Home » DIN 128B Lock Washer Spring – 70# Steel Zinc

DIN 128B Lock Washer Spring – 70# Steel Zinc

DIN 128B Wavy Spring Lock Washer — 70# Spring Steel, Zinc Plated

FULLERKREG DIN 128B wavy spring lock washers are manufactured to DIN 128 Type B standard in 70# high-carbon spring steel (Grade 70, per GB/T 699) with mechanical zinc plating. DIN 128 Type B features a wavy (corrugated) profile with multiple waves around the ring circumference, generating distributed axial spring force with multi-point contact. The 70# spring steel achieves 40–50 HRC hardness after quench and temper, delivering superior spring force and fatigue resistance. Mechanical zinc plating provides enhanced corrosion protection without hydrogen embrittlement risk — the correct zinc process for high-hardness spring steel.

Note on zinc treatment: At 40–50 HRC, conventional electroplating introduces hydrogen embrittlement risk. FULLERKREG applies mechanical zinc plating (per GB/T 17460) — cold mechanical impact with no acid pickling, no electrical current, no hydrogen introduction.

Product Highlights

  • Standard: DIN 128 Type B (Wavy Spring Lock Washer)
  • Material: 70# Spring Steel (Grade 70, GB/T 699)
  • Surface Treatment: Mechanical Zinc Plating (GB/T 17460) — no hydrogen embrittlement
  • Hardness: 40–50 HRC (392–513 HV) after quench & temper
  • Size Range: M2 – M36
  • Profile: Type B — Wavy / corrugated (multiple waves)
  • Corrosion Resistance: Enhanced — suitable for light outdoor and humid environments
  • RoHS & REACH Compliant

Dimensional Specifications — DIN 128 Type B (Wavy), 70# Steel Zinc

All dimensions in millimeters (mm). Per DIN 128 Type B.

Nominal Size For Bolt d1 min d2 max h min h max s (thickness) b (width)
2 M2 2.1 4.4 0.70 1.10 0.6 0.9
2.3 M2.3 2.4 4.9 0.90 1.10 0.6 0.9
2.5 M2.5 2.6 5.1 0.90 1.10 0.6 1.0
2.6 M2.6 2.7 5.2 0.90 1.10 0.6 1.0
3 M3 3.1 6.2 1.10 1.30 0.7 1.3
3.5 M3.5 3.6 6.7 1.20 1.30 0.7 1.3
4 M4 4.1 7.6 1.20 1.40 0.8 1.5
5 M5 5.1 9.2 1.50 1.70 1.0 1.8
6 M6 6.1 11.8 2.00 2.20 1.3 2.5
8 M8 8.1 14.8 2.45 2.75 1.6 3.0
10 M10 10.2 18.1 2.85 3.35 1.8 3.5
12 M12 12.2 21.1 3.35 3.65 2.1 4.0
14 M14 14.2 24.1 3.90 4.30 2.4 4.5
16 M16 16.2 27.4 4.50 5.10 2.8 5.0
18 M18 18.2 26.4 4.50 5.10 2.8 5.0
20 M20 20.2 33.6 5.10 5.90 3.2 6.0
22 M22 22.5 35.9 5.10 5.90 3.2 6.0
24 M24 24.5 40.0 6.50 7.50 4.0 7.0
27 M27 27.5 43.0 6.50 7.50 4.0 7.0
30 M30 30.5 48.2 9.50 10.50 5.0 8.0
36 M36 36.5 58.2 10.30 11.30 6.0 10.0

All dimensions in mm per DIN 128 Type B. s = material thickness; b = ring width; h = free height (wavy profile height).

Material Properties — 70# Spring Steel (GB/T 699)

Property Value
Material Grade 70# Spring Steel (Grade 70)
GB Standard GB/T 699, GB/T 4354
C Content 0.67 – 0.75%
Mn Content 0.50 – 0.80%
Heat Treatment Quench & Temper
Hardness 40 – 50 HRC (392 – 513 HV)
Tensile Strength 1275 MPa min.
Surface Treatment Mechanical Zinc Plating (GB/T 17460)
Coating Thickness 8 – 25 um
Operating Temperature -40°C to +120°C
RoHS / REACH Compliant

Chemical Composition — 70# Spring Steel (GB/T 699)

Element C Mn Si P max S max Cr max Ni max
Content % 0.67–0.75 0.50–0.80 0.17–0.37 0.035 0.035 0.25 0.25

Note: 70# steel (GB/T 699) is distinct from 65Mn spring steel (GB/T 1222). 70# has higher carbon (0.67–0.75%) and lower manganese (0.50–0.80%).

DIN 128B vs. DIN 128A — Key Differences

Feature DIN 128 Type B (Wavy) DIN 128 Type A (Curved)
Profile Wavy / corrugated (multiple waves) Single curved arc
Contact points Multi-point contact Continuous curved contact
Spring action Distributed multi-wave spring force Axial spring via single curve
Typical use General assemblies, light to medium loads Cheese head & pan head screws

Application Scenarios

  • Heavy machinery & industrial equipment — high spring force with outdoor corrosion protection
  • Automotive manufacturing — chassis, underbody, and engine assemblies exposed to moisture
  • Construction & steel structures — sheltered outdoor environments
  • Agricultural & mining equipment — high-vibration, humid conditions
  • Railway & transportation equipment — vibration resistance with corrosion protection
  • HVAC & mechanical systems — semi-outdoor or humid installations
  • Soft material assemblies — wavy profile distributes load without sharp edge marking

Product Photo Gallery

FULLERKREG DIN 128B Wavy Spring Lock Washer, 70# Spring Steel, Zinc Plated:

[ 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 and hardness
  • 🌍 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, hardness reports, RoHS declarations available
  • ⚡ Fast lead times — standard sizes in stock, ready to ship

Frequently Asked Questions

Q: What is DIN 128 Type B?
A: DIN 128 Type B is a wavy (corrugated) spring lock washer with multiple waves around the ring circumference. It generates distributed axial spring force with multi-point contact, providing anti-loosening performance without sharp edges or surface marking.

Q: Why mechanical zinc plating for 70# spring steel?
A: At 40–50 HRC, conventional electroplating introduces hydrogen embrittlement risk during acid pickling. Mechanical zinc plating uses cold mechanical impact with no acid pickling or electrical current, eliminating this risk while providing 8–25 um zinc coating for enhanced corrosion protection.

Q: What is 70# spring steel?
A: Grade 70 per GB/T 699, C 0.67–0.75%, achieving 40–50 HRC after quench and temper. Superior spring force, elastic recovery, and fatigue resistance vs. standard carbon steel. Distinct from 65Mn spring steel.

Q: DIN 128B vs. DIN 127B — which to choose?
A: DIN 128B (wavy) has no sharp edges and does not mark bearing surfaces — ideal for soft materials and coated surfaces. DIN 127B (helical split) provides stronger anti-loosening via bite-in effect — better for heavy-duty assemblies where surface marking is acceptable.

Q: Do you provide material test certificates?
A: Yes. Mill certificates, hardness reports, chemical composition reports, and RoHS declarations available upon request.

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