and zinc-plated options available.
Q3: Do you offer custom washer dimensions?
Yes, based on drawings or samples.
18. Request a Quote
For DIN washers, contact:
📧 sales@superindustriesindia.in