Phosphor Bronze (QSn4-0.3) Extension Springs Reference Data: 15 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
- 0.15-5 mm (0.0059-0.1969 in)
- Outside diameter
- 1.2-57.84 mm (0.0472-2.2772 in)
- Inside diameter
- 0.8-47.84 mm (0.0315-1.8835 in)
- Free length
- 4.48-376.52 mm (0.1764-14.8236 in)
- Spring rate
- 0.011-1.925 N/mm
- Maximum load
- 0.03-62.69 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.
- English-Hook Extension Springs5 matching rowsEnglish-Hook Extension Springs Application Guide
- German-Hook Extension Springs5 matching rowsGerman-Hook Extension Springs Application Guide
- Offset-Hook Extension Springs2 matching rowsOffset-Hook Extension Springs Application Guide
- Round-Hook Extension Springs3 matching rowsRound-Hook Extension 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) extension 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) |
|---|---|---|---|---|---|---|---|---|
| SE-015-0022-0045-0551 | Round-Hook Extension Springs | 0.15 mm | 2.22 mm | 1.92 mm | 4.48 mm | 0.013 | Phosphor Bronze (QSn4-0.3) | 0.03 |
| SE-020-0012-0111-0444 | German-Hook Extension Springs | 0.2 mm | 1.2 mm | 0.8 mm | 11.11 mm | 0.21 | Phosphor Bronze (QSn4-0.3) | 0.92 |
| SE-020-0019-0114-0573 | English-Hook Extension Springs | 0.2 mm | 1.94 mm | 1.54 mm | 11.45 mm | 0.033 | Phosphor Bronze (QSn4-0.3) | 0.19 |
| SE-020-0026-0144-0479 | English-Hook Extension Springs | 0.2 mm | 2.56 mm | 2.16 mm | 14.44 mm | 0.011 | Phosphor Bronze (QSn4-0.3) | 0.06 |
| SE-030-0026-0128-0475 | German-Hook Extension Springs | 0.3 mm | 2.63 mm | 2.03 mm | 12.85 mm | 0.106 | Phosphor Bronze (QSn4-0.3) | 0.49 |
| SE-030-0035-0118-0429 | English-Hook Extension Springs | 0.3 mm | 3.5 mm | 2.9 mm | 11.76 mm | 0.043 | Phosphor Bronze (QSn4-0.3) | 0.17 |
| SE-050-0047-0312-0425 | German-Hook Extension Springs | 0.5 mm | 4.66 mm | 3.66 mm | 31.25 mm | 0.083 | Phosphor Bronze (QSn4-0.3) | 0.74 |
| SE-050-0052-0282-0581 | German-Hook Extension Springs | 0.5 mm | 5.2 mm | 4.2 mm | 28.16 mm | 0.068 | Phosphor Bronze (QSn4-0.3) | 0.6 |
| SE-050-0052-0208-0463 | English-Hook Extension Springs | 0.5 mm | 5.22 mm | 4.22 mm | 20.8 mm | 0.097 | Phosphor Bronze (QSn4-0.3) | 0.46 |
| SE-060-0044-0410-0509 | English-Hook Extension Springs | 0.6 mm | 4.45 mm | 3.25 mm | 40.97 mm | 0.206 | Phosphor Bronze (QSn4-0.3) | 2.56 |
| SE-060-0080-0416-0495 | German-Hook Extension Springs | 0.6 mm | 7.97 mm | 6.77 mm | 41.55 mm | 0.03 | Phosphor Bronze (QSn4-0.3) | 0.25 |
| SE-200-0134-1165-0514 | Round-Hook Extension Springs | 2 mm | 13.39 mm | 9.39 mm | 116.54 mm | 1.297 | Phosphor Bronze (QSn4-0.3) | 30.6 |
| SE-400-0315-1736-0435 | Offset-Hook Extension Springs | 4 mm | 31.52 mm | 23.52 mm | 173.61 mm | 1.925 | Phosphor Bronze (QSn4-0.3) | 62.69 |
| SE-500-0519-3765-0492 | Round-Hook Extension Springs | 5 mm | 51.93 mm | 41.93 mm | 376.52 mm | 0.535 | Phosphor Bronze (QSn4-0.3) | 43.27 |
| SE-500-0578-2537-0585 | Offset-Hook Extension Springs | 5 mm | 57.84 mm | 47.84 mm | 253.74 mm | 0.536 | Phosphor Bronze (QSn4-0.3) | 37.77 |
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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Send your dimensions, quantity and drawing for engineering review.
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.