Applications
Where this spring style fits
Review best-fit uses, assembly constraints and situations where another spring style may be a better choice.
View application guidance →Extension Springs
Custom Offset-Hook Extension Springs
An extension spring with an intentionally offset connection point for assemblies where the anchors do not line up with the coil centerline.
- Typical configurations
- 26
- Wire diameter
- 0.15–5 mm
- Outside diameter
- 1.89–57.84 mm
- Free length
- 6.67–253.74 mm
About Custom Offset-Hook Extension Springs
Offset-hook extension springs solve a packaging problem at the end connection rather than in the coil body. By moving the hook contact point to one side, the spring can clear neighboring parts or reach an anchor that cannot be relocated. The offset must be deliberate and dimensioned; it should not be used to hide uncontrolled misalignment.
Key Design Characteristics
- Offset distance and hook plane determine how the pull line enters the spring body.
- Changing pull direction through the stroke can add bending or twisting to the end.
- Initial tension and body rate should still be specified independently of the offset geometry.
- Clearance around the offset hook should be checked at both minimum and maximum extension.
What to Specify for a Custom Quote
- Wire diameter, body OD and body length
- Offset distance from coil centerline and hook geometry
- Free, installed and maximum working lengths
- Initial tension and loads at defined positions
- Anchor coordinates, motion path, cycles, material and finish
Manufacturing Review
The offset should be inspected from a defined datum rather than by visual comparison. For complex end forms, a 2D drawing with two orthogonal views is usually more reliable than an overall envelope alone.
Common Assembly Roles
- Side-mounted latch anchors
- Routing around adjacent components
- Legacy assemblies with fixed, non-coaxial mounting points
Product Data
Typical Spring Configurations
Use these data points to compare practical starting dimensions and material options. Final production specifications are confirmed against your drawing and working conditions.
| Model | Wire dia. | OD | ID | Free length | Rate | Material | Coils | Max load |
|---|---|---|---|---|---|---|---|---|
| SE-200-0093-1378-0587 | 2 mm | 9.28 mm | 5.28 mm | 137.77 mm | 6.986 | 316 Stainless Steel | 51.2 | 232.17 |
| SE-030-0026-0076-0452 | 0.3 mm | 2.65 mm | 2.05 mm | 7.59 mm | 0.367 | Carbon Spring Steel Wire (SWC) | 16.7 | 1.15 |
| SE-040-0030-0225-0554 | 0.4 mm | 2.96 mm | 2.16 mm | 22.49 mm | 0.372 | Music Wire (SWP-B) | 40.7 | 3.01 |
| SE-100-0112-0246-0515 | 1 mm | 11.2 mm | 9.2 mm | 24.65 mm | 0.367 | Beryllium Copper (QBe2) | 15.4 | 2.39 |
| SE-060-0060-0376-0436 | 0.6 mm | 5.98 mm | 4.78 mm | 37.62 mm | 0.165 | 60Si2MnA Spring Steel | 49.8 | 1.68 |
| SE-060-0035-0410-0511 | 0.6 mm | 3.53 mm | 2.33 mm | 41.05 mm | 0.85 | 316 Stainless Steel | 52.3 | 12.05 |
| SE-080-0044-0408-0472 | 0.8 mm | 4.4 mm | 2.8 mm | 40.76 mm | 2.275 | 60Si2MnA Spring Steel | 38.1 | 15.79 |
| SE-050-0062-0355-0427 | 0.5 mm | 6.19 mm | 5.19 mm | 35.54 mm | 0.056 | 65Mn Spring Steel | 59.3 | 0.5 |
| SE-300-0256-1058-0448 | 3 mm | 25.64 mm | 19.64 mm | 105.78 mm | 2.859 | Music Wire (SWP-B) | 24.2 | 80.7 |
| SE-060-0062-0299-0488 | 0.6 mm | 6.17 mm | 4.97 mm | 29.94 mm | 0.181 | Music Wire (SWP-A) | 41 | 1.52 |
| SE-250-0297-0904-0450 | 2.5 mm | 29.74 mm | 24.74 mm | 90.41 mm | 0.443 | Beryllium Copper (QBe2) | 26.2 | 10.45 |
| SE-040-0022-0090-0541 | 0.4 mm | 2.25 mm | 1.45 mm | 9.01 mm | 2.768 | 316 Stainless Steel | 12.6 | 6.12 |
| SE-120-0057-0538-0574 | 1.2 mm | 5.66 mm | 3.26 mm | 53.79 mm | 7.124 | 65Mn Spring Steel | 32.4 | 91.85 |
| SE-020-0020-0138-0455 | 0.2 mm | 2.03 mm | 1.63 mm | 13.77 mm | 0.046 | 60Si2MnA Spring Steel | 56 | 0.19 |
| SE-080-0050-0577-0565 | 0.8 mm | 5.01 mm | 3.41 mm | 57.74 mm | 0.916 | Inconel X-750 | 59.2 | 10.58 |
| SE-180-0157-0920-0426 | 1.8 mm | 15.71 mm | 12.11 mm | 92.01 mm | 0.863 | 301 Stainless Steel | 39 | 20.02 |
| SE-040-0049-0206-0440 | 0.4 mm | 4.88 mm | 4.08 mm | 20.56 mm | 0.075 | Carbon Spring Steel Wire (SWC) | 37.1 | 0.49 |
| SE-400-0432-2233-0569 | 4 mm | 43.23 mm | 35.23 mm | 223.32 mm | 0.937 | 60Si2MnA Spring Steel | 44.7 | 46.74 |
| SE-015-0021-0067-0563 | 0.15 mm | 2.06 mm | 1.76 mm | 6.67 mm | 0.014 | Beryllium Copper (QBe2) | 31.2 | 0.04 |
| SE-150-0103-0729-0491 | 1.5 mm | 10.26 mm | 7.26 mm | 72.94 mm | 1.956 | 304 Stainless Steel | 33.2 | 35.06 |
| SE-040-0032-0227-0577 | 0.4 mm | 3.2 mm | 2.4 mm | 22.67 mm | 0.274 | Inconel X-750 | 42 | 1.78 |
| SE-180-0130-0915-0422 | 1.8 mm | 13 mm | 9.4 mm | 91.48 mm | 1.882 | Oil-Tempered Spring Wire (SWO) | 39.2 | 32.63 |
| SE-015-0019-0080-0530 | 0.15 mm | 1.89 mm | 1.59 mm | 8.04 mm | 0.021 | 316 Stainless Steel | 39.1 | 0.06 |
| SE-400-0315-1736-0435 | 4 mm | 31.52 mm | 23.52 mm | 173.61 mm | 1.925 | Phosphor Bronze (QSn4-0.3) | 32.7 | 62.69 |
| SE-030-0024-0116-0555 | 0.3 mm | 2.4 mm | 1.8 mm | 11.57 mm | 0.286 | Oil-Tempered Spring Wire (SWO) | 30.2 | 1.01 |
| SE-500-0578-2537-0585 | 5 mm | 57.84 mm | 47.84 mm | 253.74 mm | 0.536 | Phosphor Bronze (QSn4-0.3) | 40.5 | 37.77 |
Rate: N/mm; maximum load: N. Dimensions are in millimeters.
Next Design Decisions
Next Steps for Your Spring Design
Once the spring style is selected, confirm how it works in the assembly, which material suits the environment, how it will be manufactured and which dimensions and performance points should be controlled on the drawing.
Materials
Choose the material for the environment
The end form can see combined bending and tension, so material and temper should support the required hook shape without cracking or excessive springback.
Compare spring materials →Manufacturing
Plan prototype and production
Review forming, heat treatment, secondary operations, inspection and the path from first samples to repeat production.
View manufacturing capabilities →Engineering Data
Open matching engineering guides
Matching material and wire-diameter pages provide additional design data for material and size selection.
Open Spring Engineering Guide →Material Direction
Common Material Families to Review
The links below are selection guides, not a claim that every grade is suitable for every size or load.
Related Spring Design Guides
Review the design and measurement requirements for this spring family.
Engineering Support
Spring Engineering Guides
Use these guides to compare material, wire diameter and standard requirements before finalizing the product drawing.
Material data
316 Stainless Steel Extension Springs Engineering Data
4 matching offset-hook extension springs data rows are included in the category.
Material data
60Si2MnA Spring Steel Extension Springs Engineering Data
4 matching offset-hook extension springs data rows are included in the category.
Material data
Beryllium Copper (QBe2) Extension Springs Engineering Data
3 matching offset-hook extension springs data rows are included in the category.
Wire diameter
0.15 mm Extension Springs Engineering Data
2 matching offset-hook extension springs data rows are included in the category.
Wire diameter
0.6 mm Extension Springs Engineering Data
3 matching offset-hook extension springs data rows are included in the category.
Wire diameter
1.8 mm Extension Springs Engineering Data
2 matching offset-hook extension springs data rows are included in the category.
Compare Designs
Related Spring Products
Use these alternatives when the available space, connection style, travel or force direction changes.
Extension Springs
Round-Hook Extension Springs
An extension spring with simple round hooks for straightforward pin, hole or tab connections where the pull direction stays close to the spring axis.
Extension Springs
German-Hook Extension Springs
An extension spring with a compact German-style hook profile used when the connection geometry needs more control than a simple round loop provides.
Extension Springs
English-Hook Extension Springs
A compact end-hook extension spring suited to small linkages and constrained connections where the attachment needs to stay close to the coil body.
Product Questions
Offset-Hook Extension Springs FAQ
Can an offset hook compensate for assembly variation?
It should compensate for a known, dimensioned offset. If anchor position varies randomly, the spring may see inconsistent side loading and the connection should be redesigned.
Does the offset change the nominal spring rate?
The body rate may remain similar, but the force direction at the hook can change the effective behavior seen by the mechanism. The installed geometry matters.
RFQ
Send the Working Requirement
A drawing is ideal. If you do not have one yet, provide the dimensions, load or torque, travel, environment and expected quantity that matter in the assembly.
CustomSprings Engineering Catalog
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