SSWA Series 1018 Carbon Steel Coil Spring Washers

Where it’s used: These coil spring washers are specified in injection mold tooling when springs must maintain stable seating during repeated clamp, ejector-actuation, or spring-return cycles.

• Spring unit assemblies for ejector return: Use the type variant to keep the spring centered and prevent rocking, improving repeatability under cyclic load.
• Automotive and general industrial connector tooling: In compact spring stacks, choose the available height options to achieve correct preload and consistent support across parts with varying spring free-length and load ratings.
• Fixture and wear-compensation mechanisms: When tolerances stack up across the spring stack-up, selecting an appropriate outer diameter within the 5–39 mm range helps ensure proper contact area.

Why this variant suits these uses: Manufactured from 1018 carbon steel, it provides dependable support for spring seating and is available in 1.0–5.0 mm heights, enabling precise stackup control for stable performance in spring-related components.

Steel grade (1018): The washer is made from 1018 carbon steel, a low-carbon steel typically used for parts that require good formability and reliable mechanical strength without the brittleness of higher-hardness tool steels.

Heat treatment state: Based on the provided data, the specification is for 1018 carbon steel washers; heat-treatment details (e.g., quenched & tempered or nitrided) are not specified. In practice, such washers are commonly used in a supplied condition optimized for manufacturability and assembly fit.

• Hardness / wear vs. toughness: Low-carbon steels generally prioritize toughness and dimensional stability over extreme wear resistance; expect moderate wear resistance compared with hardened spring steels.
• Trade-off: Suitable for supporting springs and maintaining seating, while high-abrasion environments may require hardened or coated alternatives (not provided in this dataset).

For applications demanding higher surface durability, verify whether your project can use a hardened washer material in the same dimensional envelope.

Step 1: Match outer diameter (D): Select a washer with outer diameter D = 5 to 39 mm so the washer covers the intended support area around the spring seat. Use the cavity/core or support plate contact geometry to determine the required OD clearance.

Step 2: Choose height (t) for stackup/preload: Pick the appropriate thickness/height from the available options: t = 1.0, 2.0, 3.0, 4.0, or 5.0 mm. The correct height ensures the spring seats squarely and achieves the intended stack height in the assembly.

• Step 3: Tolerance & fit checks: Confirm that the chosen OD and height allow for machining tolerances in the spring pocket and any counterbore/bearing surface. If the assembly relies on centering, verify concentricity requirements and avoid undersupport caused by a washer OD that is too small.
• Fixed vs. configurable dimensions: Dimensions are fixed by the selected size (D within 5–39 mm, and t selected from the listed discrete values).