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TORSION SPRINGS
- Wide Range In Spring Wire Diameter, Supporting Ultra-precise Fabrication Down to 0.05mm.
- Up to 50 mm Bar Stock
- Custom Torsion Spring End Options to Meet Your Needs
- Round, Rectangular, Square & Special-Section Wire
Torsion Spring Manufacturing Specifications
SNM Hardware provides completely customized production on all torsion springs.
- Large Volume Orders, Short Runs & Prototypes – formed, assembled and packaged to meet your requirements
- The probe inspection system for Superior Quality – ensures precision detection of dimensions, automatically isolating non-conforming products
- Tech Centers-you can work with our team and equipment to optimize designs and lower costs.
- Engineering Support – our team can provide expert design assistance on any order, or view our online spring design resources.
Shapes & Sizes
- wide range in Wire Diameter from 0.05mm
- Up to 50 mm Bar Stock
- Round Wire
- Square Wire
- Rectangular Wire
- Special Section Wire
End Types
- Bent
- Hooked
- Twisted
- Looped to Suit Your Project Needs and Order Specification
Common Materials
- Spring Steel
- High/Low Carbon Steel
- Nickel Plated Carbon Steel
- Stainless Alloys
- Non-Ferrous Metals
- Elgiloy®
- Hastelloy®
- Monel®
- Inconel®
- Titanium and more
Design of Torsion Springs
Critical design variables encompass free/installed height tolerance, operational deflection range, bore-shaft clearance specifications, static/dynamic load parameters, environmental exposure factors (temperature, corrosion, vibration), and fatigue life validation via FEA simulation. SNM’s engineering team conducts rigorous DFM analysis, optimizing wire diameter selection, active coil configuration, and stress distribution patterns.We implement material certification and performance testing protocols in accordance with international standards to provide cost-optimized spring solutions.
Torsion Springs Parameters
Hook Ends Types
Basic Design Formulas for Torsion Springs
Key Parameters
Note: The constants 10.8 and 6.6 generate results close to actual versus other theoretical values.
| Round Wire | Rectangular Wire (Wound on Flat) | Rectangular Wire (Wound on Edge) | Square Wire |
|---|---|---|---|
M= Ed4T 10.8NtD | M= Ebt3T 6.6NtD | M= Etb3T 6.6NtD | M= Ed4T 6.6NtD |
S= 32M πd3 | S= 6M bt2 | S= 6M tb2 | S= 6M t3 |
*(Typically the maximum design stress is 75% of the minimum tensile strength of the material.)
| D | Mean Coil Diameter (in. or mm) |
| d | Diameter of Round Wire (in. or mm.) |
| Nt | Number of Coils |
| E | Modulus of Elasticity (psi or MPa) |
| T | Deflection, number of turns or revolutions of spring |
| M | Moment or Torque (lbin or Nmm) |
| b | Width (in. or mm) |
| t | Thickness (in. or mm) |
| S | Bending Stress*, (psi or MPa) |
Here are just a small selection of the torsion spring and double torsion spring shapes we have produced, including:
- Brush Springs
- Clipboard Springs
- Closer Springs
- Double Torsion Springs
- Extended Leg Torsion Spring
- Hanger Springs
- Hinge End Torsion Springs
- Latch Springs
- Tine Springs
- Torsion Springs with Hook Ends
- Torsion Springs with Cross Body Bends
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