DIN137A M8 Curved Metric Spring Washer

The DIN137A M8 Curved Metric Spring Washer from fastener supplier Xiaoguo® have a compact structure and occupy a small space, which is conducive to storage and suitable for scenarios with limited installation space. They do not increase the overall volume.

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Product Description

The selection of the material for the DIN137A M8 Curved Metric Spring Washer mainly involves comparing and choosing among factors such as elasticity, rust prevention, conductivity, and temperature resistance.

（1）Spring steel 65Mn

The most commonly used material with the highest cost-performance ratio.

It has good elasticity, high hardness and strong fatigue resistance. It is unlikely to deform or break even when repeatedly subjected to pressure; it is suitable for general machinery, household appliances, and common fasteners.

The surface can be treated with galvanizing, blackening, phosphating, or Dacromet coating.

（2）Stainless steel 304 / 316

It has strong anti-corrosion and anti-rust properties, suitable for humid, outdoor, acidic, alkaline and highly corrosive environments.

It has good toughness and does not rust, but its elasticity is slightly weaker than that of spring steel. Stainless steel DIN137A M8 Curved Metric Spring Washer are mainly used in kitchens and bathrooms, outdoor equipment, and chemical instruments.

DIN137A M8 Curved Metric Spring Washer

（3）Phosphor bronze

It has good electrical conductivity, is wear-resistant, corrosion-resistant and self-lubricating.

It is mainly used for electrical grounding, electrical connection and in the working conditions of precision instruments.

（4）Brass

Less commonly used, with good electrical and thermal conductivity, and average rust prevention ability.

The appearance is golden and decorative.

The brass material DIN137A M8 Curved Metric Spring Washer is suitable for low-pressure electrical applications, pipe installation and decorative assembly.

（5）Other special materials

Material	Characteristics	Application
17-7 Stainless Steel	Precipitation hardening, high strength, excellent corrosion resistance	Aerospace and high-stress precision components
Beryllium bronze	Good elasticity, no sparks, conductive	Explosion-proof, precision springs (high cost)
Titanium alloy	Lightweight, high specific strength, excellent corrosion resistance	Aerospace, high-end medical field, racing cars

FAQ

（1）What is the purpose of the DIN137A M8 Curved Metric Spring Washer?

It is mainly used for anti-loosening, vibration reduction and gap compensation. It can maintain a stable elastic pressure between the bolt and the surface, preventing the fastener from loosening under normal vibration.

（2）Will it cause damage to the installation surface?

No. The gasket adopts a smooth closed-loop design, without sharp teeth or cutting edges, so it will not scratch aluminum, plastic, painted parts or precision workpieces.

（3）Can I stack multiple curved washers together?

It is not recommended to do so. Each bolt only requires one washer. Stacking them will result in uneven force distribution, easy deformation and shortened service life.

DIN137A M8 Curved Metric 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