DIN137A Curved Spring Washer

The DIN137A Curved Spring Washer produced by Xiaoguo® Factory have a unique design. This design can provide stable axial preload force between components such as bearings, eliminate axial clearance, prevent the washers from shaking, and thus avoid affecting the overall usage.

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Product Description

The DIN137A Curved Spring Washer is an elastic metal gasket with a single or multiple arc-shaped bending structure. It generates elastic preload force through its own arc deformation and is assembled below the bolts and nuts. It is used to eliminate the gap in the connection of fasteners, maintain preload force, compensate for thermal expansion or wear, and resist moderate vibration.

Name	DIN137A Curved Spring Washer
Material	Stainless steel/alloy steel/carbon steel/brass/spring steel
Standards	DIN137A
Thread	Metric/Metric
Sizes	M2-M12
Finish	Zinc/Black/Natural/others
Customizable	YES
Sample	YES

Structure Introduction

What does the structure of a DIN137A Curved Spring Washer look like? In simple terms, it is a small metal ring with an arc shape.

【Overall shape】

The DIN137A Curved Spring Washer is not a regular flat washer. If you hold it in your hand, you will see that it bulges out on its own, not remaining flat. Depending on the way it bulges, there are mainly two structures:

（1）Single-wave arc shape (like a small arch bridge)

The entire washer has a single arc shape, with the middle being higher and the sides being lower, resembling a mini arch bridge. In its free state, its natural height is much greater than its thickness. When it is flattened, it will generate a reverse thrust.

（2）Multi-wave (like wavy potato chips)

The washer has two or even more waves, with the peaks and valleys alternating and looping around the circumference. When this structure is compressed, the deformation is not as significant as that of a single wave, but the elasticity is more uniform.

These two types of washers are both complete circular rings, with a hole in the middle and no cuts around the edges. The thickness of the material is the same throughout.

DIN137A Curved Spring Washer

Mon	ɸ2	ɸ2.5	ɸ3	ɸ4	ɸ5	ɸ6	ɸ8	ɸ10
d min	2.2	2.7	3.2	4.3	5.3	6.4	8.4	10.5
d max	2.45	2.95	3.5	4.6	5.6	6.76	8.76	10.93
dc min	4.2	5.2	5.7	7.64	9.64	10.57	14.57	17.57
dc max	4.5	5.5	6	8	10	11	15	18
H min	0.5	0.55	0.65	0.8	0.9	1.1	1.7	2
H max	1	1.1	1.3	1.6	1.8	2.2	3.4	4
h	0.3	0.3	0.4	0.5	0.5	0.5	0.5	0.8

【Key structural parts】

（1）Arc-shaped contour (core)

The gasket is not flat in its free state; instead, it presents a single arc surface (like an arch bridge) or multiple ripples (like waves) along the circular direction.

This curved/wave shape is the source of elasticity.

（2）Closed-loop non-cutting

The DIN137A Curved Spring Washer is a complete ring without any spiral cuts.

（3）Uniform thickness section

The thickness of the gasket is uniform throughout the entire circumference, without any gradual change or local thinning.

（4）Ratio of outer diameter to inner diameter

The ratio of the outer diameter to the inner diameter affects the stiffness and supporting area of the washer.