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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

When you apply high torque to a bolt against a soft material (like wood or thin aluminum), the bolt head can crush or pull completely through the material. The 3x outer diameter of DIN 9021 spreads that clamping force over a much wider area, preventing damage.

Yes, provided they are manufactured from the correct hardness class (such as 200 HV) and paired with appropriate structural bolts. They are widely used in structural timber connections.

Absolutely. We frequently export DIN 9021 washers with Hot-Dip Galvanized (HDG) coatings, which are highly demanded for outdoor construction and roofing applications where superior rust protection is required.

DIN 9021 vs DIN 440 (Timber Washers)

FeatureDIN 9021 (Penny Washer)DIN 440 (Timber Washer)
Hole Size (ID)Standard clearance for machine boltsSlightly oversized, often used with wood/coach screws
Outer DiameterApprox 3x the thread diameterExtremely wide surface area specifically for wood grain
Shape variantsRound onlyAvailable as Round (Form R) or Square (Form V)
Primary MarketSheet metal, auto-body, general useHeavy 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.

Require DIN 9021 Fasteners in Bulk?

Our Turkey-based manufacturing facility offers ultra-competitive pricing, fast global shipping, and strict ISO 9001:2015 quality control for DIN 9021.

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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

Materials
A2 · A4 · 8.8 · 10.9
Coatings
Zinc · HDG · Dacromet
Sizes
M4 – M72
MOQ
From 100 pcs

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ISO 9001:2015
EN 10204 3.1
41+ Countries
Factory Since 1978
DIN · ISO · ASTM
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