Nitinol rope is formed by winding several nitinol wires together.
Multi-strand Nitinol wire, also referred to as Nitinol rope, is manufactured by twisting multiple Nitinol wires together into a single, flexible cable. This construction combines the exceptional mechanical advantages of Nitinol with the structural versatility of wire ropes.
Multi-strand nitinol wire
These ropes retain the hallmark properties of Nitinol—namely, superelasticity and the shape memory effect—while also offering enhanced flexibility, precision control, and miniaturization similar to stainless steel wire ropes. The result is a high-performance wire solution ideal for demanding medical and industrial applications.
What Makes Nitinol Unique?
Nitinol is a nickel-titanium alloy known for its unique thermomechanical behavior. The shape memory effect allows the material to return to its original, pre-set shape when heated above its transformation temperature, even after significant deformation. Superelasticity, on the other hand, occurs just above this transformation temperature, allowing the alloy to stretch and flex with extreme elasticity—up to 10 to 30 times more than typical metals—without permanent deformation.
All mechanical properties mentioned here are based on testing at 22°C ± 2°C, under ASTM F2516-18 standards.
Mechanical Properties (Straight Annealed):
| Condition | Superelastic |
| UTS (σᵦ), MPa [ksi] | ≥1000 [145.0] |
| Elongation (ε%) | ≥10 |
| UPS (σload), MPa [ksi] | ≥350 [50.8] |
| Permanent set after 6% strain (%) | ≤0.5 |
| Active Af (°C) | -10-20 |
Typical Medical Applications: Guidewires, stents, shapeset parts, dental files, orthodontic archwires, etc.
* All mechanical testing conducted at 22°C±2°C per ASTM F2516-18
Surface Finishes Available:
Black Oxide: Offers durability and resistance to corrosion.
Light Oxide: Colors range from golden yellow to brown, depending on the finishing process.
Nitinol Rope
Common Applications of Multi-Strand Nitinol Wire
Due to its unique combination of flexibility, strength, and biocompatibility, multi-strand Nitinol wire is widely used in the medical field, including but not limited to:
Orthopedic Cable Systems
Spinal Fixation Devices
Orthodontic Tools and Archwires
Endoscopic Instruments
Laparoscopic Systems
Snares and Retrieval Devices
Basket Devices for Stone Extraction
For premium-grade multi-strand Nitinol wire, Edgetech Industries offers tailored solutions to meet the highest standards in the medical and industrial sectors.
Structure and type of nitinol rope
| Structure | Diameter Range, mm [inch] | Diameter Tolerance, mm [inch] | |
 | 1*2 | 0.15~0.30 [0.00591~ 0.01181] | +0.03/-0 [+0.00118/-0] |
 | 1*3 | 0.20~0.45 [0.00787 ~ 0.01772] 0.50~0.60 [0.01969 ~ 0.02362] | -0.03/-0 [-0.00118/-0] +0.06/-0 [+0.00236/-0] |
 | 1*7 | 0.18~0.45 [0.00709 ~ 0.01772] 0.50~0.70 [0.01969 ~ 0.02756] 0.80~1.20 [0.03150 ~ 0.04724] | -0.03/-0 [+0.00118/-0] +0.06/-0 [+0.00236/-0] +0.10/-0 [+0.00394/-0] |
Packaging of Wires
Spool: wire must be wound evenly on the spools, without breaks or tangles;
Fixed Length: Edgetech can cut the wire to the customer’s requested length.
* Other packaging methods could be discussed with Edgetech.
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