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Compression Springs

Custom Variable-Diameter Compression Springs

A compression spring with a deliberately changing coil diameter used to fit non-uniform spaces, tune stability, or shape how the spring responds through its travel.

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Variable-Diameter Compression Springs manufactured by CustomSprings
Typical configurations
105
Wire diameter
0.2–12 mm
Outside diameter
2.33–138.71 mm
Free length
2.54–390.72 mm

About Custom Variable-Diameter Compression Springs

Variable-diameter compression springs are not limited to a simple cone. The coil diameter can widen, narrow or change in selected sections to suit the product envelope or to influence stability and coil engagement. This flexibility makes the assembly drawing especially important because the spring shape is usually tied to nearby features.

Key Design Characteristics

  • Diameter changes can be placed only where the surrounding assembly allows them.
  • Different sections may engage at different points in the stroke, changing the effective rate.
  • A larger support section can improve seating while a smaller section clears a narrow feature.
  • Coil-to-coil and coil-to-housing clearance should be checked over the full movement, not only in the free state.

What to Specify for a Custom Quote

  • Wire diameter and a sectioned diameter profile or 3D envelope
  • Free length, installed height and maximum compression
  • Load targets at the important working positions
  • Locations where coils may or may not contact each other
  • End geometry, orientation, cycles, material and environment

Manufacturing Review

A simple overall OD is not enough for this product. The manufacturing drawing should dimension the changing profile from clear datums so the coil path can be inspected consistently from sample to production.

Common Assembly Roles

  • Irregular spring pockets
  • Progressive or staged compression behavior
  • Assemblies needing different support diameters at each end

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.

ModelWire dia.ODIDFree lengthRateMaterialCoilsMax load
SC-150-0201-0187-0062 1.5 mm 20.07 mm 17.07 mm 18.68 mm 0.413 Phosphor Bronze (QSn4-0.3) 10.8 0.73
SC-150-0111-0341-0035 1.5 mm 11.07 mm 8.07 mm 34.09 mm 4.608 Carbon Spring Steel Wire (SWC) 14.3 40.87
SC-200-0116-0439-0143 2 mm 11.63 mm 7.63 mm 43.9 mm 10.584 301 Stainless Steel 15.6 83.19
SC-180-0154-0300-0278 1.8 mm 15.44 mm 11.84 mm 29.97 mm 4.881 Music Wire (SWP-A) 9.9 49.84
SC-1200-0959-3192-0230 12 mm 95.93 mm 71.93 mm 319.21 mm 14.405 304 Stainless Steel 22.5 535.72
SC-050-0023-0037-0328 0.5 mm 2.34 mm 1.34 mm 3.71 mm 26.222 316 Stainless Steel 4.8 27.01
SC-200-0248-0601-0210 2 mm 24.78 mm 20.78 mm 60.07 mm 0.711 Oil-Tempered Spring Wire (SWO) 20.8 9.58
SC-050-0053-0077-0397 0.5 mm 5.32 mm 4.32 mm 7.66 mm 0.458 304 Stainless Steel 12 0.58
SC-1200-0598-3907-0149 12 mm 59.85 mm 35.85 mm 390.72 mm 93.451 Inconel X-750 21.5 8491.94
SC-800-0912-0937-0419 8 mm 91.17 mm 75.17 mm 93.72 mm 13.02 60Si2MnA Spring Steel 7.4 260.79
SC-120-0095-0296-0147 1.2 mm 9.53 mm 7.13 mm 29.63 mm 1.281 Beryllium Copper (QBe2) 17.8 8.71
SC-700-1033-2821-0016 7 mm 103.26 mm 89.26 mm 282.08 mm 0.835 316 Stainless Steel 29.8 35.81
SC-150-0132-0256-0229 1.5 mm 13.22 mm 10.22 mm 25.56 mm 2.659 304 Stainless Steel 11.7 15.37
SC-020-0028-0025-0412 0.2 mm 2.76 mm 2.36 mm 2.54 mm 0.145 65Mn Spring Steel 8.5 0.07
SC-040-0050-0102-0180 0.4 mm 4.96 mm 4.16 mm 10.25 mm 0.084 Beryllium Copper (QBe2) 20.3 0.1
SC-250-0242-0374-0189 2.5 mm 24.23 mm 19.23 mm 37.39 mm 4.492 Music Wire (SWP-B) 9.4 34.82
SC-100-0120-0359-0010 1 mm 12 mm 10 mm 35.92 mm 0.269 Music Wire (SWP-A) 29.2 1.13
SC-1000-1083-0888-0065 10 mm 108.29 mm 88.29 mm 88.77 mm 14.89 304 Stainless Steel 7.1 147.56
SC-600-0667-1954-0154 6 mm 66.72 mm 54.72 mm 195.39 mm 1.572 Beryllium Copper (QBe2) 23.6 50.53
SC-600-0821-0715-0389 6 mm 82.09 mm 70.09 mm 71.53 mm 3.543 65Mn Spring Steel 9.2 39.75
SC-300-0152-0428-0335 3 mm 15.2 mm 9.2 mm 42.85 mm 36.296 316 Stainless Steel 12.1 163.33
SC-040-0062-0049-0129 0.4 mm 6.2 mm 5.4 mm 4.86 mm 0.162 304 Stainless Steel 8 0.19
SC-150-0079-0562-0110 1.5 mm 7.86 mm 4.86 mm 56.25 mm 8.097 Inconel X-750 25 121.45
SC-350-0331-0687-0026 3.5 mm 33.12 mm 26.12 mm 68.69 mm 4.148 Music Wire (SWP-A) 14.8 59.23
SC-300-0462-1054-0100 3 mm 46.2 mm 40.2 mm 105.43 mm 0.25 Phosphor Bronze (QSn4-0.3) 21.6 5.97
SC-050-0055-0063-0193 0.5 mm 5.46 mm 4.46 mm 6.33 mm 0.686 Music Wire (SWP-B) 9.4 0.93
SC-800-0865-0639-0071 8 mm 86.47 mm 70.47 mm 63.89 mm 22.113 Music Wire (SWP-A) 5.3 312.02
SC-200-0286-0284-0359 2 mm 28.6 mm 24.6 mm 28.44 mm 1.296 Music Wire (SWP-A) 8.5 11.91
SC-500-0313-0438-0187 5 mm 31.28 mm 21.28 mm 43.84 mm 68.01 Oil-Tempered Spring Wire (SWO) 6 542.72
SC-800-0969-1581-0319 8 mm 96.94 mm 80.94 mm 158.06 mm 3.953 Music Wire (SWP-B) 15.6 75.62
SC-350-0148-0997-0172 3.5 mm 14.77 mm 7.77 mm 99.74 mm 55.906 Carbon Spring Steel Wire (SWC) 19.4 1258.46
SC-080-0112-0278-0300 0.8 mm 11.2 mm 9.6 mm 27.85 mm 0.091 Beryllium Copper (QBe2) 25.4 0.5
SC-1200-0906-3280-0150 12 mm 90.61 mm 66.61 mm 328.05 mm 23.45 304 Stainless Steel 17.7 1972.89
SC-300-0409-0980-0218 3 mm 40.92 mm 34.92 mm 97.97 mm 0.594 65Mn Spring Steel 26.2 8.79
SC-400-0368-1102-0049 4 mm 36.79 mm 28.79 mm 110.2 mm 4.284 Music Wire (SWP-A) 18.8 95.24
SC-180-0223-0683-0236 1.8 mm 22.31 mm 18.71 mm 68.3 mm 0.482 Music Wire (SWP-B) 27 5.35
SC-120-0112-0095-0142 1.2 mm 11.22 mm 8.82 mm 9.5 mm 6.385 Music Wire (SWP-B) 4.7 19.22
SC-120-0144-0217-0356 1.2 mm 14.36 mm 11.96 mm 21.73 mm 0.668 Music Wire (SWP-A) 14.5 1.86
SC-030-0039-0056-0121 0.3 mm 3.91 mm 3.31 mm 5.6 mm 0.099 316 Stainless Steel 16 0.06
SC-050-0053-0072-0410 0.5 mm 5.29 mm 4.29 mm 7.18 mm 0.654 304 Stainless Steel 8.5 1.31
SC-080-0086-0355-0224 0.8 mm 8.55 mm 6.95 mm 35.46 mm 0.269 301 Stainless Steel 29.2 1.97
SC-150-0096-0248-0354 1.5 mm 9.6 mm 6.6 mm 24.82 mm 10.57 65Mn Spring Steel 10.4 67.43
SC-350-0409-0948-0222 3.5 mm 40.9 mm 33.9 mm 94.81 mm 1.8 Music Wire (SWP-B) 17.8 37.22
SC-030-0049-0034-0053 0.3 mm 4.87 mm 4.27 mm 3.4 mm 0.069 Phosphor Bronze (QSn4-0.3) 7.3 0.07
SC-200-0241-0799-0249 2 mm 24.07 mm 20.07 mm 79.93 mm 0.345 Beryllium Copper (QBe2) 26.9 5.47
SC-500-0686-1891-0386 5 mm 68.57 mm 58.57 mm 189.1 mm 0.823 Music Wire (SWP-A) 30.3 23.93
SC-350-0519-0255-0408 3.5 mm 51.93 mm 44.93 mm 25.46 mm 3.261 Oil-Tempered Spring Wire (SWO) 5 14.38
SC-050-0046-0140-0382 0.5 mm 4.58 mm 3.58 mm 14.03 mm 0.481 60Si2MnA Spring Steel 19.9 1.14
SC-020-0040-0037-0320 0.2 mm 3.98 mm 3.58 mm 3.68 mm 0.026 Inconel X-750 13.1 0.02
SC-1000-0910-2306-0391 10 mm 90.99 mm 70.99 mm 230.6 mm 10.276 316 Stainless Steel 17.8 433.12
SC-350-0289-1436-0134 3.5 mm 28.94 mm 21.94 mm 143.64 mm 3.863 65Mn Spring Steel 25.3 155.36
SC-020-0032-0079-0396 0.2 mm 3.25 mm 2.85 mm 7.87 mm 0.013 Beryllium Copper (QBe2) 27.3 0.02
SC-1200-1387-1108-0246 12 mm 138.71 mm 114.71 mm 110.78 mm 23.26 Carbon Spring Steel Wire (SWC) 5.8 752.68
SC-040-0037-0075-0146 0.4 mm 3.73 mm 2.93 mm 7.52 mm 0.281 Beryllium Copper (QBe2) 16.3 0.23
SC-050-0076-0138-0171 0.5 mm 7.6 mm 6.6 mm 13.82 mm 0.06 Beryllium Copper (QBe2) 19.5 0.19
SC-030-0024-0135-0360 0.3 mm 2.45 mm 1.85 mm 13.46 mm 0.176 Beryllium Copper (QBe2) 28.8 0.71
SC-030-0036-0045-0244 0.3 mm 3.65 mm 3.05 mm 4.46 mm 0.229 Inconel X-750 11.3 0.18
SC-800-0976-1769-0120 8 mm 97.63 mm 81.63 mm 176.86 mm 2.053 Phosphor Bronze (QSn4-0.3) 15.2 94.36
SC-200-0228-0332-0402 2 mm 22.84 mm 18.84 mm 33.15 mm 1.694 301 Stainless Steel 10.5 13.37
SC-040-0042-0183-0115 0.4 mm 4.15 mm 3.35 mm 18.34 mm 0.182 Carbon Spring Steel Wire (SWC) 28.2 1.08
SC-020-0038-0074-0032 0.2 mm 3.81 mm 3.41 mm 7.4 mm 0.007 Beryllium Copper (QBe2) 30.9 0.01
SC-150-0171-0608-0136 1.5 mm 17.09 mm 14.09 mm 60.77 mm 0.511 Inconel X-750 27.8 6.99
SC-400-0299-1468-0027 4 mm 29.94 mm 21.94 mm 146.77 mm 6.34 Carbon Spring Steel Wire (SWC) 24.7 181.39
SC-040-0037-0121-0344 0.4 mm 3.67 mm 2.87 mm 12.11 mm 0.286 Inconel X-750 27.3 0.27
SC-060-0047-0123-0365 0.6 mm 4.74 mm 3.54 mm 12.28 mm 1.46 Music Wire (SWP-A) 13.9 4.83
SC-1000-1382-0954-0371 10 mm 138.19 mm 118.19 mm 95.43 mm 8.256 Music Wire (SWP-B) 6.7 168.08
SC-150-0078-0333-0165 1.5 mm 7.82 mm 4.82 mm 33.32 mm 15.234 Oil-Tempered Spring Wire (SWO) 14 151.12
SC-180-0109-0366-0255 1.8 mm 10.88 mm 7.28 mm 36.62 mm 5.403 Phosphor Bronze (QSn4-0.3) 14.3 48.96
SC-350-0189-0359-0085 3.5 mm 18.87 mm 11.87 mm 35.9 mm 58.524 Music Wire (SWP-A) 8.5 215.95
SC-350-0398-0658-0341 3.5 mm 39.77 mm 32.77 mm 65.8 mm 2.489 301 Stainless Steel 12.4 42.95
SC-400-0561-1671-0179 4 mm 56.14 mm 48.14 mm 167.09 mm 0.609 Oil-Tempered Spring Wire (SWO) 30.8 22.1
SC-030-0055-0130-0385 0.3 mm 5.5 mm 4.9 mm 12.99 mm 0.018 316 Stainless Steel 28.2 0.05
SC-120-0155-0153-0104 1.2 mm 15.53 mm 13.13 mm 15.34 mm 1.221 Oil-Tempered Spring Wire (SWO) 7.7 5.09
SC-060-0074-0101-0208 0.6 mm 7.43 mm 6.23 mm 10.11 mm 0.295 316 Stainless Steel 13.9 0.44
SC-040-0042-0090-0373 0.4 mm 4.22 mm 3.42 mm 9.01 mm 0.236 60Si2MnA Spring Steel 20.2 0.13
SC-120-0093-0380-0265 1.2 mm 9.33 mm 6.93 mm 37.99 mm 1.233 304 Stainless Steel 28.5 2.67
SC-250-0174-0659-0276 2.5 mm 17.41 mm 12.41 mm 65.88 mm 5.848 Inconel X-750 21.9 37.9
SC-400-0513-0536-0127 4 mm 51.26 mm 43.26 mm 53.61 mm 4.075 Music Wire (SWP-B) 7.9 50.48
SC-200-0236-0526-0103 2 mm 23.56 mm 19.56 mm 52.58 mm 0.973 65Mn Spring Steel 18.2 9.77
SC-180-0164-0322-0019 1.8 mm 16.44 mm 12.84 mm 32.15 mm 1.309 Phosphor Bronze (QSn4-0.3) 15.1 4.02
SC-020-0038-0077-0312 0.2 mm 3.84 mm 3.44 mm 7.71 mm 0.011 Carbon Spring Steel Wire (SWC) 30.9 0.01
SC-060-0081-0122-0012 0.6 mm 8.13 mm 6.93 mm 12.24 mm 0.182 301 Stainless Steel 15.4 0.46
SC-1200-1034-1032-0145 12 mm 103.37 mm 79.37 mm 103.23 mm 74.851 Music Wire (SWP-A) 5.1 2313.63
SC-500-0303-1412-0299 5 mm 30.33 mm 20.33 mm 141.17 mm 13.538 304 Stainless Steel 25.5 114.26
SC-200-0281-0279-0009 2 mm 28.09 mm 24.09 mm 27.92 mm 0.845 316 Stainless Steel 10.2 3.62
SC-150-0196-0494-0256 1.5 mm 19.57 mm 16.57 mm 49.4 mm 0.195 Phosphor Bronze (QSn4-0.3) 24.5 1.9
SC-800-0633-1966-0209 8 mm 63.26 mm 47.26 mm 196.55 mm 13.776 Inconel X-750 19.4 452.67
SC-150-0128-0563-0043 1.5 mm 12.81 mm 9.81 mm 56.26 mm 1.417 316 Stainless Steel 23.3 17.66
SC-250-0238-1083-0046 2.5 mm 23.76 mm 18.76 mm 108.26 mm 1.257 316 Stainless Steel 29.9 24.73
SC-1000-1235-1786-0086 10 mm 123.52 mm 103.52 mm 178.6 mm 3.244 Phosphor Bronze (QSn4-0.3) 11.8 149.38
SC-060-0090-0069-0226 0.6 mm 8.95 mm 7.75 mm 6.89 mm 0.234 316 Stainless Steel 9.2 0.22
SC-020-0023-0056-0183 0.2 mm 2.33 mm 1.93 mm 5.65 mm 0.068 Music Wire (SWP-A) 25.1 0.03
SC-700-0913-1872-0333 7 mm 91.27 mm 77.27 mm 187.24 mm 1.672 316 Stainless Steel 21.7 48.73
SC-700-0943-2579-0013 7 mm 94.3 mm 80.3 mm 257.9 mm 0.962 Beryllium Copper (QBe2) 24.5 64.9
SC-600-0519-1702-0191 6 mm 51.93 mm 39.93 mm 170.19 mm 6.236 316 Stainless Steel 19.5 227.18
SC-800-0549-2405-0030 8 mm 54.86 mm 38.86 mm 240.52 mm 19.827 Carbon Spring Steel Wire (SWC) 21.2 993.95
SC-180-0145-0387-0181 1.8 mm 14.47 mm 10.87 mm 38.73 mm 1.824 Phosphor Bronze (QSn4-0.3) 16.5 9.27
SC-080-0043-0094-0261 0.8 mm 4.33 mm 2.73 mm 9.38 mm 13.136 Inconel X-750 8 31.13
SC-030-0024-0054-0036 0.3 mm 2.35 mm 1.75 mm 5.38 mm 0.772 316 Stainless Steel 11.5 1.1
SC-100-0101-0152-0310 1 mm 10.09 mm 8.09 mm 15.25 mm 1.229 Inconel X-750 12.7 2.52
SC-080-0092-0190-0048 0.8 mm 9.22 mm 7.62 mm 18.96 mm 0.332 304 Stainless Steel 18.8 0.88
SC-080-0072-0101-0375 0.8 mm 7.23 mm 5.63 mm 10.1 mm 1.661 304 Stainless Steel 9 3.02
SC-040-0035-0031-0138 0.4 mm 3.49 mm 2.69 mm 3.11 mm 1.37 Beryllium Copper (QBe2) 5.8 0.73
SC-700-1026-0928-0076 7 mm 102.6 mm 88.6 mm 92.83 mm 1.718 Phosphor Bronze (QSn4-0.3) 10.2 26.76
SC-500-0503-0549-0186 5 mm 50.3 mm 40.3 mm 54.87 mm 10.709 Oil-Tempered Spring Wire (SWO) 7.7 148.85

Rate: N/mm; maximum load: N. Dimensions are in millimeters.

Engineering Data

Typical Dimensions & Design Data

Use these data points to compare geometry, material and working parameters when defining your custom spring. Final values are reviewed and confirmed for the actual assembly before production.

ConfigurationData typeKey parametersMaterial / basis
Engineering reference Engineering Data
  • Construction type: Variable-Diameter Compression Spring
  • Use / availability status: Custom / made-to-order
 Per application / drawing
Engineering Data 02 Manufacturing Range
  • Round-wire Wire diameter minimum: 0.038 mm
  • Round-wire Wire diameter maximum: 15.875 mm
  • Reference parameter: 50.8 mm
 Common spring steels, stainless steels and alloys
Engineering Data 03 Manufacturing Range
  • Section shape: Round / square / rectangular / special section
  • Data use: Feasibility / RFQ
 Per drawing

Design note: dimensions, force / torque, material, tolerances, fatigue life and compliance are finalized against your drawing and operating conditions during quotation.

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.

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 →

Materials

Choose the material for the environment

Material choice follows load, life and environment, while the variable geometry adds a formability constraint. Tight bends or abrupt diameter changes may favor materials and tempers that can be formed without surface damage.

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.

Carbon & Alloy Spring SteelsSelection guide Stainless Steel Spring MaterialsSelection guide Copper Alloy Spring MaterialsSelection guide Nickel & High-Temperature Spring AlloysSelection guide

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 Compression Springs Engineering Data 14 matching variable-diameter compression springs data rows are included in the category. Material data Music Wire (SWP-A) Compression Springs Engineering Data 12 matching variable-diameter compression springs data rows are included in the category. Material data Beryllium Copper (QBe2) Compression Springs Engineering Data 12 matching variable-diameter compression springs data rows are included in the category. Wire diameter 0.2 mm Compression Springs Engineering Data 6 matching variable-diameter compression springs data rows are included in the category. Wire diameter 1.2 mm Compression Springs Engineering Data 5 matching variable-diameter compression springs data rows are included in the category. Wire diameter 3.5 mm Compression Springs Engineering Data 7 matching variable-diameter compression springs data rows are included in the category.

Compare Designs

Use these alternatives when the available space, connection style, travel or force direction changes.

Conical Compression Springs manufactured by CustomSprings

Compression Springs

Conical Compression Springs

A tapered compression spring for assemblies that need a changing diameter, improved stability, or a lower compressed package than a conventional straight coil can provide.

Tower-Shaped Compression Springs manufactured by CustomSprings

Compression Springs

Tower-Shaped Compression Springs

A stepped or strongly tapered compression spring built for compact collapse, nested coils, and assemblies where the available diameter changes along the spring height.

Cylindrical Compression Springs manufactured by CustomSprings

Compression Springs

Cylindrical Compression Springs

A straight, constant-diameter coil for predictable axial force where the spring works inside a bore, around a guide, or between two flat seats.

Product Questions

Variable-Diameter Compression Springs FAQ

Can a variable-diameter spring be used to create a progressive feel?

It can. If selected coils begin to contact or the active geometry changes during travel, the force curve can become progressive. The target load curve should be specified explicitly.

Is a 3D model necessary?

Not always, but it is very helpful when the diameter profile follows a complex housing or when several local clearances must be protected.

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

Request This Spring

Send your dimensions, quantity and drawing for engineering review.

Request a Custom Quote

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Spring Requirements
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