DIN 137, Spring Lock Washer

Spring lock washers under the DIN 137 standard are made as a closed ring, but with different configurations. Form A has a curve in one direction, form B is wave-shaped, curved in different directions. Thanks to the curvature and spring properties of the raw material, the washer can increase the strength of bolted fasteners and protect them from spontaneous loosening even under very strong dynamic loads.

This hardware item is used in most industrial and manufacturing sectors for precise fastening of threaded joints.

Installation features and advantages of the DIN 137 spring lock washer

The main feature of the spring lock washer is related to its configuration, since the wavy or convex shape of the ring promotes tighter contact between the head of the threaded fastener and the surface of the joined part. At the same time, the presence of the backing reduces the pressure of the fastener on the base, and also prevents the joint from spontaneously loosening during operation, including under vibration and other impulse loads.

The installation location of the DIN 137 spring lock washer is under the head of the bolt, screw or stud, or between the nut and the surface of the joined part. When selecting the hardware, it is important to correctly navigate the size range. The FLOK catalogue presents the full product range of this hardware. Washers are conveniently selected by nominal diameter from M3 to M33.

Spring lock washers are made of carbon steel with a zinc or chromium coating applied in galvanic chambers. If operating conditions involve contact of the fastener with aggressive media containing acids, salts, or alkalis, products made of stainless steel grade A2, or even better A4, which contains molybdenum, should be selected.

DIN 137 spring lock washers from the FLOK catalogue are used in the machine-building and machine-tool industries. They are used by builders and manufacturers of automotive equipment, as well as specialists in the agricultural sector.

FLOK supplies products to enterprises of various forms of ownership, individual entrepreneurs and private individuals, in wholesale batches and retail. FLOK accepts advance orders for the manufacture of washers to the customer’s sizes.

Dimensions of the DIN 137 A spring lock washer in mm:

d		Washer size	d₁	d₂	s	h min
Spring Lock Washer DIN 137 A	M1.2	A1.2	1.3	3	0.2	0.35
Spring Lock Washer DIN 137 A	M1.4	A1.4	1.5	3	0.25	0.4
Spring Lock Washer DIN 137 A	M1.7	A1.7	1.8	4	0.25	0.45
Spring Lock Washer DIN 137 A	M2	A2	2.2	4.5	0.3	0.5
Spring Lock Washer DIN 137 A	M2.3	A2.3	2.5	5	0.3	0.5
Spring Lock Washer DIN 137 A	M2.6	A2.6	2.8	5.5	0.3	0.55
Spring Lock Washer DIN 137 A	M3	A3	3.2	6	0.4	0.65
Spring Lock Washer DIN 137 A	M3.5	A3.5	3.7	7	0.4	0.7
Spring Lock Washer DIN 137 A	M4	A4	4.3	8	0.5	0.8
Spring Lock Washer DIN 137 A	M5	A5	5.3	10	0.5	0.9
Spring Lock Washer DIN 137 A	M6	A6	6.4	11	0.5	1.1
Spring Lock Washer DIN 137 A	M7	A7	7.4	12	0.5	1.2
Spring Lock Washer DIN 137 A	M8	A8	8.4	15	0.5	1.7
Spring Lock Washer DIN 137 A	M10	A10	10.5	18	0.8	2