High Deflection Coil Springs (50% Deflection) SWR Series

This high-deflection coil spring is used inside injection mold mechanisms where designers need stable compliance while the spring works deep into stroke. Its 50% deflection target helps maintain more predictable force as the moving components travel, reducing variability during cycling.

• Automotive connector and terminal molds: In hot-runner or high-cycle runner systems, the flat-wire geometry supports consistent return force for ejector-actuated compliance parts, especially where temperatures approach 200°C.
• Packaging and appliance housing molds: The spring’s controlled allowable deflection (7.5–200 mm) suits load-support requirements in large cavity structures, helping compensate for deflection-related tolerance stack-up.
• Medical device enclosure tooling: For mechanisms needing repeatable loading under deflection, the design supports reliable force delivery across varying cycle conditions.

Choose the flat-wire variant because it is intended to deliver repeatable force characteristics under significant deflection while sustaining performance up to 200°C.

For this product variant, the provided specification confirms 200°C heat resistance, making it suitable for mold accessories exposed to hot-process conditions. The flat wire design is a key manufacturing feature that influences spring stiffness consistency and helps maintain spring geometry under repeated loading.

• Heat resistance: Rated for operation up to 200°C, helping preserve performance during elevated-temperature molding cycles.
• Material/heat treatment: The input data does not specify the exact steel grade, hardness (HRC), or heat treatment state (e.g., quenched & tempered, nitrided). Therefore, material microstructure and hardness trade-offs cannot be stated from the available parameters.
• Manufacturing process relevance: Flat-wire coil construction improves uniformity of the spring’s cross-section response, supporting stable spring constant across the intended deflection range.

If you need hardness or grade verification for critical wear or fatigue requirements, please request the material certificate for the specific size range.

Start sizing by matching the spring’s allowable deflection and required load at the target stroke position. The product supports 7.5–200 mm of allowable deflection, with a spring constant range of 1.7–52.96 N/mm, which directly determines force response.

• Diameter (D): Select D = 10.5–50 mm to fit the surrounding guide space around the mold mechanism.
• Length (L): Choose L = 15–400 mm based on available axial room and desired coil working height.
• Inner diameter (d): For the flat type only, pick d = 6–36 mm to clear the shaft/rod and maintain alignment.
• Load target: Confirm the expected load of 78.5–1324 N at your working deflection; ensure your operating point stays within the allowable deflection band.

Tolerance/fit guidance is not provided in the input data; however, for flat-wire springs, alignment against the shaft (using d) is critical to avoid side loading and force variation. Paint finish can be selected via the with/without paint peeling option.