Washer DIN 127B

Description

The DIN 127B is a spring-loaded lock washer with square ends, designed to prevent loosening of screws and nuts. Its split shape generates pressure and friction during tightening, keeping the joint firm against vibrations, shocks or load variations.

Assembly

To mount the DIN 127B washer, place it between the nut or screw head and the support surface. The groove should be oriented so that it tends to close during tightening. When the torque is applied, the washer compresses and generates the elastic force necessary to prevent loosening. Do not reuse if it appears crushed or deformed.

Materials

DIN 127B washers are typically made of carbon steel and A2, A4 or 1.4122 stainless steel. They are available with phosphated, oiled, zinc-plated, hot-dip galvanized finishes or with coatings such as yellow passivation or zinc lamellae. These options improve their corrosion resistance and durability in demanding mechanical applications.

Technical data

Para / For	d1	d2	h	s
M2	2.1	4.4	1.2	0.5
M2.3	2.4	4.9	1.2	0.6
M2.5	2.6	5.1	1.4	0.6
M2.6	2.7	5.2	1.4	0.6
M3	3.1	6.2	1.9	0.8
M3.5	3.6	6.7	1.9	0.8
M4	4.1	7.6	2.1	0.9
M5	5.1	9.2	2.8	1.2
M6	6.1	11.8	3.8	1.6
M7	7.1	12.8	3.8	1.6
M8	8.1	14.8	4.7	2
M10	10.2	18.1	5.2	2.2
M11	11.2	18.2	5.2	2.2
M12	12.2	21.1	5.9	2.5
M14	14.2	24.1	7.1	3
M16	16.2	27.4	8.3	3.5
M18	18.2	29.4	8.3	3.5
M20	20.2	33.6	9.4	4
M22	22.5	35.9	9.4	4
M24	24.5	40	11.8	5
M27	27.5	43	11.8	5
M30	30.5	48.2	14.2	6
M33	33.5	55.2	14.2	6
M36	36.5	58.2	14.2	6
M39	39.5	61.2	14.2	6
M42	42.5	68.2	16.5	7
M45	45.5	71.2	16.5	7
M48	49	75	16.5	7
M52	53	83	18.9	8
M56	57	87	18.9	8
M60	61	91	18.9	8
M64	65	95	18.9	8
M68	69	99	18.9	8
M72	73	103	18.9	8
M76	77	107	18.9	8
M80	81	111	18.9	8
M90	91	121	18.9	8
M100	101	131	18.9	8

Technical drawing and installation parameters of the DIN 127B spring lock washers

This technical diagram defines the dimensions and geometric variables that are essential for the correct selection and installation of the DIN 127B spring lock washer, of split form and with square ends. 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 material thickness (s) and the maximum height of the free washer before tightening (h). Complying with these dimensions ensures the spring pressure and the friction required between the surfaces, so that the joint stays tight against vibration, impact and load variations.

Can we help you?

Our team will help you find the best solution and choose the optimal profile and material for your application.