DIN 6798 Type A Lock Washers – Anti – Vibration Serrated Fasteners

Short Description:

Product name: Lock Washers DIN 6798 Type A

Place of Origin:Hebei, China

Brand Name:Duojia

Surface treatment:plain

Finish: Polished

Size: M3-M24

Material:Stainless Steel

Grade:4.8 8.8 10.9 12.9 A2-70 A4-70 A4-80 etc.

Measurement system:Metric

Application:Heavy Industry, General Industry

Certificate:ISO9001 ISO14001 ISO45001 SGS

Package:Small Pack+Carton+Pallet/Bag/Box With Pallet

Sample:Available

Min.Order Quantity:100 Piece/Pieces

Supply Ability:10000 Piece/Pieces per Month

FOB Price:US $0.5 – 9,999 / Piece

delivery:14-30days on qty

payment:t/t/lc

supply ability:500 ton per month

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Product Detail

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introduction to products：

Serrated Lock Washers - Type A, with External Teeth (e.g., DIN 6798 standard): These are circular washers featuring sharp, serrated teeth along the outer edge. Manufactured from carbon steel (often zinc - plated for rust resistance or black oxide for durability) or stainless steel (304/316 for use in corrosive environments), they offer a cost - effective and reliable solution for preventing bolt loosening.

When tightened, the external teeth bite into the surface of the fastened component (such as metal plates or plastic casings), increasing friction to stop bolts from coming loose due to vibration. They are widely used in electronics, household appliances, automotive interiors, and small - scale machinery, and are compatible with bolt sizes ranging from M3 to M16.

Instructions for Use：

Serrated lock washers (Type A) are installed between a bolt/nut and the component being fastened:

Position the teeth: Place the washer with the serrated side facing the surface of the fastened component (whether it's metal, plastic, etc.).
Tighten properly: Use a torque wrench to compress the washer; avoid over - tightening, as this can damage the teeth.
Regular inspection: Check the teeth for wear, especially in environments with high vibration, to ensure the continued anti - loosening performance.

d	min=nominal size	1.7	2.2	2.7	3.2	3.7	4.3	5.3	6.4	7.4	8.4
d	max	1.84	2.34	2.84	3.38	3.88	4.48	5.48	6.62	7.62	8.62
dc	max=nominal size	3.6	4.5	5.5	6	7	8	10	11	12.5	15
dc	min	3.3	4.2	5.2	5.7	6.64	7.64	9.64	10.57	12.07	14.57
t		0.3	0.3	0.4	0.4	0.5	0.5	0.6	0.7	0.8	0.8
Number of Teeth	min	9	9	9	9	10	11	11	12	14	14
per 1000 units≈kg		0.02	0.03	0.045	0.06	0.11	0.14	0.28	0.36	0.5	0.8
For Nominal Thread Diameter		M1.6	M2	M2.5	M3	M3.5	M4	M5	M6	M7	M8
Size		10.5	13	15	17	19	21	23	25	28	31
d	min=nominal size	10.5	13	15	17	19	21	23	25	28	31
d	max	10.77	13.27	15.27	17.27	19.33	21.33	23.33	25.33	28.33	31.39
dc	max=nominal size	18	20.5	24	26	30	33	36	38	44	48
dc	min	17.57	19.98	23.48	25.48	29.48	32.38	35.38	37.38	43.38	47.38
t		0.9	1	1	1.2	1.4	1.4	1.5	1.5	1.6	1.6
Number of Teeth	min	16	16	18	18	18	20	20	20	22	22
per 1000 units≈kg		1.25	1.6	2.3	2.9	5	6	7.5	8	12	14
For Nominal Thread Diameter		M10	M12	M14	M16	M18	M20	M22	M24	M27	M30

Hebei Duojia Metal Products Co., Ltd. was formerly known as Yonghong Expansion Screw Factory. It has over 25 years of professional experience in manufacturing fasteners. The factory is located in the China Standard Room Industrial Base - Yongnan District, Handan City. It conducts online and offline production and manufacturing of fasteners as well as one-stop sales service business.

The factory covers an area of over 5,000 square meters, and the warehouse covers an area of over 2,000 square meters. In 2022, the company carried out industrial upgrading, standardized the production order of the factory, improved the storage capacity, enhanced safety production capacity, and implemented environmental protection measures. The factory has achieved a preliminary green and environmentally friendly production environment.

The company has cold pressing machines, stamping machines, tapping machines, threading machines, forming machines, spring machines, crimping machines, and welding robots. Its main products are a series of expansion screws known as "wall climbers".

It also produces special-shaped hook products such as wood tooth welding sheep eye ring screws and machine tooth sheep eye ring bolts. In addition, the company has expanded new product types from the end of 2024. It focuses on pre-buried products for the construction industry.

The company has a professional sales team and a professional follow-up team to safeguard your products. The company guarantees the quality of the products it offers and can conduct inspections on the grades. If there are any problems, the company can provide professional after-sales service.

Our export countries include Russia, South Korea, Britain, France, Germany, Italy, Canada, Mexico,Brazil, Argentina, Chile, Australia, Indonesia, Thailand, Singapore, Saudi Arabia, Syria, Egypt, Tanzania.Kenya and other countries. Our products will be spread all over the world!

WHY CHOOSE US?

1.As a factory-direct upplier,we eliminate middleman margis to offer you the most competitive pricing for high-quality fasteners.
2.our factory pass the ISO 9001 and AAA certification .we have the hardness testing and the test of zinc coating thickness for galvanized products.
3.with full contrl over production and logistic,we guarantee on-time delivery even for urgnt orders .
4.our engineering team can customize faseners from prototype to mass production , including unique thread designs and anti-corrosion coatings.
5.From carbon steel hex bolts to high-tensile anchor bolts ,we provide a one-stop solution for all your fastener needs.
6.If any defect is found ,we’ll reship replacements within 3weeks of our cost .