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GB93 Lock Washer A2 Stainless

GB93 Helical Spring Lock Washer — A2 Stainless Steel (SUS304), Whitened & Passivated

FULLERKREG GB93 helical spring lock washers are manufactured to GB 93-1987 standard in A2 stainless steel (SUS304 / 0Cr18Ni9) with a whitened and passivated surface finish. GB93 is one of the most widely used domestic Chinese spring washer standards and remains in active use across machinery, equipment, and structural assemblies. The split helical design generates spring-back tension and a bite-in effect that resists loosening under vibration and dynamic loads. A2 stainless steel provides excellent corrosion resistance for general industrial, food processing, and outdoor applications.

Product Highlights

  • Standard: GB 93-1987
  • Material: A2 Stainless Steel (SUS304 / 0Cr18Ni9 / 1.4301)
  • Surface Treatment: Whitened & Passivated (bright silver, uniform stainless finish)
  • Size Range: M2 – M48
  • Function: Helical spring lock washer — anti-loosening via spring-back tension and bite-in effect
  • Hardness: ≥ 34 HRC or 336 HV (per GB 9/T94.1-2008)
  • Non-magnetic (austenitic), non-sparking
  • RoHS & REACH Compliant

Dimensional Specifications — GB93 Lock Washers (A2 Stainless, Whitened & Passivated)

All dimensions in millimeters (mm). Per GB 93-1987.

Size d min d max h nominal h min h max n min n max H min H max Weight (kg/1000pcs steel ref.)
M2 2.1 2.35 0.5 0.42 0.58 0.42 0.58 1.0 1.25 0.016
M2.5 2.6 2.85 0.65 0.57 0.73 0.57 0.73 1.3 1.63 0.033
M3 3.1 3.4 0.8 0.7 0.9 0.7 0.9 1.6 2.0 0.06
M4 4.1 4.4 1.1 1.0 1.2 1.0 1.2 2.2 2.75 0.15
M5 5.1 5.4 1.3 1.2 1.4 1.2 1.4 2.6 3.25 0.258
M6 6.1 6.68 1.6 1.5 1.7 1.5 1.7 3.2 4.0 0.47
M8 8.1 8.68 2.1 2.0 2.2 2.0 2.2 4.2 5.25 1.07
M10 10.2 10.9 2.6 2.45 2.75 2.45 2.75 5.2 6.5 2.06
M12 12.2 12.9 3.1 2.95 3.25 2.95 3.25 6.2 7.75 3.51
(M14) 14.2 14.9 3.6 3.4 3.8 3.4 3.8 7.2 9.0 5.51
M16 16.2 16.9 4.1 3.9 4.3 3.9 4.3 8.2 10.25 8.15
(M18) 18.2 19.04 4.5 4.3 4.7 4.3 4.7 9.0 11.25 10.98
M20 20.2 21.04 5.0 4.8 5.2 4.8 5.2 10.0 12.5 15.05
(M22) 22.5 23.34 5.5 5.3 5.7 5.3 5.7 11.0 13.75 20.24
M24 24.5 25.5 6.0 5.8 6.2 5.8 6.2 12.0 15.0 26.23
(M27) 27.5 28.5 6.8 6.5 7.1 6.5 7.1 13.6 17.0 37.88
M30 30.5 31.5 7.5 7.2 7.8 7.2 7.8 15.0 18.75 51.06
(M33) 33.5 34.7 8.5 8.2 8.8 8.2 8.8 17.0 21.25 72.43
M36 36.5 37.7 9.0 8.7 9.3 8.7 9.3 18.0 22.5 88.03
(M39) 39.5 40.7 10.0 9.7 10.3 9.7 10.3 20.0 25.0 118.2
M42 42.5 43.7 10.5 10.2 10.8 10.2 10.8 21.0 26.25 139.6
(M45) 45.5 46.7 11.0 10.7 11.3 10.7 11.3 22.0 27.5 163.4
M48 48.5 49.7 12.0 11.7 12.3 11.7 12.3 24.0 30.0 208.1

* Sizes in parentheses ( ) are non-preferred sizes. Weight reference values based on steel density ≈7.85 g/cm³. A2 stainless weights are approximately 1% higher. Please verify with your engineering team for critical applications.

Elastic Test Free Height — GB 9/T94.1-2008 Table 2

Minimum free height after elastic test (mm):

Size M3 M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30
Free height ≥ (mm) 0.9 1.0 1.25 1.6 2.1 2.4 2.8 3.2 3.8 3.8 4.4 4.4 5.6 5.6 8.0

* Elastic test free height for stainless steel and phosphor bronze spring washers is subject to bilateral agreement between supplier and buyer.

Elastic Test Load — GB 9/T94.1-2008 Table 3

Minimum elastic test load (N):

Size (mm) M2 M2.5 M3 M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 M39 M42 M45 M48
Test Load (N) 700 1,160 1,760 3,050 5,050 7,050 12,900 20,600 30,000 41,300 56,300 69,000 88,000 110,000 127,000 167,000 204,000 255,000 298,000 343,000 394,000 457,000 518,000

Material & Mechanical Properties — A2 Stainless Steel (SUS304)

Property Value
Material Grade A2 / SUS304 / 0Cr18Ni9 / 1.4301
GB Standard Reference GB/T 1220, GB/T 4240
Heat Treatment Annealed — ≥ 34 HRC or 336 HV
Hardness ≥ 34 HRC or 336 HV (per GB 9/T94.1-2008)
Density 7.93 g/cm³
Magnetic Non-magnetic (austenitic)
Operating Temperature -196°C to +300°C
Surface Treatment Simple treatment (whitened & passivated)
RoHS / REACH Compliant

Chemical Composition — A2 Stainless Steel (SUS304 / 0Cr18Ni9)

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

GB93 vs. DIN 127 — Key Differences

Feature GB 93-1987 DIN 127 Type B
Origin Chinese national standard German DIN standard
Size range M2 – M48 M2 – M80
Dimensional compatibility Largely compatible with DIN 127B for common sizes International reference standard
Common use region China domestic & export to Asia Europe, global industrial
Technical standard GB 9/T94.1-2008 DIN 127 / ISO 3506

How GB93 Lock Washers Work

  • 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
  • Anti-loosening: Friction between the washer and mating parts prevents joint loosening under dynamic and vibration loads
  • Pre-tension: Provides initial pre-tension to maintain connection stability in both static and dynamic conditions

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
  • Domestic Chinese machinery standards — GB93 is the standard spring washer for GB-standard bolt assemblies

Product Photo Gallery

Real product images — FULLERKREG GB93 Lock Washer, A2 Stainless Steel:

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

Packaging & Supply

Size Standard Pack (pcs) Bulk Carton (pcs) Weight per 1000 pcs (approx.)
M3 200 10,000 ~60 g
M4 200 5,000 ~150 g
M5 100 3,000 ~258 g
M6 100 2,000 ~470 g
M8 50 1,000 ~1,070 g
M10 50 500 ~2,060 g
M12 25 500 ~3,510 g
M16 25 200 ~8,150 g
M20 10 100 ~15,050 g
M24 10 50 ~26,230 g

Sizes M27–M48 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 GB/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 GB93 and how does it relate to DIN 127?
A: GB 93-1987 is the Chinese national standard for helical spring lock washers, equivalent in function to DIN 127 Type B. For common sizes (M2–M48), the dimensions are largely compatible. GB93 is the standard specification for spring washers used in GB-standard bolt assemblies in China.

Q: What does A2 stainless steel mean?
A: A2 refers to austenitic stainless steel grade 304 (SUS304 / 0Cr18Ni9 / 1.4301). 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: How does a GB93 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: 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 sizes in parentheses available?
A: Yes. Sizes shown in parentheses (e.g. M14, M18, M22) are non-preferred sizes per GB93 but are available upon request. Please contact FULLERKREG for availability and lead times.

Q: Are these washers RoHS compliant?
A: Yes. FULLERKREG A2 stainless steel GB93 lock washers are fully RoHS and REACH compliant. Compliance documentation is available upon request.

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

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