External-tooth bite + axial spring force | Ideal for flat surfaces & thin sheet | OEM/ODM
DIN 6797A external tooth lock washers feature twisted teeth around the outer circumference that engage with the fastener and mating surface during tightening. Available in AISI 304, AISI 316 and 65Mn, they are suited to electrical equipment, sheet-metal assemblies, machinery and general fastening applications. Custom dimensions and finishes are available from drawings or samples.
Stamping parts manufacturer
Owned factory
Stamping capacity · 120 presses up to 450 T
Quotation response
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Non-standard sizes can be produced from customer drawings or samples; confirm details at inquiry.
DIN 6797 forms are differentiated primarily by where the teeth are positioned
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For Form A, the external teeth are the defining feature. If the assembly has limited space outside the washer, the J form may be worth considering. If both internal and external engagement are required, the JA configuration should be evaluated.
The actual dimensions should always be checked against the applicable drawing or purchasing specification.
Material selection depends mainly on the required mechanical properties and service environment.
A general-purpose stainless-steel option for machinery, electrical equipment, appliances and outdoor assemblies where moderate corrosion resistance is required.
Provides higher corrosion resistance than AISI 304 in chloride-containing and wet environments. It is commonly considered for marine equipment, chemical environments and applications involving frequent cleaning or washdown.
A spring-steel material with higher hardness and good elastic properties. It is suitable when mechanical performance and resistance to repeated loading are more important than stainless-steel corrosion resistance.
For outdoor or corrosive applications, the washer material should be considered together with the bolt, nut and mating material.
The available finish depends on the selected material and application.
Ningbo Yinzhou Zhenhua Stamping Parts Co., Ltd. manufactures toothed lock washers using precision stamping processes with in-house tooling development and production control.
inner diameter, outside diameter and thickness
tooth form and quantity according to the required specification
AISI 304, AISI 316, 65Mn or other agreed material
according to the required corrosion and appearance requirements
bulk, standard packing or customer-specific packaging
Customer drawings and physical samples can be used for non-standard production. Sample approval can be completed before series production when the application requires dimensional verification.
For this type of washer, several dimensions should be checked before placing an order.
The fastener must provide adequate bearing coverage over the washer.
The external teeth extend beyond the washer body, so surrounding components should not interfere with the washer.
The tooth tips need a suitable surface for engagement. Highly delicate, decorative or easily damaged surfaces may require a different locking method.
Choose stainless steel when corrosion resistance is important; choose 65Mn when mechanical and spring properties are the primary consideration.
The washer should be treated as one part of the complete bolted joint. Bolt grade, tightening torque, joint material and service vibration all affect the final fastening performance.
DIN 6797A is a toothed lock washer with teeth around the outside circumference. The external teeth engage with the fastener and mating surface during tightening to increase resistance to rotational movement.
Both have external teeth, but they are different washer series. DIN 6797A is classified as an external tooth lock washer, while DIN 6798A is an external serrated lock washer. Their tooth geometry and dimensional specifications are different, so one should not be substituted for the other simply because both have external teeth.
Choose Form A when external tooth engagement is appropriate and there is sufficient space around the washer. Form J places the teeth toward the inner bore and can be considered where the outer diameter needs to remain more compact.
DIN 6797A is generally suited to fasteners with sufficient bearing area to cover the washer. Pan-head and other fastener heads with an appropriate bearing diameter are common applications. Always compare the actual head or nut dimensions with the washer outside diameter before ordering.
Yes, it can be used in sheet-metal assemblies, provided the tooth engagement, fastener head coverage and surface condition are suitable for the application. The actual material thickness and tightening condition should be evaluated when the sheet is thin or easily deformed.
Yes. Zhenhua can supply DIN 6797A in AISI 304 (A2) and AISI 316 (A4), as well as 65Mn for applications where spring-steel mechanical properties are required.
Yes. Zhenhua can review customer drawings or samples for non-standard dimensions, materials, tooth configuration and surface treatment before production.
For critical or vibration-sensitive joints, replacement is recommended after disassembly. The teeth can deform or remain embedded in the mating surfaces during the first installation, so a new washer provides a more predictable joint condition.
DIN 6797 has been withdrawn without replacement. However, DIN 6797A continues to appear in purchasing specifications and commercial product catalogs. When a customer specifies DIN 6797A, the dimensional and material requirements should therefore be confirmed against the customer's drawing or specification rather than assuming an interchangeable current standard.
Ningbo Yinzhou Zhenhua Stamping Parts Co., Ltd. supplies DIN 6797A External Tooth Lock Washers for industrial fastening applications in AISI 304, AISI 316 and 65Mn.
For quotation, provide the fastener size, washer dimensions, material, surface finish and required quantity. For non-standard requirements, a drawing or sample can be reviewed by the engineering team before production.
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