Music Wire (SWP-A) Torsion Springs Reference Data: 27 catalog-backed reference configurations are available for sizing review. Use the ranges below to compare the starting envelope before submitting a drawing for final quotation.
- Wire diameter
- 0.3-6 mm (0.0118-0.2362 in)
- Outside diameter
- 1.62-84.3 mm (0.0638-3.3189 in)
- Inside diameter
- 1.02-72.3 mm (0.0402-2.8465 in)
- Free length
- 2.39-194.59 mm (0.0941-7.661 in)
- Spring rate
- 0.02-234.726 N/mm
- Maximum load
- 1.17-15444.98 N
Catalog rows are reference configurations for custom design review. Final dimensions, loads, tolerances and material certifications are confirmed during quotation.
Products Represented in This Data
These rows show which product designs are represented in the reference data. Open the matching product for geometry, quotation inputs, application guidance and RFQ details.
- Double-Leg Torsion Springs7 matching rowsDouble-Leg Torsion Springs Application Guide
- Hairpin Springs4 matching rowsHairpin Springs Application Guide
- Single-Leg Torsion Springs7 matching rowsSingle-Leg Torsion Springs Application Guide
- Straight-Leg Torsion Springs7 matching rowsStraight-Leg Torsion Springs Application Guide
- Torsion Bar Springs2 matching rowsTorsion Bar Springs Application Guide
Related Spring Design Guides
Use these guides to define the working dimensions, loads and quotation requirements.
Engineering Material Reference
Music Wire (SWP-A) torsion springs reference data combines the published material properties with matching rows from the Spring Finder catalog. Use the product links in the table for product-specific design and quotation details.
| Primary grade | ASTM A228/ SWP-A/ B |
|---|---|
| Standards | ASTM A228; EN 10270-1 DH; JIS G3522; GB/ T 4358; applicable current standard |
| Corrosion behavior | low in bare condition; specify passivation, phosphate, zinc, black oxide, oil or coating when corrosion protection is required |
| Temperature note | screening range -40 to 120 C, to be confirmed against final stress and environment |
| Tensile strength | 1600-2600 MPa |
| Elastic modulus | 200-210 GPa |
| Shear modulus | 77-82 GPa |
| Density | 7.85 g/cm3 |
Matching Reference Configurations
| Model | Product | Wire / thickness | OD | ID | Free length | Rate (N/mm) | Material | Max load (N) |
|---|---|---|---|---|---|---|---|---|
| ST-030-0016-0034-0602 | Straight-Leg Torsion Springs | 0.3 mm | 1.62 mm | 1.02 mm | 3.42 mm | 0.031 | Music Wire (SWP-A) | 3.61 |
| ST-040-0025-0024-0683 | Double-Leg Torsion Springs | 0.4 mm | 2.48 mm | 1.68 mm | 2.39 mm | 0.126 | Music Wire (SWP-A) | 15.6 |
| ST-040-0026-0042-0715 | Single-Leg Torsion Springs | 0.4 mm | 2.64 mm | 1.84 mm | 4.16 mm | 0.062 | Music Wire (SWP-B) | 6.67 |
| ST-040-0061-0050-0691 | Straight-Leg Torsion Springs | 0.4 mm | 6.09 mm | 5.29 mm | 5.04 mm | 0.022 | Music Wire (SWP-A) | 1.17 |
| ST-040-0070-0044-0599 | Single-Leg Torsion Springs | 0.4 mm | 7.01 mm | 6.21 mm | 4.4 mm | 0.02 | Music Wire (SWP-A) | 2.69 |
| ST-050-0054-0066-0688 | Straight-Leg Torsion Springs | 0.5 mm | 5.41 mm | 4.41 mm | 6.64 mm | 0.059 | Music Wire (SWP-A) | 7.91 |
| ST-050-0054-0076-0636 | Double-Leg Torsion Springs | 0.5 mm | 5.41 mm | 4.41 mm | 7.63 mm | 0.051 | Music Wire (SWP-A) | 3.47 |
| ST-050-0066-0035-0714 | Single-Leg Torsion Springs | 0.5 mm | 6.57 mm | 5.57 mm | 3.52 mm | 0.084 | Music Wire (SWP-A) | 7.86 |
| ST-060-0089-0060-0666 | Double-Leg Torsion Springs | 0.6 mm | 8.88 mm | 7.68 mm | 6.02 mm | 0.092 | Music Wire (SWP-A) | 7.68 |
| SW-100-0155-1742-0724 | Torsion Bar Springs | 1 mm | 15.47 mm | 13.47 mm | 174.22 mm | 0.372 | Music Wire (SWP-B) | 18.07 |
| SW-100-0209-1946-0757 | Hairpin Springs | 1 mm | 20.9 mm | 18.9 mm | 194.59 mm | 0.434 | Music Wire (SWP-B) | 15.86 |
| SW-100-0239-0493-0793 | Hairpin Springs | 1 mm | 23.94 mm | 21.94 mm | 49.33 mm | 0.304 | Music Wire (SWP-B) | 3.84 |
| ST-120-0104-0072-0613 | Double-Leg Torsion Springs | 1.2 mm | 10.44 mm | 8.04 mm | 7.21 mm | 2.137 | Music Wire (SWP-A) | 360.48 |
| ST-120-0132-0224-0617 | Straight-Leg Torsion Springs | 1.2 mm | 13.21 mm | 10.81 mm | 22.37 mm | 0.557 | Music Wire (SWP-B) | 94.21 |
| SW-150-0138-1747-0762 | Torsion Bar Springs | 1.5 mm | 13.82 mm | 10.82 mm | 174.7 mm | 6.881 | Music Wire (SWP-B) | 158.74 |
| SW-150-0249-0545-0751 | Hairpin Springs | 1.5 mm | 24.9 mm | 21.9 mm | 54.54 mm | 1.004 | Music Wire (SWP-A) | 8.16 |
| ST-180-0137-0204-0609 | Straight-Leg Torsion Springs | 1.8 mm | 13.68 mm | 10.08 mm | 20.38 mm | 4.683 | Music Wire (SWP-B) | 540.9 |
| ST-180-0138-0182-0710 | Single-Leg Torsion Springs | 1.8 mm | 13.82 mm | 10.22 mm | 18.18 mm | 4.906 | Music Wire (SWP-A) | 310.08 |
| ST-180-0166-0341-0701 | Single-Leg Torsion Springs | 1.8 mm | 16.65 mm | 13.05 mm | 34.1 mm | 2.135 | Music Wire (SWP-B) | 241.48 |
| ST-180-0213-0366-0690 | Double-Leg Torsion Springs | 1.8 mm | 21.26 mm | 17.66 mm | 36.6 mm | 1.546 | Music Wire (SWP-A) | 84.11 |
| ST-200-0168-0255-0660 | Single-Leg Torsion Springs | 2 mm | 16.76 mm | 12.76 mm | 25.53 mm | 4.992 | Music Wire (SWP-B) | 305.48 |
| ST-300-0204-0582-0641 | Double-Leg Torsion Springs | 3 mm | 20.41 mm | 14.41 mm | 58.16 mm | 14.361 | Music Wire (SWP-A) | 512.68 |
| SW-300-0518-1312-0775 | Hairpin Springs | 3 mm | 51.78 mm | 45.78 mm | 131.18 mm | 0.706 | Music Wire (SWP-B) | 26.06 |
| ST-500-0323-0630-0669 | Straight-Leg Torsion Springs | 5 mm | 32.31 mm | 22.31 mm | 63.02 mm | 108.038 | Music Wire (SWP-B) | 7767.92 |
| ST-500-0468-0858-0627 | Straight-Leg Torsion Springs | 5 mm | 46.78 mm | 36.78 mm | 85.82 mm | 52.198 | Music Wire (SWP-B) | 2876.09 |
| ST-600-0634-0325-0647 | Double-Leg Torsion Springs | 6 mm | 63.44 mm | 51.44 mm | 32.48 mm | 234.726 | Music Wire (SWP-B) | 15444.98 |
| ST-600-0843-1253-0713 | Single-Leg Torsion Springs | 6 mm | 84.3 mm | 72.3 mm | 125.31 mm | 47.684 | Music Wire (SWP-A) | 7257.51 |
Using This Material Data
cold coiling or hot coiling, stress relief, shot peening and presetting may be specified; electroplating high-strength steel requires hydrogen-embrittlement controls
Need to choose between grades? Material selection belongs in the Materials section rather than this data page. Open Carbon & Alloy Spring Steels →
CustomSprings Engineering Catalog
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Frequently Asked Questions
Can CustomSprings manufacture springs in Music Wire (SWP-A)?
The material is included in the CustomSprings material library for RFQ screening. Final feasibility depends on wire or strip form, size, heat treatment, load, environment and quantity.
Does the material page guarantee certified properties?
No. The material values are engineering reference data. Certified properties or test reports must be specified during production quotation.
What if there are no matching reference rows?
Use the RFQ form with your drawing and application data. The material can still be reviewed as a made-to-drawing option.