Spaenaur Catalog 14

Compression Limiters Limiteurs de compression

Metric

Métrique

Function of a Compression Limiter The primary purpose of a Compression Limiter is to preserve the integrity of a bolted joint in a plastic assembly. When bolts are tightened, they generate compressive loads that can damage or deform plastic components. A Compression Limiter prevents this by controlling how much the plastic is compressed, ensuring the joint remains structurally sound over the life of the assembly. How a Compression Limiter Works A Compression Limiter is designed to be slightly shorter than the thickness of the plastic host material. During bolt tightening:

1. The plastic compresses first, increasing internal stress. 2. Once the bolt head (or washer) makes contact with the Compression Limiter, the limiter restricts further compression. 3. Beyond this point, the limiter and plastic compress together at a controlled rate determined by the limiter’s material and design.

4. The Compression Limiter absorbs the additional clamping loads without causing significant added stress on the plastic. 5. This design prevents long‑term issues such as plastic creep, loss of clamp load, and degradation of joint performance.

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Criteria for a Properly Designed Bolted Joint To ensure reliability, a bolted joint using a Compression Limiter must meet the following requirements:

✔ Bolt Seating The bolt head (or washer) must seat firmly against both the plastic host and the Compression Limiter under load. This prevents the loss of clamping force caused by plastic relaxation over time. ✔ Proof Load Compatibility The rated proof load of the Compression Limiter must be equal to or higher than the proof load of the bolt. This ensures the limiter does not yield before the bolt under maximum clamping forces.

✔ Supporting Component Strength The mating surface on which the Compression Limiter rests must be able to withstand the localized compressive stresses produced by tightening. ✔ Clearance for Assembly Tolerances Adequate clearance must be provided between: • the maximum bolt diameter, and • the minimum installed inner diameter of the Compression Limiter This accounts for manufacturing tolerances and ensures proper assembly

Standard SPIROL® Compression Limiters are engineered to meet or exceed these requirements Additional Application Considerations Each assembly has unique requirements. When selecting a Compression Limiter, engineers must evaluate factors such as:

CATALOG 14.15

• Type of plastic host material • Minimum and maximum plastic thickness • Fastener size, grade, and tightening torque • Mating materials and structural requirements

• Corrosion resistance needs • Operating temperature range • Installation method (press‑fit, molded‑in, ultrasonic, etc.)

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