Phosphor Bronze (QSn4-0.3) Torsion Springs Reference Data: 24 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
- 3.37-38.15 mm (0.1327-1.502 in)
- Inside diameter
- 2.17-32.15 mm (0.0854-1.2657 in)
- Free length
- 1.01-176.9 mm (0.0398-6.9646 in)
- Spring rate
- 0.003-485.383 N/mm
- Maximum load
- 0.18-45577.42 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 Springs4 matching rowsDouble-Leg Torsion Springs Application Guide
- Hairpin Springs1 matching rowHairpin Springs Application Guide
- Single-Leg Torsion Springs6 matching rowsSingle-Leg Torsion Springs Application Guide
- Straight-Leg Torsion Springs9 matching rowsStraight-Leg Torsion Springs Application Guide
- Torsion Bar Springs4 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
Phosphor Bronze (QSn4-0.3) 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 | UNS C51000 |
|---|---|
| Standards | ASTM B159 wire; ASTM B103 strip; UNS C51000 |
| Corrosion behavior | good atmospheric corrosion resistance with useful electrical conductivity for contact and grounding springs |
| Temperature note | screening range -100 to 120 C, to be confirmed against final stress and environment |
| Tensile strength | 500-1000 MPa |
| Elastic modulus | 110-117 GPa |
| Shear modulus | 41-44 GPa |
| Density | 8.86 g/cm3 |
Matching Reference Configurations
| Model | Product | Wire / thickness | OD | ID | Free length | Rate (N/mm) | Material | Max load (N) |
|---|---|---|---|---|---|---|---|---|
| SW-030-0036-0668-0784 | Torsion Bar Springs | 0.3 mm | 3.57 mm | 2.97 mm | 66.84 mm | 0.339 | Phosphor Bronze (QSn4-0.3) | 5.47 |
| ST-030-0043-0052-0663 | Double-Leg Torsion Springs | 0.3 mm | 4.33 mm | 3.73 mm | 5.17 mm | 0.003 | Phosphor Bronze (QSn4-0.3) | 0.22 |
| ST-030-0050-0010-0621 | Double-Leg Torsion Springs | 0.3 mm | 4.98 mm | 4.38 mm | 1.01 mm | 0.015 | Phosphor Bronze (QSn4-0.3) | 2.13 |
| SW-030-0074-0583-0747 | Torsion Bar Springs | 0.3 mm | 7.39 mm | 6.79 mm | 58.33 mm | 0.033 | Phosphor Bronze (QSn4-0.3) | 0.57 |
| SW-030-0105-0766-0733 | Torsion Bar Springs | 0.3 mm | 10.48 mm | 9.88 mm | 76.62 mm | 0.013 | Phosphor Bronze (QSn4-0.3) | 0.18 |
| ST-040-0048-0038-0645 | Straight-Leg Torsion Springs | 0.4 mm | 4.77 mm | 3.97 mm | 3.79 mm | 0.019 | Phosphor Bronze (QSn4-0.3) | 1.13 |
| ST-040-0061-0050-0648 | Double-Leg Torsion Springs | 0.4 mm | 6.06 mm | 5.26 mm | 5.04 mm | 0.011 | Phosphor Bronze (QSn4-0.3) | 0.89 |
| ST-040-0071-0073-0720 | Single-Leg Torsion Springs | 0.4 mm | 7.14 mm | 6.34 mm | 7.26 mm | 0.006 | Phosphor Bronze (QSn4-0.3) | 0.58 |
| ST-060-0034-0109-0661 | Single-Leg Torsion Springs | 0.6 mm | 3.37 mm | 2.17 mm | 10.9 mm | 0.076 | Phosphor Bronze (QSn4-0.3) | 12.79 |
| SW-080-0094-1769-0781 | Hairpin Springs | 0.8 mm | 9.38 mm | 7.78 mm | 176.9 mm | 0.339 | Phosphor Bronze (QSn4-0.3) | 16.02 |
| SW-080-0101-0438-0780 | Torsion Bar Springs | 0.8 mm | 10.14 mm | 8.54 mm | 43.75 mm | 0.274 | Phosphor Bronze (QSn4-0.3) | 1.96 |
| ST-100-0066-0128-0594 | Single-Leg Torsion Springs | 1 mm | 6.58 mm | 4.58 mm | 12.81 mm | 0.419 | Phosphor Bronze (QSn4-0.3) | 22.48 |
| ST-150-0119-0246-0600 | Straight-Leg Torsion Springs | 1.5 mm | 11.94 mm | 8.94 mm | 24.56 mm | 0.851 | Phosphor Bronze (QSn4-0.3) | 135.53 |
| ST-150-0195-0072-0672 | Straight-Leg Torsion Springs | 1.5 mm | 19.54 mm | 16.54 mm | 7.22 mm | 1.677 | Phosphor Bronze (QSn4-0.3) | 53.5 |
| ST-180-0254-0294-0692 | Straight-Leg Torsion Springs | 1.8 mm | 25.42 mm | 21.82 mm | 29.42 mm | 0.832 | Phosphor Bronze (QSn4-0.3) | 119.09 |
| ST-200-0175-0255-0604 | Straight-Leg Torsion Springs | 2 mm | 17.51 mm | 13.51 mm | 25.54 mm | 2.356 | Phosphor Bronze (QSn4-0.3) | 358.32 |
| ST-200-0266-0357-0657 | Straight-Leg Torsion Springs | 2 mm | 26.57 mm | 22.57 mm | 35.71 mm | 1.095 | Phosphor Bronze (QSn4-0.3) | 138.01 |
| ST-250-0148-0476-0693 | Single-Leg Torsion Springs | 2.5 mm | 14.81 mm | 9.81 mm | 47.56 mm | 4.844 | Phosphor Bronze (QSn4-0.3) | 493.14 |
| ST-250-0359-0250-0696 | Straight-Leg Torsion Springs | 2.5 mm | 35.89 mm | 30.89 mm | 25.02 mm | 3.388 | Phosphor Bronze (QSn4-0.3) | 580.99 |
| ST-300-0269-0405-0674 | Single-Leg Torsion Springs | 3 mm | 26.92 mm | 20.92 mm | 40.49 mm | 7.373 | Phosphor Bronze (QSn4-0.3) | 999.1 |
| ST-300-0382-0124-0682 | Single-Leg Torsion Springs | 3 mm | 38.15 mm | 32.15 mm | 12.41 mm | 15.787 | Phosphor Bronze (QSn4-0.3) | 896.72 |
| ST-400-0340-0508-0655 | Straight-Leg Torsion Springs | 4 mm | 34 mm | 26 mm | 50.81 mm | 19.33 | Phosphor Bronze (QSn4-0.3) | 966.5 |
| ST-400-0345-0206-0640 | Straight-Leg Torsion Springs | 4 mm | 34.48 mm | 26.48 mm | 20.57 mm | 49.149 | Phosphor Bronze (QSn4-0.3) | 2010.21 |
| ST-600-0263-0238-0671 | Double-Leg Torsion Springs | 6 mm | 26.27 mm | 14.27 mm | 23.83 mm | 485.383 | Phosphor Bronze (QSn4-0.3) | 45577.42 |
Using This Material Data
forming, age hardening or stress relief may be required; plating is often selected for contact resistance and solderability
Need to choose between grades? Material selection belongs in the Materials section rather than this data page. Open Copper Alloy Spring Materials →
CustomSprings Engineering Catalog
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Frequently Asked Questions
Can CustomSprings manufacture springs in Phosphor Bronze (QSn4-0.3)?
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.