Oil-Tempered Spring Wire (SWO) Extension Springs Reference Data: 21 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
- 1.44-48.3 mm (0.0567-1.9016 in)
- Inside diameter
- 1.14-40.3 mm (0.0449-1.5866 in)
- Free length
- 7.89-185.67 mm (0.3106-7.3098 in)
- Spring rate
- 0.048-24.143 N/mm
- Maximum load
- 0.21-925.68 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 Springs3 matching rowsEnglish-Hook Extension Springs Application Guide
- German-Hook Extension Springs8 matching rowsGerman-Hook Extension Springs Application Guide
- Offset-Hook Extension Springs2 matching rowsOffset-Hook Extension Springs Application Guide
- Round-Hook Extension Springs8 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
Oil-Tempered Spring Wire (SWO) 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 | ASTM A229/ EN 10270-2 FD |
|---|---|
| Standards | ASTM A229; EN 10270-2; JIS G3560; GB/ T 18983 |
| 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 150 C, to be confirmed against final stress and environment |
| Tensile strength | 1000-1900 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) |
|---|---|---|---|---|---|---|---|---|
| SE-015-0014-0099-0582 | Round-Hook Extension Springs | 0.15 mm | 1.44 mm | 1.14 mm | 9.89 mm | 0.048 | Oil-Tempered Spring Wire (SWO) | 0.21 |
| SE-030-0024-0116-0555 | Offset-Hook Extension Springs | 0.3 mm | 2.4 mm | 1.8 mm | 11.57 mm | 0.286 | Oil-Tempered Spring Wire (SWO) | 1.01 |
| SE-030-0033-0079-0493 | English-Hook Extension Springs | 0.3 mm | 3.3 mm | 2.7 mm | 7.89 mm | 0.173 | Oil-Tempered Spring Wire (SWO) | 0.65 |
| SE-030-0034-0207-0580 | Round-Hook Extension Springs | 0.3 mm | 3.39 mm | 2.79 mm | 20.67 mm | 0.048 | Oil-Tempered Spring Wire (SWO) | 0.27 |
| SE-040-0020-0093-0433 | English-Hook Extension Springs | 0.4 mm | 1.99 mm | 1.19 mm | 9.27 mm | 4.952 | Oil-Tempered Spring Wire (SWO) | 10.29 |
| SE-050-0045-0378-0457 | German-Hook Extension Springs | 0.5 mm | 4.52 mm | 3.52 mm | 37.77 mm | 0.164 | Oil-Tempered Spring Wire (SWO) | 1.78 |
| SE-060-0045-0317-0507 | Round-Hook Extension Springs | 0.6 mm | 4.52 mm | 3.32 mm | 31.66 mm | 0.519 | Oil-Tempered Spring Wire (SWO) | 3.71 |
| SE-060-0066-0377-0588 | German-Hook Extension Springs | 0.6 mm | 6.55 mm | 5.35 mm | 37.67 mm | 0.131 | Oil-Tempered Spring Wire (SWO) | 0.83 |
| SE-150-0128-0510-0447 | German-Hook Extension Springs | 1.5 mm | 12.75 mm | 9.75 mm | 50.96 mm | 1.422 | Oil-Tempered Spring Wire (SWO) | 10.26 |
| SE-180-0130-0915-0422 | Offset-Hook Extension Springs | 1.8 mm | 13 mm | 9.4 mm | 91.48 mm | 1.882 | Oil-Tempered Spring Wire (SWO) | 32.63 |
| SE-180-0148-0375-0545 | English-Hook Extension Springs | 1.8 mm | 14.77 mm | 11.17 mm | 37.48 mm | 6.091 | Oil-Tempered Spring Wire (SWO) | 38.29 |
| SE-180-0200-0899-0538 | Round-Hook Extension Springs | 1.8 mm | 19.98 mm | 16.38 mm | 89.88 mm | 0.433 | Oil-Tempered Spring Wire (SWO) | 8.02 |
| SE-200-0241-0707-0539 | Round-Hook Extension Springs | 2 mm | 24.06 mm | 20.06 mm | 70.72 mm | 0.549 | Oil-Tempered Spring Wire (SWO) | 5.53 |
| SE-300-0198-1363-0570 | German-Hook Extension Springs | 3 mm | 19.8 mm | 13.8 mm | 136.33 mm | 5.623 | Oil-Tempered Spring Wire (SWO) | 127.14 |
| SE-300-0278-1335-0438 | German-Hook Extension Springs | 3 mm | 27.79 mm | 21.79 mm | 133.48 mm | 1.581 | Oil-Tempered Spring Wire (SWO) | 47.56 |
| SE-300-0328-1834-0502 | Round-Hook Extension Springs | 3 mm | 32.85 mm | 26.85 mm | 183.38 mm | 0.614 | Oil-Tempered Spring Wire (SWO) | 23.57 |
| SE-400-0295-0591-0508 | German-Hook Extension Springs | 4 mm | 29.52 mm | 21.52 mm | 59.13 mm | 24.143 | Oil-Tempered Spring Wire (SWO) | 237.03 |
| SE-400-0395-1513-0527 | Round-Hook Extension Springs | 4 mm | 39.49 mm | 31.49 mm | 151.27 mm | 2.192 | Oil-Tempered Spring Wire (SWO) | 58.04 |
| SE-400-0483-1628-0499 | Round-Hook Extension Springs | 4 mm | 48.3 mm | 40.3 mm | 162.83 mm | 0.96 | Oil-Tempered Spring Wire (SWO) | 21.03 |
| SE-500-0279-1857-0528 | German-Hook Extension Springs | 5 mm | 27.87 mm | 17.87 mm | 185.67 mm | 21.409 | Oil-Tempered Spring Wire (SWO) | 925.68 |
| SE-500-0306-1651-0483 | German-Hook Extension Springs | 5 mm | 30.61 mm | 20.61 mm | 165.1 mm | 15.374 | Oil-Tempered Spring Wire (SWO) | 372.63 |
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 Oil-Tempered Spring Wire (SWO)?
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.