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DIN 127 Lock Washer A2 Stainless

DIN 127 Type B Helical Spring Lock Washer — A2 Stainless Steel (SUS304), Whitened & Passivated

FULLERKREG DIN 127 Type B helical spring lock washers are manufactured to DIN 127 standard in A2 stainless steel (SUS304 / 1.4301) with a whitened and passivated surface finish. DIN 127 lock washers are among the most commonly used metric lock washers — the split helical design creates a spring-like action that resists loosening caused by vibration and dynamic loads. Type B (the standard type) has a slightly larger outer diameter and greater strength than Type A. A2 stainless steel provides excellent corrosion resistance for general industrial, food processing, and outdoor applications.

Product Highlights

  • Standard: DIN 127 Type B
  • Material: A2 Stainless Steel (SUS304 / 1.4301)
  • Surface Treatment: Whitened & Passivated (bright silver, uniform stainless finish)
  • Size Range: M2 – M80
  • Function: Helical spring lock washer — resists vibration loosening via spring-back tension
  • Type B: Standard type — larger OD and higher load capacity vs. Type A
  • Non-magnetic (austenitic), non-sparking
  • RoHS & REACH Compliant

Dimensional Specifications — DIN 127 Type B Lock Washers (A2 Stainless, Whitened & Passivated)

All dimensions in millimeters (mm). Tolerances per DIN 127.

Nominal Size (d) d1 (min) D (max) B (mm) S / H (mm) H min (mm) Weight (kg/100pcs)
M2 2.1 4.4 1.2 0.5 1.0 0.05
M2.5 2.6 5.1 1.5 0.6 1.2 0.09
M3 3.1 6.2 1.8 0.8 1.6 0.11
M3.5 3.6 7.2 2.0 0.9 1.8 0.18
M4 4.1 7.9 2.3 1.0 2.0 0.24
M5 5.1 9.8 2.8 1.2 2.4 0.46
M6 6.1 11.8 3.3 1.6 3.2 0.83
M8 8.1 15.1 4.1 2.0 4.0 1.8
M10 10.2 18.1 4.9 2.5 5.0 3.4
M12 12.2 21.1 5.8 3.0 6.0 5.67
M14 14.2 24.1 6.5 3.5 7.0 8.72
M16 16.2 27.4 7.5 4.0 8.0 14.2
M18 18.2 29.4 7.5 4.0 8.0 15.7
M20 20.2 33.6 8.5 5.0 10.0 29.2
M22 22.5 35.9 8.5 5.0 10.0 32.0
M24 24.5 40.0 10.0 6.0 12.0 56.2
M27 27.5 44.0 10.0 6.0 12.0 66.0
M30 30.5 48.2 11.0 6.0 12.0 82.0
M33 33.5 52.2 11.0 6.0 12.0 95.0
M36 36.5 57.2 12.0 7.0 14.0 147
M39 39.5 62.2 12.0 7.0 14.0 171
M42 42.5 67.2 13.0 8.0 16.0 253
M45 45.5 71.2 13.0 8.0 16.0 282
M48 48.5 75.2 14.0 8.0 16.0 325
M52 52.5 82.2 15.0 9.0 18.0 490
M56 56.5 87.2 15.0 9.0 18.0 540
M60 60.5 92.2 16.0 10.0 20.0 730
M64 64.5 98.2 16.0 10.0 20.0 810
M68 68.5 104.2 18.0 10.0 20.0 1,020
M72 72.5 109.2 18.0 10.0 20.0 1,110
M76 76.5 115.2 18.0 11.0 22.0 1,370
M80 80.5 121.2 20.0 11.0 22.0 1,770

* All dimensions conform to DIN 127 Type B. Please verify with your engineering team for critical applications.

Material & Mechanical Properties — A2 Stainless Steel (SUS304)

Property Value
Material Grade A2 / SUS304 / 1.4301
Steel Group Austenitic
Strength Class A2-50 / A2-70
Tensile Strength (Rm) ≥ 500 MPa (Class 50)  /  ≥ 700 MPa (Class 70)
Proof Load Stress 700 MPa (per DIN 127 / ISO 3506)
Hardness (HV) ≤ 250 HV
Density 7.93 g/cm³
Magnetic Non-magnetic (austenitic)
Operating Temperature -196°C to +300°C
RoHS / REACH Compliant

Chemical Composition — A2 Stainless Steel (SUS304 / 1.4301)

Element C (max) Cr Ni Mn (max) Si (max) P (max) S (max)
Content (%) 0.07 17.5 – 19.5 8.0 – 10.5 2.0 1.0 0.045 0.030

A2 Stainless Steel — Property Strength Classes

Steel Group Grade Strength Class Made From Characteristics
Austenitic A2 50 A1, A2 Soft annealed, bored and soft pressed types; tensile strength ≥ 500 MPa; dia. ≤ M39
A2 70 A2, A4 Cold worked, normal strength; tensile strength ≥ 700 MPa; dia. ≤ M39; with anti-pitting treatment

How DIN 127 Lock Washers Work

DIN 127 helical spring lock washers function through a combination of two mechanisms:

  • Spring-back tension: The helical split creates a spring that maintains clamp load as the joint settles, compensating for relaxation and embedding losses
  • Bite-in effect: The sharp edges at the split ends bite into both the bearing surface and the nut/bolt head, resisting rotational loosening under vibration
  • Type B advantage: Greater width (B dimension) and thickness (S) vs. Type A — higher spring force and load capacity for demanding applications

Application Scenarios

  • General machinery & equipment assembly — wherever vibration loosening is a concern
  • Food processing & pharmaceutical equipment — A2 stainless is hygienic and easy to clean
  • Chemical processing plants — resistance to mild acids and alkalis
  • Outdoor & architectural hardware — weather-resistant without surface coating
  • Electrical enclosures & control panels — non-magnetic, no interference with sensitive electronics
  • Automotive & transportation — engine compartments, chassis, and suspension assemblies
  • HVAC & piping systems — vibration-prone ductwork and equipment mounting
  • Marine (above waterline) — suitable for non-immersed saltwater-adjacent environments

Product Photo Gallery

Real product images — FULLERKREG DIN 127 Type B Lock Washer, A2 Stainless Steel:

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

Packaging & Supply

Size Standard Pack (pcs) Bulk Carton (pcs) Weight per 100 pcs (approx.)
M3 200 10,000 ~11 g
M4 200 5,000 ~24 g
M5 100 3,000 ~46 g
M6 100 2,000 ~83 g
M8 50 1,000 ~180 g
M10 50 500 ~340 g
M12 25 500 ~567 g
M16 25 200 ~1,420 g
M20 10 100 ~2,920 g
M24 10 50 ~5,620 g

Sizes M27–M80 available upon request. Custom packaging and labeling available for OEM / wholesale orders. Contact FULLERKREG for bulk pricing.

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 the difference between DIN 127 Type A and Type B?
A: Type B (standard type) has a larger outer diameter and greater width (B dimension) than Type A, resulting in higher spring force and load capacity. Type B is the more commonly specified and stocked type. FULLERKREG supplies Type B as standard.

Q: How does a helical spring lock washer prevent loosening?
A: The split helical design creates spring-back tension that maintains clamp load as the joint settles. The sharp edges at the split ends also bite into the bearing surface and fastener, resisting rotational loosening under vibration and dynamic loads.

Q: What is A2 stainless steel?
A: A2 refers to austenitic stainless steel grade 304 (SUS304 / 1.4301) per ISO 3506. It contains approximately 18% chromium and 8% nickel, offering excellent corrosion resistance in most atmospheric and freshwater environments. It is non-magnetic and suitable for food-contact applications.

Q: Is A2 stainless suitable for outdoor use?
A: Yes. A2 stainless steel provides excellent corrosion resistance in outdoor atmospheric conditions, fresh water, and mild chemical environments. For seawater or chloride-rich environments, A4 (SUS316) is recommended.

Q: Are these washers RoHS compliant?
A: Yes. FULLERKREG A2 stainless steel lock washers are fully RoHS and REACH compliant. Compliance documentation is available upon request.

Q: Can I order mixed sizes?
A: Yes. FULLERKREG supports mixed-size wholesale orders. Please contact us with your size breakdown and quantities for a custom quotation.

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