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DIN 436 Square Washer for Wood Construction – HDG

DIN 436 Square Washer for Wood Construction — Low Carbon Steel, Hot-Dip Galvanized (HDG)

FULLERKREG DIN 436 square flat washers are manufactured to DIN 436 standard in low carbon steel with hot-dip galvanizing (HDG) per ISO 1461. DIN 436 square washers feature a large square external shape providing a significantly larger bearing area than conventional round washers — essential for wood construction, timber framing, and seismic applications where pull-through resistance is critical. Hot-dip galvanizing provides a thick, metallurgically bonded zinc coating (45–85 μm) with excellent long-term corrosion protection for outdoor structural applications — the industry-standard surface treatment for heavy-duty timber construction hardware. The HDG coating is self-healing at cut edges and scratches, providing cathodic protection to the base steel.

Product Highlights

  • Standard: DIN 436 (Square Flat Washer for Wood Construction)
  • Material: Low Carbon Steel (Q235 / S235 equivalent)
  • Surface Treatment: Hot-Dip Galvanizing (HDG) per ISO 1461
  • Zinc Coating Thickness: 45–85 μm (metallurgically bonded)
  • Size Range: M10 – M52
  • Profile: Square — large bearing area, prevents rotation, distributes load over wide surface
  • Cathodic protection: HDG zinc sacrificially protects base steel at cut edges and scratches
  • Industry standard for heavy-duty outdoor timber construction hardware
  • RoHS & REACH Compliant

Dimensional Specifications — DIN 436 Square Washer, Low Carbon Steel HDG

All dimensions in millimeters (mm). Per DIN 436. Note: HDG coating adds 45–85 μm per surface — allow for coating thickness in precision fits.

For Thread d1 min d1 max a nom a min a max h nom h min h max
M10 11 11.43 30 28.7 30 3 2.4 3.6
M12 13 13.5 40 38.4 40 4 3.4 4.6
M16 17.5 18.2 50 48.4 50 4 3.4 4.6
M20 22 22.84 60 58.1 60 4 3.4 4.6
M22 24 24.84 70 68.1 70 5 4 5
M24 26 26.84 80 78.1 80 5 4 5
M27 30 30.84 90 87.8 90 5 4 5
M30 33 34 95 92.8 95 6 5 6.8
M33 36 37 100 97.8 100 6 5 6.8
M36 39 40 110 107.8 110 6 5 6.8
M39 42 43 120 117.5 120 8 6.8 8
M42 45 46 130 127.5 130 8 6.8 8
M45 48 49 140 137.5 140 8 6.8 8
M48 52 53.2 150 147.5 150 8 6.8 8.8
M52 56 57.2 160 157.5 160 10 8.8 11.2

All dimensions in mm per DIN 436. d1 = inner hole diameter; a = square side length; h = washer thickness (before HDG). HDG adds 45–85 μm per surface.

HDG vs. Stainless Steel — Surface Treatment Comparison

Property HDG (This Product) A2 Stainless (SUS304) A4 Stainless (SUS316)
Coating type Hot-dip zinc (metallurgically bonded) Passive oxide layer Passive oxide layer + Mo
Zinc thickness 45–85 μm N/A N/A
Cathodic protection Yes — zinc sacrifices to protect steel No No
Corrosion resistance Excellent — outdoor structural Good — general outdoor Excellent — marine grade
Cost Most economical Medium Higher
Best for Heavy-duty outdoor timber, structural General outdoor, food-safe Marine, coastal, seawater

Hot-Dip Galvanizing (HDG) — Technical Details

Property Value
Process Standard ISO 1461 (Hot-Dip Galvanizing)
Zinc Coating Thickness 45–85 μm (metallurgically bonded Fe-Zn alloy layers)
Bonding mechanism Metallurgical — zinc diffuses into steel surface
Cathodic protection Yes — zinc sacrificially protects base steel
Self-healing Yes — zinc oxide forms at cut edges and scratches
Expected service life 25–50+ years in typical outdoor environments
Operating Temperature -40°C to +200°C (zinc coating stable)
RoHS / REACH Compliant

DIN 436 Square Washer vs. Standard Round Washer

Feature DIN 436 (Square) Standard Round Washer (DIN 125)
Shape Square Round
Bearing area Much larger — full square surface Standard annular area
Pull-through resistance High — ideal for timber Standard
Rotation prevention Yes — square profile locks in timber grain No
Primary use Wood construction, timber framing, structural General bolted assemblies

Application Scenarios

  • Heavy timber frame construction — large square bearing area, HDG for long-term outdoor durability
  • Outdoor wooden structures — decking, pergolas, bridges, boardwalks, retaining walls
  • Seismic-resistant construction — DIN 436 specifically designed for seismic applications
  • Glulam & engineered timber connections — structural bolting in large-span timber structures
  • Agricultural buildings & barns — heavy timber connections, cost-effective HDG finish
  • Civil engineering & infrastructure — timber bridges, noise barriers, retaining structures
  • Playground & park equipment — outdoor durability with HDG long-term protection

Product Photo Gallery

FULLERKREG DIN 436 Square Washer, Low Carbon Steel, Hot-Dip Galvanized:

[ Photo 1 ] [ Photo 2 ] [ Photo 3 ] [ Photo 4 ]

Why Choose FULLERKREG?

  • 🏭 Direct manufacturer — factory in China, no middlemen
  • 📐 Strict DIN dimensional control — 100% inspection on critical dimensions
  • 🌍 Global export experience — serving distributors in Europe, North America, Southeast Asia
  • 📦 Flexible MOQ — small trial orders and large bulk shipments both welcome
  • 📋 Full documentation — material certs, HDG inspection reports, RoHS declarations available
  • ⚡ Fast lead times — standard sizes in stock, ready to ship

Frequently Asked Questions

Q: What is hot-dip galvanizing (HDG)?
A: Hot-dip galvanizing is a process where steel is immersed in molten zinc at approximately 450°C, forming a metallurgically bonded zinc-iron alloy coating (45–85 μm thick per ISO 1461). The zinc coating provides cathodic protection — zinc sacrificially corrodes to protect the base steel, and the coating is self-healing at cut edges and scratches.

Q: Why choose HDG over stainless steel for timber construction?
A: HDG is the most cost-effective choice for heavy-duty outdoor timber construction where large quantities of M10–M52 washers are required. It provides excellent long-term corrosion protection (25–50+ years) at significantly lower cost than stainless steel. Choose stainless steel (A2 or A4) for food-safe, non-magnetic, or marine applications.

Q: What is DIN 436?
A: DIN 436 specifies square flat washers for wood construction. The large square profile provides a much greater bearing area than standard round washers, preventing bolt head pull-through in timber and distributing load over a wider surface. Specifically designed for timber framing and seismic applications.

Q: Does HDG coating affect dimensions?
A: Yes. HDG adds 45–85 μm per surface. For M10–M52 structural applications this is generally negligible, but should be considered for precision fits. Inner hole diameter is typically reamed after galvanizing for threaded fastener clearance.

Q: Do you provide material test certificates?
A: Yes. Mill certificates, HDG coating thickness inspection reports, and RoHS declarations available upon request.

FULLERKREG Fasteners — Precision DIN Standard Fasteners, Direct from Manufacturer.
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