DIN 436 Square Washer for Wood Construction — Low Carbon Steel, Zinc Plated

FULLERKREG DIN 436 square flat washers are manufactured to DIN 436 standard in low carbon steel with zinc electroplating. 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 applications where pull-through resistance is critical. Zinc electroplating provides a bright, uniform finish with basic corrosion protection suitable for indoor, sheltered, and light outdoor applications. This is the most economical finish option in the DIN 436 range, ideal for general timber construction where aggressive corrosion exposure is not expected.

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Product Highlights

• Standard: DIN 436 (Square Flat Washer for Wood Construction)
• Material: Low Carbon Steel (Q235 / S235 equivalent)
• Surface Treatment: Zinc Electroplating
• Zinc Coating Thickness: 5–12 μm
• Size Range: M10 – M52
• Profile: Square — large bearing area, prevents rotation, distributes load over wide surface
• Most economical finish in the DIN 436 range
• Best for: Indoor, sheltered, and light outdoor timber applications
• RoHS & REACH Compliant

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Dimensional Specifications — DIN 436 Square Washer, Low Carbon Steel Zinc Plated

All dimensions in millimeters (mm). Per DIN 436.

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. Zinc electroplating adds 5–12 μm per surface — negligible dimensional impact.

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Zinc Electroplating vs. HDG vs. Stainless Steel — Surface Treatment Comparison

Property	Zinc Electroplating (This Product)	HDG	A2 Stainless (SUS304)
Coating thickness	5–12 μm	45–85 μm	N/A (passive layer)
Corrosion resistance	Basic — indoor / sheltered outdoor	Excellent — heavy outdoor structural	Good — general outdoor
Cathodic protection	Limited	Yes — full cathodic protection	No
Appearance	Bright silver, uniform	Matte grey, textured	Bright silver, smooth
Cost	Most economical	Medium	Higher
Best for	Indoor, sheltered, light outdoor	Heavy-duty outdoor structural	Corrosion-resistant, food-safe

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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

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Material Properties — Low Carbon Steel, Zinc Plated

Property	Value
Material	Low Carbon Steel (Q235 / S235 equivalent)
C Content	≤0.22%
Surface Treatment	Zinc Electroplating
Coating Thickness	5–12 μm
Appearance	Bright silver, uniform finish
Operating Temperature	-20°C to +120°C
RoHS / REACH	Compliant

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Application Scenarios

• Indoor timber construction — roof structures, floor joists, interior framing
• Sheltered outdoor timber structures — covered walkways, carports, sheltered decking
• Light-duty timber connections — furniture, shelving, light structural applications
• General timber framing — where aggressive corrosion exposure is not expected
• Temporary structures — formwork, scaffolding, temporary timber platforms
• Cost-sensitive projects — most economical DIN 436 option for large-volume requirements

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Product Photo Gallery

FULLERKREG DIN 436 Square Washer, Low Carbon Steel, Zinc Plated:

[ Photo 1 ]

[ Photo 2 ]

[ Photo 3 ]

[ Photo 4 ]

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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, RoHS declarations available
• ⚡ Fast lead times — standard sizes in stock, ready to ship

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Frequently Asked Questions

Q: What is the difference between zinc electroplating and HDG?
A: Zinc electroplating deposits a thin zinc layer (5–12 μm) via electrical current — uniform, bright finish, most economical, suitable for indoor and sheltered applications. HDG (hot-dip galvanizing) immerses steel in molten zinc forming a thick metallurgically bonded coating (45–85 μm) with full cathodic protection — preferred for heavy-duty outdoor structural applications.

Q: Is zinc-plated DIN 436 suitable for outdoor use?
A: Zinc-plated washers are suitable for sheltered outdoor and light outdoor use. For exposed outdoor structural timber applications, HDG is recommended. For marine or coastal environments, A2 or A4 stainless steel is preferred.

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.

Q: Do you provide material test certificates?
A: Yes. Mill certificates and RoHS declarations available upon request.

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