4 mm Wire Torsion Springs Reference Data: 16 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
- 4-4 mm (0.1575-0.1575 in)
- Outside diameter
- 16.99-59.78 mm (0.6689-2.3535 in)
- Inside diameter
- 8.99-51.78 mm (0.3539-2.0386 in)
- Free length
- 15.65-194.56 mm (0.6161-7.6598 in)
- Spring rate
- 1.743-195.575 N/mm
- Maximum load
- 78.41-16721.66 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 Springs2 matching rowsDouble-Leg Torsion Springs Application Guide
- Hairpin Springs1 matching rowHairpin Springs Application Guide
- Single-Leg Torsion Springs5 matching rowsSingle-Leg Torsion Springs Application Guide
- Straight-Leg Torsion Springs6 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.
Sizing Overview
4 mm Wire torsion springs pages are useful when the available wire diameter is fixed and the outside diameter, free length or load target needs to be adjusted. The rows below combine multiple torsion springs product forms so you can compare nearby options before an RFQ review.
- Wire diameter
- 4-4 mm (0.1575-0.1575 in)
- Outside diameter
- 16.99-59.78 mm (0.6689-2.3535 in)
- Inside diameter
- 8.99-51.78 mm (0.3539-2.0386 in)
- Free length
- 15.65-194.56 mm (0.6161-7.6598 in)
- Spring rate (N/mm)
- 1.743-195.575 N/mm
- Maximum load (N)
- 78.41-16721.66 N
Matching Reference Configurations
| Model | Product | Wire / thickness | OD | ID | Free length | Rate (N/mm) | Material | Max load (N) |
|---|---|---|---|---|---|---|---|---|
| ST-400-0170-0256-0719 | Straight-Leg Torsion Springs | 4 mm | 16.99 mm | 8.99 mm | 25.63 mm | 164.644 | 304 Stainless Steel | 5038.1 |
| ST-400-0226-0156-0689 | Single-Leg Torsion Springs | 4 mm | 22.62 mm | 14.62 mm | 15.65 mm | 195.575 | 316 Stainless Steel | 16721.66 |
| ST-400-0248-0735-0653 | Straight-Leg Torsion Springs | 4 mm | 24.78 mm | 16.78 mm | 73.47 mm | 40.237 | Oil-Tempered Spring Wire (SWO) | 7097.89 |
| ST-400-0278-0183-0596 | Single-Leg Torsion Springs | 4 mm | 27.82 mm | 19.82 mm | 18.3 mm | 149.334 | Inconel X-750 | 5614.98 |
| SW-400-0280-0916-0776 | Torsion Bar Springs | 4 mm | 28.02 mm | 20.02 mm | 91.56 mm | 20.268 | Oil-Tempered Spring Wire (SWO) | 264.3 |
| ST-400-0294-0619-0709 | Single-Leg Torsion Springs | 4 mm | 29.41 mm | 21.41 mm | 61.94 mm | 38.502 | 60Si2MnA Spring Steel | 1986.7 |
| ST-400-0302-0618-0686 | Double-Leg Torsion Springs | 4 mm | 30.24 mm | 22.24 mm | 61.84 mm | 23.01 | Beryllium Copper (QBe2) | 1145.91 |
| ST-400-0315-0583-0668 | Straight-Leg Torsion Springs | 4 mm | 31.52 mm | 23.52 mm | 58.27 mm | 39.292 | Carbon Spring Steel Wire (SWC) | 4585.38 |
| 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-400-0450-0687-0626 | Single-Leg Torsion Springs | 4 mm | 45 mm | 37 mm | 68.68 mm | 21.131 | 65Mn Spring Steel | 1094.57 |
| ST-400-0456-0282-0649 | Straight-Leg Torsion Springs | 4 mm | 45.65 mm | 37.65 mm | 28.16 mm | 52.317 | Carbon Spring Steel Wire (SWC) | 6890.19 |
| ST-400-0521-0652-0675 | Double-Leg Torsion Springs | 4 mm | 52.12 mm | 44.12 mm | 65.16 mm | 19.925 | 65Mn Spring Steel | 3267.62 |
| ST-400-0531-0742-0711 | Single-Leg Torsion Springs | 4 mm | 53.11 mm | 45.11 mm | 74.19 mm | 10.641 | Beryllium Copper (QBe2) | 1439.72 |
| SW-400-0554-1090-0736 | Hairpin Springs | 4 mm | 55.36 mm | 47.36 mm | 109.04 mm | 6.791 | 304 Stainless Steel | 217.84 |
| SW-400-0598-1946-0790 | Torsion Bar Springs | 4 mm | 59.78 mm | 51.78 mm | 194.56 mm | 1.743 | 316 Stainless Steel | 78.41 |
Quotation Notes
For a final quote, send the target load or spring rate, working travel, material preference, operating temperature, environment, quantity and drawing. CustomSprings can adjust coil count, end type, free length, outside diameter and surface finish from these reference rows.
CustomSprings Engineering Catalog
Request This Spring
Send your dimensions, quantity and drawing for engineering review.
Frequently Asked Questions
Can the outside diameter change if the wire diameter stays fixed?
Yes. Outside diameter, coil count, free length and end type can be changed around the selected wire diameter if the stress, solid height and load target remain feasible.
Are the dimensions shown in millimeters or inches?
The catalog data is stored in millimeters. The summary also gives inch conversions for quick review by US customers.
What information is needed for a quote?
Send the wire diameter, OD or ID, free length, rate or load, working travel, material, environment, quantity and drawing.