At Ananka Fasteners Pvt Ltd, we manufacture fasteners to the dimensional requirements of ASME B18.21.3. Double-coil helical spring-lock washers – two-turn spring washers giving greater axial take-up and vibration resistance than single-coil washers. Equivalent in form to DIN 7980 heavy / BS 4464 double-coil washers.
Double-coil helical spring-lock washers – two-turn spring washers giving greater axial take-up and vibration resistance than single-coil washers. Equivalent in form to DIN 7980 heavy / BS 4464 double-coil washers.
Double-coil helical spring-lock washer
Key dimensions for common sizes are listed below.
| Nominal Size | Inside Dia. min (mm) | Outside Dia. max (mm) | Section Width (mm) | Section Thickness (mm) |
|---|---|---|---|---|
| M5 | 5.1 | 10.7 | 1.6 | 1.2 |
| M6 | 6.1 | 12.3 | 1.8 | 1.5 |
| M8 | 8.1 | 15.5 | 2.1 | 1.6 |
| M10 | 10.2 | 18.9 | 2.6 | 2.0 |
| M12 | 12.2 | 22.3 | 3.1 | 2.5 |
| M14 | 14.2 | 25.5 | 3.6 | 2.8 |
| M16 | 16.2 | 28.7 | 4.1 | 3.2 |
| M20 | 20.2 | 35.1 | 5.1 | 3.6 |
| M24 | 24.5 | 41.5 | 6.1 | 4.0 |
N/A (washer – no thread)
[‘ASME B18.21.1M’, ‘ASME B18.21.2M’, ‘DIN 7980’, ‘BS 4464’]
For the official ASME standards catalogue, see the ASME standards listing. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
We produce ASME B18.21.3 fasteners in carbon and alloy steel, austenitic, duplex and super-duplex stainless, and high-nickel, titanium and copper alloys — for structural, flanged, machinery and process applications worldwide.
For technical documentation and quotations, buyers can also review the Ananka Fasteners manufacturing and supply range or contact the team through the fastener enquiry and technical support page.
Ananka Fasteners supplies every lot with full material traceability and third-party testing on request.
Double-coil helical spring-lock washers – two-turn spring washers giving greater axial take-up and vibration resistance than single-coil washers. Equivalent in form to DIN 7980 heavy / BS 4464 double-coil washers.
Ananka Fasteners manufactures ASME B18.21.3 in sizes from M5–M24. See the Dimensional Table above for the complete size breakdown.
N/A (washer – no thread)
We produce ASME B18.21.3 fasteners in carbon and alloy steel, austenitic, duplex and super-duplex stainless, and high-nickel, titanium and copper alloys — for structural, flanged, machinery and process applications worldwide.
Yes. For a quotation, provide the required nominal size, material grade, quantity and any inspection or certificate requirements.
Need a fastener manufactured to ASME B18.21.3 for an industrial project? Send the required fastener type, size, material grade, quantity and certification requirements to Ananka Fasteners. Our team can review the requirement and provide technical and commercial information for standard or custom configurations.
Recommended RFQ details: ASME B18.21.3 requirement, nominal size, material grade, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
Dimensions compiled per ASME B18.21.3 and industry references; provided for reference only — confirm against the current edition of the standard before design use.
