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
Piano Wire Round Wire Coil Springs - 40% Deflection, WL Series | Fast Fulfillment | MISUMI
Round Wire Coil Springs (Piano Wire) from the WL Series deliver 40% allowable deflection for stable force curves. Choose loads & sizing options.
WR Series Round Wire Coil Springs 60% Deflection | Select Spring Constant Options | MISUMI
WR Series Round Wire Coil Springs 60% Deflection for controlled force under load. Choose spring constant options and compatible sizes. Request a quote.
WM Series Round Wire Coil Springs 35% Deflection | Piano Wire Durability | MISUMI
WM Series Round Wire Coil Springs made from piano wire deliver reliable tension and compression with up to 35% deflection. Request a quote.
Round Wire Coil Springs - 45% Deflection WF Series | Piano Wire Springs | MISUMI
Round Wire Coil Springs - 45% Deflection WF Series with piano wire design deliver controlled spring response for reliable assembly. Request a quote.
WT Series Round Wire Coil Springs 40% Deflection | Piano Wire High Strength | MISUMI
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.
WH Series Round Wire Coil Springs - 30% Deflection | Precise Shock Support | MISUMI
WH Series Round Wire Coil Springs - 30% Deflection provide controlled load capacity and stable shock absorption for mechanical systems. Request a quote.
WY Series Round Wire Coil Springs - 75% Deflection | Fast Assembly Support | MISUMI
Round Wire Coil Springs - 75% Deflection, WY Series for controlled spring response in assemblies. Type WY allows flexible constant selection; request a quote.
Round Wire Coil Springs - 25% Deflection WB Series | Industrial Springs | MISUMI
Round Wire Coil Springs - 25% Deflection WB Series for reliable load control in industrial assemblies. Select spring constant and max load. Request a quote.
Round Wire Springs - Plain Ends, 10 in Length Carbon Steel | Lamina | Lamina
Round Wire Springs - Plain Ends, 10 in Length Carbon Steel by Lamina for vibration control and resilient support in industrial machinery. Request a quote.
Compression Springs Inch, O.D. and Length Selectable | Lamina Round Wire Springs | Lamina
Compression Springs Inch, O.D. and Length Selectable from Lamina for reliable, axis-load compression. Choose outer diameter, length, and end type to Request a Quote.
Extension Spring - Inch, O.D. and Length Selectable | Lamina | Reliable Tension Support | Lamina
Extension Spring - Inch, O.D. and Length Selectable by Lamina for dependable tension support in industrial equipment and mechanisms. Request a quote.
Round Wire Coil Springs - Inner Diameter Selection Type | Reliable Load Support | MISUMI
Round Wire Coil Springs - Inner Diameter Selection Type for controlled flexibility and stable tension. Select allowable deflection and maximum load. Reliable performance.
Utility Round Wire Springs Compression/Extension/Midget | Lamina | Reliable Tension & Support | Lamina
Utility Round Wire Springs (Compression/Extension/Midget) by Lamina deliver reliable tension and compression for industrial support, vibration control, and stable operation. Request a quote.
Deflection Rate Selection Guide
Deflection rate is the primary selection criterion for round wire springs. Lower deflection = stiffer spring, higher load capacity.
| Criteria | 25% (WB) | 35% (WM) | 45% (WF) | 60% (WR) | 75% (WY) |
|---|---|---|---|---|---|
| Stiffness | Stiffest | Firm | Medium | Soft | Softest |
| Load capacity | Highest | High | Medium | Low | Lowest |
| Fatigue life | Longest | Long | Medium | Shorter | Shortest |
| Best for | Heavy cushion, high-cycle | Standard duty | General purpose | Buffer, light cushion | Max 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.
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.
Frequently Asked Questions
Engineering Resources
How to Choose the Right Deflection Rate for Round Wire Springs
Deflection rate to application mapping with fatigue life considerations.
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?+
What is the difference between MISUMI WY/WR/WF/WL/WM/WH/WB series codes?+
Can I use round wire compression springs instead of die springs for stripping?+
Are extension springs available in this category, and how do they differ from compression springs?+
Engineering Resources
How to Choose the Right Deflection Rate for Round Wire Springs
Deflection rate to application mapping with fatigue life considerations.
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.