Home » DIN 6796 Conical Spring Washers – A4 Stainless

DIN 6796 Conical Spring Washers – A4 Stainless

DIN 6796 Conical Spring Washers — A4 Marine Stainless Steel (SUS316), Whitened & Passivated

FULLERKREG DIN 6796 conical spring washers are manufactured to DIN 6796 standard in A4 marine stainless steel (SUS316 / 1.4401 / 06Cr17Ni12Mo2), whitened and passivated. DIN 6796 conical spring washers (also known as Belleville washers or disc spring lock washers) are specifically designed for use in bolted assemblies to prevent loosening under vibration and dynamic loads. The conical shape flattens under bolt preload, storing elastic energy that compensates for relaxation, creep, and thermal cycling in the joint. A4 stainless steel contains 2–3% molybdenum, providing superior resistance to chloride corrosion and seawater — the correct choice for marine, offshore, coastal, and chemical processing applications where A2 (SUS304) may suffer pitting corrosion. Designed for use with bolts of property class 8.8 to 10.9.

Product Highlights

  • Standard: DIN 6796 (Conical Spring Washer for Bolt Assemblies)
  • Material: A4 Marine Stainless Steel (SUS316 / 1.4401 / 06Cr17Ni12Mo2)
  • Surface Treatment: Whitened & Passivated
  • Size Range: M2 – M30
  • Molybdenum content: 2–3% — superior chloride & seawater resistance vs. A2
  • Property class compatibility: 8.8 – 10.9
  • Working principle: Conical spring force — maintains bolt preload under vibration, relaxation, and thermal cycling
  • Also known as: Belleville washer, disc spring lock washer, conical washer
  • Stacking: Same direction = multiply load capacity; opposite direction = greater deflection & shock absorption
  • Reusable — as long as not deformed or damaged
  • Non-magnetic, corrosion-resistant
  • RoHS & REACH Compliant

Dimensional Specifications — DIN 6796, A4 Stainless Steel

All dimensions in millimeters (mm). Per DIN 6796. Same dimensions as A2 grade — material and corrosion resistance differ.

Thread D D1 min D1 max D2 H min H max S (ref)
M2 2.20 2.40 5 0.50 0.60 0.40
M2.5 2.70 2.90 6 0.61 0.72 0.50
M3 3.20 3.40 7 0.72 0.85 0.60
M3.5 3.70 3.90 8 0.94 1.06 0.80
M4 4.30 4.50 9 1.11 1.30 1.00
M5 5.30 5.50 11 1.30 1.50 1.20
M6 6.40 6.60 14 1.70 2.00 1.50
M7 7.40 7.60 17 2.00 2.00 1.75
M8 8.40 8.60 18 1.40 2.80 2.00
M10 10.50 10.80 23 2.20 3.29 2.50
M12 13.00 13.50 28 2.50 3.50 3.00
M14 15.00 15.50 33 3.04 4.05 3.50
M16 17.00 17.50 38 3.51 4.51 4.00
M18 19.00 19.50 42 3.09 5.60 4.50
M20 21.00 21.50 45 5.00 6.40 5.00
M22 23.00 23.50 50 5.55 6.55 5.50
M24 25.00 25.50 56 6.15 7.75 6.00
M27 28.00 28.50 60 6.77 7.75 6.50
M30 31.00 31.50 70 8.00 9.30 7.00

All dimensions in mm per DIN 6796. D1 = inner diameter; D2 = outer diameter; H = free height (conical); S = material thickness.

A4 vs. A2 Stainless Steel — Key Differences

Property A4 (SUS316) — This Product A2 (SUS304)
Molybdenum (Mo) 2.0 – 3.0% None
Chloride resistance Superior — marine grade Good — general use
Seawater resistance Excellent Limited
Acid resistance Better (Mo addition) Standard
Typical use Marine, offshore, coastal, chemical General outdoor, food, fresh water

DIN 6796 vs. DIN 127 Split Ring Lock Washer — Key Differences

Feature DIN 6796 (Conical Spring) DIN 127 (Split Ring)
Working principle Continuous spring force — maintains preload Sharp edges bite into surfaces
Vibration resistance Superior — spring force maintained under vibration Limited — edges can embed and lose effect
Load capacity High — stackable for increased load Standard
Reusability Yes — if not deformed Limited
Surface damage Minimal — no sharp edges Marks mating surfaces
Best for Heavy vibration, engines, turbines, marine General light-duty anti-loosening

Material Properties — A4 Marine Stainless Steel (SUS316)

Property Value
Material Grade A4 / SUS316 / 1.4401 / 06Cr17Ni12Mo2
Cr Content 16.0 – 18.0%
Ni Content 10.0 – 14.0%
Mo Content 2.0 – 3.0%
Surface Treatment Whitened & Passivated
Magnetic Non-magnetic (austenitic)
Operating Temperature -196°C to +300°C
Corrosion Resistance Excellent — seawater, chlorides, acids, marine environments
Property class compatibility 8.8 – 10.9
RoHS / REACH Compliant

Application Scenarios

  • Marine & offshore equipment — bolted connections in seawater splash zones, offshore platforms
  • Coastal structures — salt air environments where A2 may suffer chloride pitting
  • Chemical processing plants — chloride or acid-containing environments
  • Swimming pool & water treatment — chlorinated water resistance
  • Engines & turbines in marine applications — high-vibration connections with superior corrosion resistance
  • Food & pharmaceutical processing — non-magnetic, hygienic, corrosion-resistant
  • General heavy-duty bolted assemblies — wherever marine-grade anti-loosening performance is required

Product Photo Gallery

FULLERKREG DIN 6796 Conical Spring Washers, A4 Marine Stainless Steel:

[ Photo 1 ] [ Photo 2 ] [ Photo 3 ] [ Photo 4 ]

Why Choose FULLERKREG?

  • 🏭 Direct manufacturer — factory in China, no middlemen
  • 📐 Strict DIN dimensional control — 100% inspection on D1, D2, H, S and spring characteristics
  • 🌍 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 available
  • ⚡ Fast lead times — standard sizes in stock, ready to ship

Frequently Asked Questions

Q: Why choose A4 over A2 for conical spring washers?
A: A4 (SUS316) contains 2–3% molybdenum which significantly improves resistance to chloride pitting and crevice corrosion. In seawater, coastal, or chloride-rich environments, A4 is the correct choice where A2 (SUS304) may suffer pitting over time.

Q: What is a DIN 6796 conical spring washer?
A: DIN 6796 specifies conical spring washers (Belleville washers) for bolt assemblies. The conical shape flattens under bolt preload, storing spring energy that maintains clamping force under vibration, relaxation, and thermal cycling. Designed for use with property class 8.8–10.9 bolts.

Q: Can DIN 6796 washers be stacked?
A: Yes. Stack in the same direction to multiply load capacity. Stack in opposite directions to increase deflection range and shock/vibration absorption.

Q: Are DIN 6796 washers reusable?
A: Yes, as long as the washer has not been deformed beyond its elastic limit or otherwise damaged.

Q: Do you provide material test certificates?
A: Yes. Mill certificates and RoHS declarations available upon request.

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