Description
- Dynalloy NiTi Tension Spring, 4-Pack
- Demonstrates precise mechanical movement
- Extends to 14 cm when cool
- Contracts to 29 mm when heated
- Activates between 55°C and 85°C
- Use in series or parallel for flexibility
The Dynalloy NiTi Tension Spring (4x) is a versatile demonstration product designed for applications requiring precise mechanical movement. These springs can be extended or deformed to a length of approximately 14 cm when in a cool state, utilizing a force of about 6N. Upon heating, they contract to a compact size of approximately 29 mm, requiring a force of approximately 8.4N and an electrical current of 3 Amps. The springs are constructed with a wire diameter of 750 µm and activate within a temperature range of approximately 55°C to 85°C.
This product is packaged in a set of four, allowing for flexible configurations. Users can employ multiple springs in series to achieve greater extension distances or in parallel to enhance the force exerted. The force and amperage values are subject to variation based on specific applications, making these springs suitable for a range of experimental and practical uses.
- 4x Dynalloy NiTi Tension Spring
- Length when cool: 140 mm
- Length when heated: 29 mm
- Can be extended or deformed with approximately 6N when cool
- Contracts with approximately 8.4N at 3 Amps when heated
- Activates at approximately 55°C - 85°C
- Force and amperage values may vary
- Use in series for greater distance or in parallel for greater force
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Refund Policy
If you are not satisfied with a product purchased from the Site, you may request a return within 30 days from the delivery date, unless the product is listed under the Return Exceptions below or is subject to specific return conditions noted on the product page.
Please review the Return Conditions, Return Exceptions and the process on How to Request a Return Authorization (RA) before initiating a return request.
Returns under this policy concern non-defective products. In the case of a confirmed manufacturing defect, remedies are handled under the Warranty terms, at RoboItchi's discretion. See the Warranty section.
Return Conditions
To qualify for a refund under the 30-day return policy, all of the following conditions must be met:
- A valid Return Authorization (RA) number must be obtained prior to returning the product. Returns without an RA number will be refused.
- The RA number is valid for 30 days. The returned item must be received within that period.
- The RA number must be included with the return.
- Products must be returned in unused, unmodified condition (e.g., no scratches, alterations, missing parts, or signs of installation/use) and in their original packaging, suitable for resale.
- Shipping fees are non-refundable. Return shipping costs are the responsibility of the customer, except in cases of a product confirmed defective through RoboItchi's troubleshooting process or of a verified shipping error by RoboItchi.
- Refunds are processed within 7 days after receipt and inspection of the returned item.
- A ¥10,000 cleaning fee may apply to domestic robots returned in used or unclean condition.
- A 20% restocking fee may apply to large-quantity returns of items ordered specifically for the customer from the manufacturer or not part of RoboItchi's standard inventory.
Return Exceptions
The following products are not eligible for return or refund under this policy:
- Used, damaged, or modified products — Items that show signs of use, wear, or alteration, making them unsuitable for resale.
- Consumables — Use and wear-and-tear components, altered or depleted through use (e.g., batteries, belts, brushes, gears, filament, tires, disposable bags, lubricants, greases, waxes, etc.). Not eligible for return once opened or used.
- Perishables — Goods liable to deteriorate or expire rapidly. Not eligible for return.
- Sealed goods (health or hygiene) — Items sealed for health-protection or hygiene reasons (e.g., masks, gloves, odor-absorbing products). Not eligible for return once unsealed.
- Build-it-yourself products and items requiring customer assembly — Including robots & kits, robot parts, and other products requiring assembly or soldering. Not eligible for return once assembled, soldered, or installed.
- Digital Goods, Software, and Apps — Final sale only, due to licensing restrictions.
- Clearance Items — Products identified as clearance or final sale, including end-of-life or discontinued items.
- Custom-made, personalized, or special-order items — Products manufactured, configured, adapted, or built to the customer's own specifications and requirements.
- On-Demand Items — Standard catalogue products not stocked by RoboItchi and ordered specifically to fulfill a customer request.
- Professional & Specialized Equipment — See the Professional & Specialized Equipment Warranty page and Professional & Institutional Buyers (B2B) section in the Terms & Conditions.
How to Request a Return Authorization (RA)
To request a return, submit a support ticket from your account under My Support Tickets to obtain a Return Authorization (RA) number. Returns without an RA number will be refused.