Materials
Spring steel, stainless steel and phosphor bronze are common material categories for this product. State the grade and condition in the order specification.
GB/T 93
Normal-Type Spring Lock Washer
GB/T 93-2025 normal-type single-coil spring lock washers in Φ1.6–Φ48. State the nominal size, material, finish, quantity and packaging requirements in the RFQ. Legacy documents citing GB/T 93-1987 require an edition review.
Specification standardGB/T 93-2025Current standard · Φ1.6–Φ48
GB/T 93Product specifications
Product Specifications
Review the standard, structure, nominal range and ordering fields for this product family.
Product standardGB/T 93
Specification standardGB/T 93-2025
Product typeNormal-Type Spring Lock Washer
Nominal rangeΦ1.6–Φ48
Material / elasticityConfirm with material and order conditions
RFQ informationConfirm material, finish, quantity, packaging and documents
Specification table
GB/T 93-2025 Dimensions
Search, copy or scroll through the dimensional rows, then confirm the edition and order requirements in the RFQ.
Technical Drawing
Product Drawing
Spring Lock Washer
- d
- Hole diameter
- h
- Section thickness
- H
- Free height
- n
- Section width
Read these symbols alongside the dimension table below. Confirm the standard edition and order drawing for the selected size.
View full-size drawing ↗Download drawing ↓| Nominal size | d min | d max | h nominal | h min | h max | H min | H max | n min | n max | Preference |
|---|---|---|---|---|---|---|---|---|---|---|
| Φ1.6 | 1.7 | 1.95 | 0.5 | 0.42 | 0.58 | 1 | 1.25 | 0.42 | 0.58 | Preferred |
| Φ2 | 2.1 | 2.35 | 0.5 | 0.42 | 0.58 | 1 | 1.25 | 0.42 | 0.58 | Preferred |
| Φ2.5 | 2.6 | 2.85 | 0.65 | 0.57 | 0.73 | 1.3 | 1.63 | 0.57 | 0.73 | Preferred |
| Φ3 | 3.1 | 3.4 | 0.8 | 0.7 | 0.9 | 1.6 | 2 | 0.7 | 0.9 | Preferred |
| Φ4 | 4.1 | 4.4 | 1.1 | 1 | 1.2 | 2.2 | 2.75 | 1 | 1.2 | Preferred |
| Φ5 | 5.1 | 5.4 | 1.3 | 1.2 | 1.4 | 2.6 | 3.25 | 1.2 | 1.4 | Preferred |
| Φ6 | 6.1 | 6.5 | 1.6 | 1.5 | 1.7 | 3.2 | 4 | 1.5 | 1.7 | Preferred |
| Φ8 | 8.1 | 8.5 | 2.1 | 2 | 2.2 | 4.2 | 5.25 | 2 | 2.2 | Preferred |
| Φ10 | 10.2 | 10.7 | 2.6 | 2.45 | 2.75 | 5.2 | 6.5 | 2.45 | 2.75 | Preferred |
| Φ12 | 12.2 | 12.7 | 3.1 | 2.95 | 3.25 | 6.2 | 7.75 | 2.95 | 3.25 | Preferred |
| Φ14 | 14.2 | 14.7 | 3.6 | 3.4 | 3.8 | 7.2 | 9 | 3.4 | 3.8 | Non-preferred |
| Φ16 | 16.2 | 16.8 | 4.1 | 3.9 | 4.3 | 8.2 | 10.25 | 3.9 | 4.3 | Preferred |
| Φ18 | 18.2 | 18.9 | 4.5 | 4.3 | 4.7 | 9 | 11.25 | 4.3 | 4.7 | Non-preferred |
| Φ20 | 20.2 | 21 | 5 | 4.8 | 5.2 | 10 | 12.5 | 4.8 | 5.2 | Preferred |
| Φ22 | 22.3 | 23.1 | 5.5 | 5.3 | 5.7 | 11 | 13.75 | 5.3 | 5.7 | Non-preferred |
| Φ24 | 24.3 | 25.3 | 6 | 5.8 | 6.2 | 12 | 15 | 5.8 | 6.2 | Preferred |
| Φ27 | 27.3 | 28.3 | 6.8 | 6.5 | 7.1 | 13.6 | 17 | 6.5 | 7.1 | Non-preferred |
| Φ30 | 30.3 | 31.3 | 7.5 | 7.2 | 7.8 | 15 | 18.75 | 7.2 | 7.8 | Preferred |
| Φ33 | 33.3 | 34.5 | 8.5 | 8.2 | 8.8 | 17 | 21.25 | 8.2 | 8.8 | Non-preferred |
| Φ36 | 36.3 | 37.5 | 9 | 8.7 | 9.3 | 18 | 22.5 | 8.7 | 9.3 | Preferred |
| Φ39 | 39.3 | 40.5 | 10 | 9.7 | 10.3 | 20 | 25 | 9.7 | 10.3 | Non-preferred |
| Φ42 | 42.3 | 43.5 | 10.5 | 10.2 | 10.8 | 21 | 26.25 | 10.2 | 10.8 | Preferred |
| Φ45 | 45.3 | 46.5 | 11 | 10.7 | 11.3 | 22 | 27.5 | 10.7 | 11.3 | Non-preferred |
| Φ48 | 48.3 | 49.5 | 12 | 11.7 | 12.3 | 24 | 30 | 11.7 | 12.3 | Preferred |
Standard references
Dimension fields are organised to GB/T 93-2025. State the standard edition, nominal size and delivery requirements in the RFQ.
Technical Requirements
Product Requirements
Confirm material, finish, inspection, marking and packaging requirements for the selected product.
Elasticity and Hydrogen Embrittlement
Elasticity, torsion and hydrogen-embrittlement requirements should be reviewed with the material and manufacturing route. Electroplated spring-steel parts require a defined hydrogen-relief process.
Surface Condition
Specify the coating or cleaning system, passivation requirement and limits for harmful surface defects.
Inspection and Packaging
Acceptance, marking and packaging requirements should be agreed during quotation, including lot identification and required documents.
Surface Finishes
Surface Finishes
Choose the finish to suit your application.
Explore how each finish is made and what it offers.01Black OxideChemical Conversion · Black Finish
Black oxide is a chemical conversion process that forms a black oxide film on iron or steel. It retains the underlying metal texture and is commonly followed by oiling, waxing or sealing.
Process Characteristics
The thin conversion film has little effect on dimensions and suits mechanical parts requiring a dark finish. Corrosion protection depends largely on the subsequent oil or sealant layer.
03Yellow Zinc PlatedZinc Electroplating · Coloured Passivation
Yellow zinc uses coloured passivation over an electroplated zinc layer, producing yellow, gold or iridescent tones. Zinc remains the underlying protective layer; the passivation film creates the surface colour.
Process Characteristics
It combines a distinctive metallic appearance with corrosion protection. Colour intensity does not indicate a corrosion-resistance grade; performance depends on the complete coating and post-treatment system.
05Mechanical Zinc PlatingBarrel Deposition · Mechanical Bonding
Mechanical zinc plating tumbles parts with zinc powder, glass beads and process chemicals in a barrel. The beads repeatedly impact the surface, building a mechanically bonded zinc coating with a typically matt grey appearance.
Process Characteristics
Deposition does not use an electric current and is suited to small parts such as washers and fasteners. Coverage depends on geometry and access for the beads, so deep holes and recesses can be difficult to coat evenly.
07Zinc-Nickel Alloy PlatingAlloy Electroplating · Corrosion Protection
Zinc-nickel plating co-deposits zinc and nickel onto a part by electroplating, followed by passivation or sealing. It can have a silver-grey appearance or other colours depending on the post-treatment.
Process Characteristics
The alloy deposit, passivation and sealer work together to provide corrosion protection for automotive and industrial fasteners. Performance depends on alloy composition, coating thickness and post-treatment.
02Blue-White Zinc PlatedZinc Electroplating · Blue Passivation
Blue-white zinc combines an electroplated zinc layer with blue or clear passivation. The resulting surface is typically silver-white with a slight blue tint, a familiar finish on washers and other fasteners.
Process Characteristics
Zinc provides sacrificial protection for the steel, while passivation slows corrosion of the zinc layer. The finish is relatively bright; corrosion performance depends on coating thickness, passivation and sealing.
04Hot-Dip GalvanizedMolten-Zinc Immersion · Protective Coating
Hot-dip galvanizing immerses cleaned iron or steel parts in molten zinc. Zinc reacts with the steel to form zinc-iron alloy layers beneath an outer zinc layer, typically giving a silver-grey appearance.
Process Characteristics
The generally substantial coating protects steel through both a physical barrier and sacrificial zinc action. It is widely used for outdoor and structural components, with coating build-up affecting holes and assembly clearances.
06DacrometZinc-Aluminium Flakes · Heat Curing
Dacromet is a non-electrolytic zinc-aluminium flake coating. A coating containing zinc and aluminium flakes is applied by dipping, dip-spin or spraying, then heat-cured to form a silver-grey protective layer.
Process Characteristics
Overlapping flakes create a barrier, supported by sacrificial zinc protection. Commonly used on fasteners, its performance varies with the formulation, topcoat and curing conditions.
08Teflon CoatingFluoropolymer Coating · Low Friction
Teflon coatings use fluoropolymer formulations, including PTFE-based systems. Application and curing create a functional film on the part, with colours such as blue or black depending on the formulation.
Process Characteristics
Key properties include low friction, nonstick behaviour and chemical resistance, supporting sliding and release applications. Temperature capability, wear resistance and protective performance vary by coating system.
DIN / ISO Cross-reference
International Cross-References
GB/T 93-2025 is the current reference for ordering and acceptance. DIN 127 Forms A and B are similarity references only, and no direct ISO equivalent should be substituted without a full technical comparison.
DINSimilar reference, not equivalent
DIN 127 Form a / Form B (1987)
Spring lock washers, Form A / Form BDIN 127 Forms A and B use tang ends and square ends respectively. Their end geometry, cross-section, size series, materials and tests differ from GB/T 93-2025, so they are not direct substitutes.
ReferenceChina National Standards Open System: GB/T 93-2025ISONo direct equivalent
No Direct ISO Equivalent
No direct ISO product equivalentGB/T 93-2025 does not indicate ISO adoption. Any similar international standard should be compared for structure, dimensions, materials and test requirements.
ReferenceChina National Standards Open System: GB/T 93-2025Technical reading
Related Resources
Standards and dimensions01
GB/T 93-2025 Normal-Type Spring Lock Washer
The current edition, size range, key dimensional fields, technical requirements and treatment of legacy GB/T 93-1987 purchase documents.
Selection guide02
Specifying Washer Finishes: Eight Processes and Purchasing Requirements
How appearance, coating system, corrosion target, dimensional effect and hydrogen embrittlement affect finish selection.
Selection guide03
What Should an Industrial Washer Purchase List Contain?
A practical field structure covering product, delivery and contact information for a washer purchase list.
FAQ
GB/T 93 Questions
01Which edition of GB/T 93 is current?
GB/T 93-2025 is current and has been effective since 1 February 2026. GB/T 93-1987 has been withdrawn.
02Is DIN 127 directly equivalent?
No. DIN 127 A/B is only a similar reference; ends, section, dimensions, material and tests must be compared individually.
03Which finishes can be quoted?
Black oxide, blue-white zinc, yellow zinc, hot-dip galvanizing, mechanical zinc plating, Dacromet, zinc-nickel alloy plating and Teflon coating can be quoted, subject to size, material, elasticity, dimensional and process review.
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Recommended descriptionGB/T 97 · 200HV · M16 · 50,000 PCS
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