DIN 6797A External Tooth Lock Washer (Shakeproof) — A2 Stainless Steel (SUS304), Whitened & Passivated

FULLERKREG DIN 6797A external tooth lock washers are manufactured to DIN 6797 Form A standard in A2 stainless steel (SUS304 / 1.4301 / 0Cr18Ni9) with a whitened and passivated surface finish. DIN 6797 Form A features external teeth (on the outer diameter) with a deeper, more aggressive tooth profile than DIN 6798A, providing maximum anti-loosening performance through mechanical engagement at the largest possible tooth radius. Also known as shakeproof washers, DIN 6797 washers are widely specified in electrical, automotive, and high-vibration applications. A2 stainless steel provides excellent general corrosion resistance, non-magnetic properties, and food-safe compliance.

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Product Highlights

• Standard: DIN 6797 Form A (External Tooth Lock Washer / Shakeproof)
• Material: A2 Stainless Steel (SUS304 / 1.4301 / 0Cr18Ni9)
• Surface Treatment: Whitened & Passivated
• Size Range: M3 – M30
• Tooth type: External (teeth on outer diameter — deeper profile than DIN 6798A)
• Anti-loosening mechanism: Deep tooth engagement at largest radius — maximum anti-loosening torque
• Non-magnetic, non-sparking
• RoHS & REACH Compliant

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Dimensional Specifications — DIN 6797 Form A (External Tooth), A2 Stainless

All dimensions in millimeters (mm). Per DIN 6797 Form A.

For Thread	d1 min	d1 max	d2 max	No. of Teeth	s min	s max	kg/1000pcs
M3	3.2	3.5	7.0	12	0.4	0.6	0.07
M3.5	3.7	4.0	8.0	12	0.4	0.6	0.1
M4	4.3	4.6	9.0	16	0.5	0.7	0.15
M5	5.3	5.6	10.0	16	0.5	0.7	0.18
M6	6.4	6.8	12.0	20	0.6	0.8	0.28
M7	7.4	7.8	14.0	20	0.6	0.8	0.42
M8	8.4	8.8	16.0	20	0.8	1.0	0.7
M10	10.5	11.0	20.0	24	0.8	1.0	1.1
M12	13.0	13.5	24.0	24	1.0	1.3	2.0
M14	15.0	15.5	27.0	24	1.0	1.3	2.6
M16	17.0	17.5	30.0	24	1.2	1.5	3.8
M18	19.0	19.5	34.0	28	1.2	1.5	5.1
M20	21.0	21.5	37.0	28	1.2	1.5	6.1
M22	23.0	23.5	39.0	28	1.5	1.8	7.5
M24	25.0	25.5	44.0	28	1.5	1.8	10.0
M27	28.0	28.5	50.0	32	1.5	1.8	14.0
M30	31.0	31.5	56.0	32	1.5	1.8	19.0

All dimensions in mm per DIN 6797 Form A. d1 = inner diameter; d2 = outer diameter; s = thickness.

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DIN 6797 vs. DIN 6798 — Key Differences

Feature	DIN 6797 (Shakeproof)	DIN 6798 (Serrated)
Tooth profile	Deeper, more aggressive	Shallower, standard serration
Anti-loosening strength	Stronger — higher bite-in force	Standard
Surface marking	More pronounced	Standard
Typical use	Electrical, automotive, high-vibration	General industrial assemblies
Common name	Shakeproof washer	Serrated lock washer

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DIN 6797 Form A vs. Form J — Key Differences

Feature	Form A (External) — This Product	Form J (Internal)
Tooth location	Outer diameter	Inner diameter
Bites into	Substrate surface (under bolt head / nut)	Fastener shank / bolt head
Outer surface	Marked by teeth	Preserved — no marking
Anti-loosening torque	Maximum — largest tooth radius	Standard
Best for	Maximum anti-loosening performance	Visible / finished surfaces

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Material & Mechanical Properties — A2 Stainless Steel (SUS304)

Property	Value
Material Grade	A2 / SUS304 / 1.4301 / 0Cr18Ni9
Cr Content	17.5 – 19.5%
Ni Content	8.0 – 10.5%
Surface Treatment	Whitened & Passivated
Magnetic	Non-magnetic (austenitic)
Operating Temperature	-196°C to +300°C
Corrosion Resistance	Excellent — atmospheric, fresh water, mild chemicals
RoHS / REACH	Compliant

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Application Scenarios

• Electrical & electronics assemblies — shakeproof design widely specified in electrical equipment standards
• Automotive manufacturing — body, chassis, and electrical system assemblies
• High-vibration industrial equipment — deeper tooth profile for maximum anti-loosening
• Food & beverage processing equipment — A2 stainless, food-safe, easy to clean
• Medical & pharmaceutical equipment — non-magnetic, corrosion-free
• Outdoor & architectural hardware — excellent atmospheric corrosion resistance
• General industrial bolted assemblies — where maximum anti-loosening is required

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Product Photo Gallery

FULLERKREG DIN 6797A External Tooth Lock Washer, A2 Stainless Steel:

[ Photo 1 ]

[ Photo 2 ]

[ Photo 3 ]

[ Photo 4 ]

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Why Choose FULLERKREG?

• 🏭 Direct manufacturer — factory in China, no middlemen
• 📐 Strict DIN dimensional control — 100% inspection on critical dimensions
• 🌍 Global export experience — serving distributors in Europe, North America, Southeast Asia
• 📦 Flexible MOQ — small trial orders and large bulk shipments both welcome
• 📋 Full documentation — material certs, RoHS declarations, test reports available
• ⚡ Fast lead times — standard sizes in stock, ready to ship

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Frequently Asked Questions

Q: What is DIN 6797 Form A?
A: DIN 6797 Form A is an external tooth lock washer (shakeproof washer). The teeth are on the outer diameter with a deeper, more aggressive profile than DIN 6798A. They bite into the substrate surface under the bolt head or nut, providing maximum mechanical anti-loosening at the largest possible tooth radius.

Q: What is the difference between DIN 6797 and DIN 6798?
A: DIN 6797 (shakeproof) has a deeper, more aggressive tooth profile providing stronger anti-loosening engagement. DIN 6798 (serrated) has a shallower standard serration for general industrial use. DIN 6797 is preferred for electrical, automotive, and high-vibration applications.

Q: Form A vs. Form J — which to choose?
A: Form A (external) maximizes anti-loosening torque by acting at the largest radius — best for maximum performance. Form J (internal) preserves the outer substrate surface — best when outer appearance must be maintained.

Q: Is A2 stainless steel food-safe?
A: Yes. A2 (SUS304) is widely used in food processing and pharmaceutical equipment. Non-toxic, easy to clean, resistant to most food-contact environments.

Q: Do you provide material test certificates?
A: Yes. Mill certificates, chemical composition reports, and dimensional inspection reports are available upon request.

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