Spring Washer

Spring Washer – Product Details

JMIKS Fasteners supplies spring washers (split lock washers) in SS 304, SS 316 and SS 202 for bolt sizes M8 to M36 and 5/16″ to 1-1/4″ BSW, to DIN and IS standards.

Specifications

Standard : DIN / IS / AISI
Size : Metric- M8 to M36, BSW – 5/16 to 1.1/4″
Grade : SS304 | SS316 | SS202

How a Spring Washer Works

A spring washer is a split ring with its ends bent apart. When the nut is tightened, the washer is flattened and pushes back like a spring, which keeps tension in the joint and helps to stop the nut from loosening. The common standards are DIN 127 and IS 3063.

Applications

Motors, pumps and fans
Electrical panels and transformers
Automobile and machine assemblies
Railway and structural fittings

Spring Washer Size Chart (DIN 127 B)

Bolt size	Inner diameter	Outer diameter	Thickness
M8	8.1	14.8	2.0
M10	10.2	18.1	2.2
M12	12.2	21.1	2.5
M14	14.2	24.1	3.0
M16	16.2	27.4	3.5
M20	20.2	33.6	4.0
M24	24.5	40.0	5.0
M30	30.5	48.2	6.0
M36	36.5	58.2	6.0

All dimensions in mm, for reference.

Spring Washer FAQs

Where does the spring washer go?

Under the nut or bolt head that is turned, on top of a plain washer if one is used.

Spring washer or nylock nut?

Both resist loosening. A spring washer works with any nut and at high temperature. A nylock nut needs no extra part but suits temperatures up to about 120 °C.

Do spring washers work on high tensile bolts?

Spring washers suit mild steel and general joints. On high tensile 8.8 to 12.9 bolts, which are tightened to a high load, they add little locking, so a nylock nut or correct tightening is preferred.