Washer DIN 137B

Description

The DIN 137B washer is a double curvature wavy elastic washer, designed to maintain tension in bolted joints and compensate for thermal expansion or settlement. Its elastic shape provides constant pressure that prevents loosening due to vibrations and improves the stability of the joint.

Assembly

For the installation of DIN 137B 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 recommended tightening torque to allow for uniform elastic deformation that maintains tension and prevents vibration loosening.

Materials

DIN 137B washers are mainly made of carbon steel or stainless steel (A2, A4), offering good elasticity and fatigue resistance. They can also be produced in plastic materials such as nylon for light applications. Common finishes include galvanizing, phosphating or nickel plating, which enhance its protection against corrosion and wear.

Technical data

Para / For	d1	d2	H	S
M3	3.2	8	1.6	0.5
M3.5	3.7	8	1.8	0.5
M4	4.3	9	2	0.5
M5	5.3	11	2.2	0.5
M6	6.4	12	2.6	0.5
M7	7.4	14	3	0.8
M8	8.4	15	3	0.8
M10	10.5	21	4.2	1
M12	13	24	5	1.2
M14	15	28	6	1.6
M15	16	29	6.2	1.6
M16	17	30	6.4	1.6
M18	19	34	6.6	1.6
M20	21	36	7.4	1.6
M22	23	40	7.6	1.8
M24	25	44	8.2	1.8
M27	28	50	9.4	2
M30	31	56	10	2.2
M33	34	60	10.6	2.5
M36	37	68	11.6	2.5

Technical drawing and installation parameters of the DIN 137B wave spring washers

This technical diagram defines the dimensions and geometric variables that are essential for the correct selection and installation of the DIN 137B wave spring washer, with a double 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 constant spring pressure all around the circumference, which keeps the joint under tension and prevents loosening caused by vibration or by temperature changes.

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