DIN 9021
DIN 9021 Large Diameter Flat Washers (also known as Penny Washers or Fender Washers) feature an outer diameter approximately three times larger than their inner bore. This massive surface area drastically improves load distribution, making them indispensable when fastening pliable, thin, or easily damaged materials. Our manufacturing expertise ensures these oversized washers are stamped completely flat, free of warping, and cleanly deburred. We supply robust DIN 9021 washers to global distributors catering to the timber, automotive, and sheet metal industries.
Key Dimensions & Scope
- Outer diameter (OD) ≈ 3 x Inner diameter (ID)
- Sizes available to accommodate M3 through M36 bolts
- Thicker profile compared to standard DIN 125 washers
- Precision stamped to avoid surface warping or cupping
- Smooth edges to prevent cutting into soft substrates
Common Grades & Materials
- Carbon Steel (Grade 100 HV to 200 HV)
- Stainless Steel (A2, A4) for external weathering
- Hot-dip galvanized steel for heavy timber construction
Typical Applications
- Fastening thin sheet metal or auto body panels
- Timber construction and wood framing (prevents pulling through)
- Installing soft plastics, fiberglass, or insulation boarding
Equivalent Standards
- ISO 7093-1 (200 HV) ↔ DIN 9021
- ISO 7093-2 (100 HV) ↔ DIN 9021
Frequently Asked Questions: DIN 9021
DIN 9021 vs DIN 440 (Timber Washers)
| Feature | DIN 9021 (Penny Washer) | DIN 440 (Timber Washer) |
|---|---|---|
| Hole Size (ID) | Standard clearance for machine bolts | Slightly oversized, often used with wood/coach screws |
| Outer Diameter | Approx 3x the thread diameter | Extremely wide surface area specifically for wood grain |
| Shape variants | Round only | Available as Round (Form R) or Square (Form V) |
| Primary Market | Sheet metal, auto-body, general use | Heavy structural timber framing and carpentry |
Factory Quality & Inspection Protocols
Our adherence to ISO 9001:2015 means every production batch of DIN 9021 undergoes rigorous metallurgical and dimensional testing in our in-house laboratory prior to global export.
- Stamping Press Force Monitor: Real-time tonnage monitoring during the stamping process to prevent micro-cracking in the extreme outer diameter.
- Surface Evenness: Checked on granite surface plates to assure the large footprint remains perfectly flush without warping (cupping).
- Corrosion Resistance: Extensive ASTM B117 salt spray testing for Hot-Dip Galvanized batches, mandatory for outdoor timber environments.
- Hardness Classes: Segregated production runs ensuring 100 HV variants for standard use and 200 HV variants for high-load structural use.
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Typical Applications for DIN 9021 Fasteners
Structural Construction
DIN 9021 bolts are widely used in steel frame assemblies, bridges, and heavy structural joints requiring reliable clamping force.
Industrial Machinery
Suitable for general machinery, conveyor systems, flanged connections, and equipment assemblies where vibration resistance is essential.
Marine & Energy
Used in shipbuilding, offshore platforms, wind turbine towers and solar panel mounting structures with corrosion-resistant coatings.
Quality Assurance & Testing
- Hardness testing (Vickers / Rockwell) per ISO 898-1
- Dimensional control with CMM and thread gauges
- Salt spray corrosion testing (500–1000h)
- Tensile and proof load testing per batch
- Full traceability — heat number, mill certificates
- ISO 9001:2015 certified manufacturing facility
DIN 9021 — Available Variants
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