DIN 6798 Serrated Lock Washer

The DIN 6798 serrated lock washer prevents self-loosening of threaded connections through teeth that grip the surface of the mating part. It belongs to the category of lock washers used in mechanical engineering, machine tool building, construction and other industries.

Type A — external teeth. They create a counter-force and ensure grip on the surface of the mating part. Used together with bolts, screws and other metric fasteners. The inner diameter is slightly larger than the thread diameter of the corresponding fastener.

Key characteristics of DIN 6798 washers

• Material: most commonly carbon steel C45, also versions in stainless steel 1.4310, A2, A4 for aggressive environments, and bronze.
• Coating: usually zinc, to protect against corrosion under conditions of high humidity or exposure to chemicals.
• Shape: the teeth are arranged along the outer diameter of the washer and provide engagement with the surfaces of the parts, which prevents the fastening from loosening under vibration.
• Sizes: diameters range from M2 to M30. Inner and outer diameters comply with ISO and GOST standards.

Design variants:

• DIN 6798 A — lock washer with external teeth
• DIN 6798 J — lock washer with internal teeth
• DIN 6798 V — lock washer, V (concave) shape, similar to GOST 10464 requirements

Purpose

The teeth create elastic resistance that holds the connection under vibration or dynamic loads.

• Vibration resistance.
• Easy installation and removal.
• Long service life.
• Choice of material and coating depending on operating conditions.
• Stainless steel and zinc-plated versions are suitable for aggressive environments.

The washers are used in the automotive industry, equipment manufacturing, construction and equipment repair.

DIN 6798 equivalents

Equivalents under GOST 10462-81 and ISO 10670 — serrated washers with a similar purpose, differing in certain design features.

Dimension table for DIN 6798 A serrated lock washer with external teeth, in mm

d*	d₁	d₂	s
M2	2.2	4.5	0.3
M2.3	2.5	5	0.4
M2.5	2.7	5.5	0.4
M3	3.2	6	0.4
M3.5	3.7	7	0.5
M4	4.3	8	0.5
M5	5.3	10	0.6
M6	6.4	11	0.7
M7	7.4	12.5	0.8
M8	8.4	15	0.8
M10	10.5	18	0.9
M12	13	20.5	1
M14	15	24	1
M16	17	26	1.2
M18	19	30	1.4
M20	21	33	1.4
M22	23	36	1.5
M24	25	38	1.5
M27	28	44	1.6
M30	31	48	1.6

* - thread size of the fastener

Dimension table for DIN 6798 V concave serrated lock washer, in mm

d*	d₁	d₂	s
M3	3.2	6	0.2
M3.5	3.7	7	0.25
M4	4.3	8	0.25
M5	5.3	9.8	0.3
M6	6.4	11.8	0.4
M8	8.4	15.3	0.4
M10	10.5	19	0.5
M12	13	23	0.5

* - fastener thread size

Dimension table for DIN 6798 I serrated lock washer with internal teeth, in mm

d*	d₁	d₂	s
M2	2.2	4.5	0.3
M2.3	2.5	5	0.4
M2.5	2.7	5.5	0.4
M3	3.2	6	0.4
M3.5	3.7	7	0.5
M4	4.3	8	0.5
M5	5.3	10	0.6
M6	6.4	11	0.7
M7	7.4	12.5	0.8
M8	8.4	15	0.8
M10	10.5	18	0.9
M12	13	20.5	1
M14	15	24	1
M16	17	26	1.2
M18	19	30	1.4
M20	21	33	1.4
M22	23	36	1.5
M24	25	38	1.5
M27	28	44	1.6
M30	31	48	1.6

Designations:

d* - thread size of bolts, screws, nuts

d₁ - inner diameter of the lock washer

d₂ - outer diameter

s - washer material thickness

h - washer height in the free state