Washer DIN 137A

Description

The DIN 137A washer is a single-curvature wavy spring washer, used to maintain tension in bolted joints and compensate for thermal expansion or settlement. Its elastic design provides light spring pressure, preventing loosening due to vibrations.

Assembly

For the installation of DIN 137A washers, make sure that the contact surface is clean and free of impurities. Place the washer between the screw head and the supporting surface, aligning it correctly. Apply the indicated tightening torque, allowing a slight elastic deformation that maintains tension and prevents loosening due to vibrations.

Materials

DIN 137A washers are made of carbon steel or stainless steel (A2, A4), offering good elasticity and fatigue resistance. They can have finishes such as zinc plating, phosphating or blued, which improve their protection against corrosion and extend their useful life in industrial environments.

Technical data

Para / For	D1	D2	H	S
M2	2.2	4.5	1	0.3
M2.3	2.5	5	1	0.3
M2.5 (#DIN)	2.6	5	1	0.3
M2.6	2.8	5.5	1.1	0.3
M3	3.2	6	1.3	0.4
M3.5	3.7	7	1.4	0.4
M4	4.3	8	1.6	0.5
M5	5.3	10	1.8	0.5
M6	6.4	11	2.2	0.5
M7	7.4	12	2.4	0.5
M8	8.4	15	3.4	0.5
M10	10.5	18	4	0.8

Technical drawing and installation parameters of the DIN 137A curved spring washers

This technical diagram defines the dimensions and geometric variables that are essential for the correct selection and installation of the DIN 137A curved spring washer, with a single curvature. It shows the critical dimensions linked to the specification tables, such as the thread size of the bolt or nut it accompanies, the inside diameter (d1), the outside diameter (d2), the strip thickness (S) and the maximum height of the washer in the free state (H). Complying with these dimensions ensures a smooth and constant spring pressure, which compensates thermal expansion and settling of the assembly and prevents loosening caused by vibration.

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