Home » DIN 137B Spring Washer (Crinkled) – A2 Stainless

DIN 137B Spring Washer (Crinkled) – A2 Stainless

DIN 137B Crinkled Spring Washer — A2 Stainless Steel (SUS304), Whitened & Passivated

FULLERKREG DIN 137B crinkled spring washers are manufactured to DIN 137 Type B standard in A2 stainless steel (SUS304 / 1.4301 / 0Cr18Ni9) with a whitened and passivated surface finish. DIN 137 Type B is a crinkled (wavy) spring washer featuring multiple corrugations around the ring circumference, providing distributed multi-point axial spring force with a larger outer diameter than DIN 128B. The crinkled profile generates spring force without sharp edges, making it ideal for soft materials, coated surfaces, and applications where surface marking must be avoided. A2 stainless steel provides excellent general corrosion resistance, non-magnetic properties, and food-safe compliance.

Product Highlights

  • Standard: DIN 137 Type B (Crinkled / Wavy Spring Washer)
  • Material: A2 Stainless Steel (SUS304 / 1.4301 / 0Cr18Ni9)
  • Surface Treatment: Whitened & Passivated
  • Size Range: M3 – M36
  • Profile: Type B — Crinkled / Wavy (multiple corrugations, larger OD than DIN 128B)
  • Function: Multi-wave axial spring force — anti-loosening, distributed load, no surface marking
  • Non-magnetic, non-sparking
  • RoHS & REACH Compliant

Dimensional Specifications — DIN 137 Type B (Crinkled), A2 Stainless

All dimensions in millimeters (mm). Per DIN 137 Type B.

Nominal Size For Bolt d1 min d2 max h min h max s (thickness)
3 M3 3.2 7.5 0.8 1.2 0.5
4 M4 4.3 9.5 1.0 1.4 0.6
5 M5 5.3 11.5 1.2 1.7 0.8
6 M6 6.4 14.0 1.5 2.1 1.0
8 M8 8.4 18.0 2.0 2.8 1.2
10 M10 10.5 22.0 2.5 3.5 1.5
12 M12 13.0 26.0 3.0 4.2 1.8
14 M14 15.0 30.0 3.5 4.9 2.0
16 M16 17.0 34.0 4.0 5.6 2.5
20 M20 21.0 42.0 5.0 7.0 3.0
24 M24 25.0 50.0 6.0 8.4 3.5
30 M30 31.0 62.0 7.5 10.5 4.0
36 M36 37.0 74.0 9.0 12.6 5.0

All dimensions in mm per DIN 137 Type B. s = material thickness; h = free height (crinkled profile height). Same outer dimensions as DIN 137A — profile differs (wavy vs. curved).

DIN 137B vs. DIN 137A — Key Differences

Feature DIN 137 Type B (Crinkled) DIN 137 Type A (Curved)
Profile Crinkled / wavy (multiple corrugations) Single curved arc (dished)
Contact points Multi-point contact Continuous curved contact
Spring action Distributed multi-wave spring force Axial spring via single curve
Outer dimensions Same as DIN 137A Same as DIN 137B
Typical use General assemblies, multi-point load distribution Higher load, larger bearing area

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

Application Scenarios

  • General bolted assemblies — multi-point load distribution without surface marking
  • Food & beverage processing equipment — A2 stainless, food-safe, easy to clean
  • Medical & pharmaceutical equipment — non-magnetic, corrosion-free
  • Electronics & precision instruments — non-magnetic, no surface damage
  • Outdoor & architectural hardware — excellent atmospheric corrosion resistance
  • Soft material assemblies — aluminum, plastic, coated surfaces where sharp edges must be avoided
  • Thermal cycling applications — multi-wave spring action compensates for expansion/contraction

Product Photo Gallery

FULLERKREG DIN 137B Crinkled Spring Washer, A2 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 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

Frequently Asked Questions

Q: What is DIN 137 Type B?
A: DIN 137 Type B is a crinkled (wavy) spring washer with multiple corrugations around the ring circumference. It generates distributed multi-point axial spring force with a larger outer diameter than DIN 128B. No sharp edges — no surface marking.

Q: What is the difference between DIN 137B and DIN 137A?
A: DIN 137A is curved (single dished arc); DIN 137B is crinkled/wavy (multiple corrugations). Both share the same outer dimensions. Type B provides multi-point contact; Type A provides continuous curved contact.

Q: What is the difference between DIN 137B and DIN 128B?
A: DIN 137B has a larger outer diameter than DIN 128B for the same bolt size, providing greater spring travel and higher load capacity. DIN 128B is designed for cheese head and pan head screws with a smaller OD.

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.

FULLERKREG Fasteners — Precision DIN Standard Fasteners, Direct from Manufacturer.
For wholesale inquiries, technical questions, or custom orders, please contact our sales team.

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