DIN 6797 A Spring Toothed Lock Washer

The DIN 6797 A spring toothed lock washer is made from various steel alloys, predominantly from metal with spring properties. It has the shape of a closed ring with a series of teeth arranged around the outer perimeter of the part. This feature is decisive when choosing the washer for use as a locking element in a threaded fastener assembly.

The DIN 6797 A toothed washer with spring teeth is installed under the head of a bolt, screw, or stud. It increases the bearing area of the main fastener, fully covering the working hole in the base material, and protects the joined surfaces from damage. At the same time, thanks to the teeth, the washer prevents the fastener from self-loosening under external dynamic loads: vibration, fluctuations, impacts.

Materials for manufacturing DIN 6797 A spring toothed lock washers

When selecting a washer, it is important not only to choose the correct dimensions, but also to take into account the quality of the source material and its properties. All elements of the fastener assembly must be made of the same type of metal, taking into account the operating conditions.

Toothed washers made of spring or carbon steel without additional treatment are used for fastener assemblies operating in dry environments or intended for painting.

Fasteners made of alloy steel with anti-corrosion coating in the form of electrogalvanizing are not affected by moisture and do not rust. Washers made of chrome-nickel stainless steel grade A2, which requires no protection, have the same properties. For operation in more severe, aggressive conditions (contact with acids, alkalis, salts), fasteners made of austenitic steel class A4 are used.

DIN 6797 A spring toothed lock washers in the FLOK range

FLOK supplies the full range of this type of fastener and its variants. The DIN 6797 standard covers three types of washers: shape A, shape I — a washer with internally located teeth, and shape V, whose teeth have a concave configuration.

Materials:

• Spring steel
• Coated steel: electrogalvanized
• Stainless steel: stainless steel A2 type 12Kh18N9T, acid-resistant austenitic steel A4 type 10Kh17N13M2T.
• Non-ferrous metals, alloys, plastic: bronze.

Dimensions of the DIN 6797 A spring toothed lock washer, mm:

d	d₁	d₂	s
M2	2.2	4.5	0.3
M2.5	3.2	5.5	0.4
M3	3.7	6.0	0.4
M3.5	4.3	7.0	0.5
M4	5.3	8.0	0.5
M5	5.5	10.0	0.6
M6	6.4	11.0	0.7
M7	7.4	12.5	0.8
M8	8.4	15.0	0.8
M10	10.5	18.0	0.9
M12	13.0	20.5	1.0
M14	15.0	24.0	1.0
M16	17.0	26.0	1.2
M18	19.0	30.0	1.4
M20	21.0	33.0	1.4
M22	23.0	36.0	1.5
M24	25.0	38.0	1.5
M27	28.0	44.0	1.6
M30	31.0	48.0	1.6

d	d₁	d₂	s
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