SWS Series Medium Deflection Coil Springs (40% Deflection) - Flat Wire

These medium-deflection coil springs are used in injection mold accessory systems where a compact spring element must deliver stable force over repeated compression. A typical scenario is automotive connector and sensor housing molds, where guides, ejector-related mechanisms, or retention hardware require predictable load response as temperature and cycle rates increase.

In consumer electronics enclosures and small-part tooling, flat-wire construction helps improve packaging density and maintains more consistent spring behavior under limited installation space.

They are also suited for thermally stressed processing setups that see elevated ambient/tool temperatures, because this variant supports operation up to 200°C. Engineers commonly select the 40% deflection design when the mold assembly needs controlled travel (“allowable deflection”) and repeatable force for reliable actuation and part release support.

• 40% medium deflection supports predictable load vs. compression cycles
• Flat wire improves stability and consistent force behavior in tight layouts
• Heat resistance to 200°C helps maintain performance under thermal loads

The provided data for this SWS medium-deflection spring focuses on performance and heat resistance rather than a specific steel grade (e.g., SKD61/H13 or SKH51/M2). Therefore, material microstructure, exact hardness (HRC), and heat-treatment state (quench & temper, nitriding, etc.) cannot be stated from the current specification set.

What can be confirmed is the functional requirement: stable force behavior with heat resistance up to 200°C, which is typically associated with spring steels and protective finishing appropriate for tool environments. The flat wire form factor is a manufacturing-oriented choice that helps achieve controlled deflection and consistent load response in compact installations.

• Hardness (HRC): not specified in the supplied metadata
• Heat treatment: not specified in the supplied metadata
• Trade-offs: without grade and temper data, wear resistance vs. toughness cannot be quantified

If you share the exact spring steel grade and drawing tolerance notes for this series, we can document hardness, wear resistance expectations, and the corresponding heat-treatment route accurately.

Correct sizing starts by matching the spring’s D (10.5 ~ 52 mm) and L (20 ~ 300 mm) to the available envelope in your mold cavity/core support area. The inner diameter d is configurable for flat-wire type only and ranges from 5.5 ~ 37 mm, so verify clearance around shafts/bolts and any guide features before final selection.

Next, ensure force and travel requirements align with the spring’s working range. Use the specified allowable deflection (8 ~ 120 mm) to set the target compression during operation, and confirm the required spring constant (2.73 ~ 1307 N/mm) and load (87.2 ~ 1570 N) at your planned deflection.

• Envelope match: choose D and L within 10.5–52 mm and 20–300 mm
• Clearance match: choose d within 5.5–37 mm (flat type)
• Performance match: verify allowable deflection and load at the working compression

Finish option with/without paint peeling is selectable (Yes/No) to match assembly handling and adjacent components requirements; dimensional tolerances are not provided in the supplied spec set, so use your drawing and supplier datasheet for fit-critical interfaces.