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Round Wire Springs

General-purpose compression and extension springs with 25%–75% deflection range. Circular wire cross-section for light-to-moderate cushioning, guide returns, and buffer applications in press dies.

Products in This Category

Round Wire Coil Springs - 75% Deflection, WY Series

Round Wire Coil Springs - 75% Deflection, WY Series

Round Wire Coil Springs - 75% Deflection, WY Series for controlled spring response in assemblies. Type WY allows flexible constant selection; request a quote.

View DetailsWR Series Round Wire Coil Springs 60% Deflection

WR Series Round Wire Coil Springs 60% Deflection

WR Series Round Wire Coil Springs 60% Deflection for controlled force under load. Choose spring constant options and compatible sizes. Request a quote.

View DetailsRound Wire Coil Springs - 45% Deflection WF Series

Round Wire Coil Springs - 45% Deflection WF Series

Round Wire Coil Springs - 45% Deflection WF Series with piano wire design deliver controlled spring response for reliable assembly. Request a quote.

View DetailsPiano Wire Round Wire Coil Springs - 40% Deflection, WL Series

Piano Wire Round Wire Coil Springs - 40% Deflection, WL Series

Round Wire Coil Springs (Piano Wire) from the WL Series deliver 40% allowable deflection for stable force curves. Choose loads & sizing options.

View DetailsWT Series Round Wire Coil Springs 40% Deflection

WT Series Round Wire Coil Springs 40% Deflection

WT Series Round Wire Coil Springs 40% deflection made from piano wire for reliable shock absorption and load support. Choose deflection 40%. Request a quote.

View DetailsWM Series Round Wire Coil Springs 35% Deflection

WM Series Round Wire Coil Springs 35% Deflection

WM Series Round Wire Coil Springs made from piano wire deliver reliable tension and compression with up to 35% deflection. Request a quote.

View DetailsWH Series Round Wire Coil Springs - 30% Deflection

WH Series Round Wire Coil Springs - 30% Deflection

WH Series Round Wire Coil Springs - 30% Deflection provide controlled load capacity and stable shock absorption for mechanical systems. Request a quote.

View DetailsRound Wire Coil Springs - 25% Deflection WB Series

Round Wire Coil Springs - 25% Deflection WB Series

Round Wire Coil Springs - 25% Deflection WB Series for reliable load control in industrial assemblies. Select spring constant and max load. Request a quote.

View DetailsRound Wire Coil Springs - Inner Diameter Selection Type

Round Wire Coil Springs - Inner Diameter Selection Type

Round Wire Coil Springs - Inner Diameter Selection Type for controlled flexibility and stable tension. Select allowable deflection and maximum load. Reliable...

View DetailsRound Wire Springs - Plain Ends, 10 in Length Carbon Steel

Round Wire Springs - Plain Ends, 10 in Length Carbon Steel

Round Wire Springs - Plain Ends, 10 in Length Carbon Steel by Lamina for vibration control and resilient support in industrial machinery. Request a quote.

View DetailsUtility Round Wire Springs (Compression/Extension/Midget)

Utility Round Wire Springs (Compression/Extension/Midget)

Utility Round Wire Springs (Compression/Extension/Midget) by Lamina deliver reliable tension and compression for industrial support, vibration control, and s...

View DetailsCompression Springs Inch, O.D. and Length Selectable

Compression Springs Inch, O.D. and Length Selectable

Compression Springs Inch, O.D. and Length Selectable from Lamina for reliable, axis-load compression. Choose outer diameter, length, and end type to Request ...

View DetailsExtension Spring - Inch, O.D. and Length Selectable

Extension Spring - Inch, O.D. and Length Selectable

Extension Spring - Inch, O.D. and Length Selectable by Lamina for dependable tension support in industrial equipment and mechanisms. Request a quote.

View Details

Deflection Rate Selection Guide

Deflection rate is the primary selection criterion for round wire springs. Lower deflection = stiffer spring, higher load capacity.

Criteria25% (WB)35% (WM)45% (WF)60% (WR)75% (WY)
StiffnessStiffestFirmMediumSoftSoftest
Load capacityHighestHighMediumLowLowest
Fatigue lifeLongestLongMediumShorterShortest
Best forHeavy cushion, high-cycleStandard dutyGeneral purposeBuffer, light cushionMax travel cushion

Selection rule: Start with 35-45% deflection for general die applications. Drop to 25-30% for heavy loads or maximum fatigue life. Increase to 60-75% only when maximum travel is needed with minimal force. For a complete selection guide, see our How to Choose the Right Deflection Rate for Round Wire Springs.

Round Wire Springs or Die Springs?

✅ You're in the right place if:

  • You need compression or extension springs for cushioning, guide returns, or light stripping
  • Deflection requirements exceed 25% of free length
  • Force requirements are moderate (not heavy die stripping)
  • You need extension (pulling) springs — die springs are compression only

🔄 Consider switching to:

  • Die Springs — for heavy stripping, blanking, or pressure pad applications requiring ISO 10243 standardized load classes
  • Urethane Springs — for higher load density in compact spaces with zero fragmentation risk

About Round Wire Springs

Round wire springs use circular cross-section wire for general-purpose compression and extension applications in press dies. Our range includes MISUMI's 9-series deflection lineup (WY through WB, covering 25-75%) plus Lamina inch-standard compression and extension springs with selectable OD and length. These springs complement die springs for applications where high deflection and moderate force are needed.

Application Scenarios

🔄

Strip Guide Return Mechanisms

Progressive die strip guides need gentle, repeatable return force to lift the strip between stations without deforming delicate features.

Why round wire springs fit: 60-75% deflection rates provide soft return force with maximum travel distance, preventing strip damage while ensuring reliable guide plate return.

Recommended:WR Series (60%) or WY Series (75%) for maximum travel with gentle force
🛡️

Shock Absorption & Buffer Stops

End-of-stroke buffers and shock absorbers need high energy absorption to protect die components from impact damage.

Why round wire springs fit: Higher deflection rates (45-60%) absorb more energy per cycle. Round wire springs are more tolerant of misalignment than die springs in buffer applications.

Recommended:WF Series (45%) or WR Series (60%) depending on available space

Frequently Asked Questions

Lower deflection (25-30%) = higher load capacity and longer fatigue life — use for heavy-duty cushioning with minimal travel. Higher deflection (60-75%) = softer response with more travel — use for buffers and light cushioning. 35-45% is the general-purpose sweet spot for most press die applications.
Each letter maps to a deflection rate: WY=75%, WR=60%, WF=45%, WL=40%, WT=40% (alternate spec), WM=35%, WH=30%, WB=25%. Higher percentage = more compressible, lower force per unit of compression. Lower percentage = stiffer, higher force.
Only for light stripping applications requiring less than approximately 50N of force. For standard and heavy stripping operations, die springs are required — their rectangular wire cross-section delivers 30-50% more force per unit volume compared to round wire springs of the same outer diameter.
Yes — Lamina offers inch-standard extension springs with selectable OD and length. Extension springs generate pulling force (tension) with hook ends, while compression springs generate pushing force. Extension springs are used for strip return mechanisms, part ejection assists, and guide plate return in progressive dies.

Engineering Resources

Selection Guide

How to Choose the Right Deflection Rate for Round Wire Springs

Deflection rate to application mapping with fatigue life considerations.

Boundary Guide

Do You Need Die Springs or Round Wire Springs for Your Stamping Die?

Decision framework for choosing between round wire and rectangular wire spring types.

Frequently Asked Questions

How do I select the right deflection rate (25%–75%) for round wire springs?+
Lower deflection (25-30%) = higher load capacity and longer fatigue life — use for heavy-duty cushioning with minimal travel. Higher deflection (60-75%) = softer response with more travel — use for buffers and light cushioning. 35-45% is the general-purpose sweet spot for most press die applications.
What is the difference between MISUMI WY/WR/WF/WL/WM/WH/WB series codes?+
Each letter maps to a deflection rate: WY=75%, WR=60%, WF=45%, WL=40%, WT=40% (alternate spec), WM=35%, WH=30%, WB=25%. Higher percentage = more compressible, lower force per unit of compression. Lower percentage = stiffer, higher force.
Can I use round wire compression springs instead of die springs for stripping?+
Only for light stripping applications requiring less than approximately 50N of force. For standard and heavy stripping operations, die springs are required — their rectangular wire cross-section delivers 30-50% more force per unit volume compared to round wire springs of the same outer diameter.
Are extension springs available in this category, and how do they differ from compression springs?+
Yes — Lamina offers inch-standard extension springs with selectable OD and length. Extension springs generate pulling force (tension) with hook ends, while compression springs generate pushing force. Extension springs are used for strip return mechanisms, part ejection assists, and guide plate return in progressive dies.

Engineering Resources

Selection Guide

How to Choose the Right Deflection Rate for Round Wire Springs

Deflection rate to application mapping with fatigue life considerations.

Boundary Guide

Do You Need Die Springs or Round Wire Springs for Your Stamping Die?

Decision framework for choosing between round wire and rectangular wire spring types.

Need a Custom Quote?

Specify your deflection rate, outer diameter, free length, and spring type (compression or extension). Inner diameter selection also available for MISUMI series.

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✓ MOQ 1 piece✓ 7 deflection rates available✓ Compression & extension types