Home » GB93-85 Lock Washer 65Mn Steel 430-510HV Zinc

GB93-85 Lock Washer 65Mn Steel 430-510HV Zinc

GB93-85 Helical Spring Lock Washer — 65Mn Spring Steel, 430–510HV, Zinc Plated

FULLERKREG GB93-85 helical spring lock washers are manufactured to GB 93-1987 standard in 65Mn high-manganese spring steel (per GB/T 1222) with mechanical zinc plating. 65Mn spring steel achieves 430–510 HV hardness after quench and temper, delivering high spring force, excellent elastic recovery, and superior fatigue resistance. Mechanical zinc plating provides enhanced corrosion protection without hydrogen embrittlement risk — the correct zinc process for high-hardness spring steel.

Product Highlights

  • Standard: GB 93-1987
  • Material: 65Mn Spring Steel (GB/T 1222)
  • Surface: Mechanical Zinc Plating (GB/T 17460) — no hydrogen embrittlement risk
  • Hardness: 430–510 HV (approx. 44–50 HRC) after quench and temper
  • Size Range: M2–M48
  • Corrosion Resistance: Enhanced — suitable for light outdoor and humid environments
  • RoHS and REACH Compliant

Dimensional Specifications — GB93 Lock Washers (65Mn Steel, Zinc)

Per GB 93-1987, all dimensions in mm.

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

Sizes in parentheses are non-preferred per GB93, available on request. Weights based on steel density 7.85 g/cm3.

Material Properties — 65Mn Spring Steel

Property Value
Material Grade 65Mn Spring Steel
GB Standard GB/T 1222, GB/T 4354
Heat Treatment Quench and Temper
Hardness 430–510 HV (approx. 44–50 HRC)
Tensile Strength 980 MPa min. (annealed) / 1275 MPa min. (after HT)
Surface Treatment Mechanical Zinc Plating (GB/T 17460)
Coating Thickness 8–25 um
Operating Temperature -40 to +120 C
RoHS / REACH Compliant

Chemical Composition — 65Mn Spring Steel (GB/T 1222)

Element C Mn Si P max S max Cr max Ni max
Content % 0.62–0.70 0.90–1.20 0.17–0.37 0.035 0.035 0.25 0.25

65Mn has higher manganese (0.90-1.20%) vs. 70# steel (0.50-0.80%), improving hardenability and toughness. The higher Mn content gives 65Mn better through-hardening for larger cross-sections.

65Mn vs. 70# Spring Steel

Property 65Mn (this product) 70# Steel
Carbon (C) 0.62–0.70% 0.67–0.75%
Manganese (Mn) 0.90–1.20% 0.50–0.80%
Hardness (this spec) 430–510 HV 392–513 HV
Hardenability Better (high Mn) Standard
GB Standard GB/T 1222 GB/T 699
Typical use Spring washers, clips, springs Spring washers, general springs

Surface Treatment — Mechanical Zinc Plating

At 430–510 HV hardness, conventional electroplating introduces hydrogen embrittlement risk. Mechanical zinc plating (tumbling with zinc powder and glass beads, no acid pickling, no electrical current) eliminates this risk while providing 8–25 um zinc coating.

  • No hydrogen embrittlement — safe for high-hardness spring steel
  • Uniform 8–25 um zinc coating on all surfaces
  • Enhanced corrosion resistance vs. black oxide
  • Bright silver-grey appearance
  • RoHS compliant — no hexavalent chromium

Product Photo Gallery

FULLERKREG GB93-85 Lock Washer, 65Mn Spring Steel, Zinc Plated:

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

Application Scenarios

  • Heavy machinery and industrial equipment — high spring force with corrosion protection
  • Automotive manufacturing — engine, chassis, suspension assemblies
  • Construction and steel structures in sheltered outdoor environments
  • Agricultural and mining equipment in high-vibration, humid conditions
  • Railway and transportation equipment
  • HVAC and mechanical systems in semi-outdoor installations
  • GB-standard bolt assemblies requiring anti-loosening and corrosion resistance

Elastic Test Load — GB 9/T94.1-2008

Size M2 M3 M4 M5 M6 M8 M10 M12 M16 M20 M24 M30 M36 M42 M48
Load (N) 700 1760 3050 5050 7050 12900 20600 30000 56300 88000 127000 204000 298000 394000 518000

FAQ

Q: What is 65Mn spring steel? 65Mn (GB/T 1222) is a high-manganese spring steel with C 0.62-0.70% and Mn 0.90-1.20%. The high manganese content improves hardenability and toughness. After quench and temper, it achieves 430-510 HV, providing excellent spring force and fatigue resistance.

Q: Why mechanical zinc plating? At 430-510 HV, electroplating introduces hydrogen embrittlement risk. Mechanical plating uses cold impact with no acid pickling or electrical current, eliminating this risk.

Q: How does 65Mn differ from 70# steel? 65Mn has higher manganese (0.90-1.20% vs. 0.50-0.80%), giving better hardenability. 70# has slightly higher carbon (0.67-0.75% vs. 0.62-0.70%). Both are used for spring washers but are distinct grades per different GB standards.

Q: Non-preferred sizes available? Yes. M14, M18, M22, M27, M33, M39, M45 available on request.

Q: Certificates available? Yes. Mill certs, hardness reports, RoHS declarations on request.

FULLERKREG Fasteners — Precision GB and DIN Standard Fasteners, Direct from Manufacturer. Contact our sales team for wholesale inquiries and custom orders.

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