DIN 434 Square Taper Washers for U-Sections

What is a DIN 434 Square Taper Washer?

DIN 434 square tapered washers have an 8° taper. They have two parallel grooves and are used in channel steel (U-section steel). They are available in carbon steel or stainless steel, with surface treatments including black oxide, electrogalvanized, and hot-dip galvanized.

DIN 434 Size Chart

mm		M8	M10	M12	M16	M20	M22	M24	M27
d	min=nominal size	9	11	13.5	17.5	22	24	26	30
	max	9.36	11.43	13.93	17.93	22.52	24.52	26.52	30.52
a	Nominal Size	22	22	26	32	40	44	56	56
	min	20	20	24	29.5	37.5	41.5	53	53
	max	24	24	28	34.5	42.5	46.5	59	59
b	Nominal Size	22	22	30	36	44	50	56	56
	min	21.35	21.35	29.35	35.2	43.2	49.2	55.05	55.05
	max	22.65	22.65	30.65	36.8	44.8	50.8	56.95	56.95
e	Ref.	2.9	2.9	3.7	4.45	5.25	6	6.26	6.26
h	Nominal Size	3.8	3.8	4.9	5.9	7	8	8.5	8.5
	min	3.2	3.2	3.9	4.9	6	7	7.3	7.3
	max	4.4	4.4	5.9	6.9	8	9	9.7	9.7
r	≈	1.6	1.6	2	2.4	2.8	3.2	3.2	3.2
t	≈	0.5	0.5	0.7	0.8	0.9	1	1	1
per 1000 units ≈ kg		9.57	8.85	18.2	31.4	56.9	82.3	128	119

DIN 434 vs DIN 435 Washers

Feature	DIN 434	DIN 435
Shape	Square	Rectangular
Application	U-section	I-beam
Design	Tapered	Tapered
Usage	General structural	Heavy steel

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Applications

DIN 434 taper washers are widely used in structural and heavy-duty fastening systems.

• Steel structures (U-beams / C-channels)
• Construction engineering
• Bridge and infrastructure projects
• Railway systems
• Industrial equipment installation
• Power transmission towers