Turnbuckles should be made of which material?

Turnbuckles are typically made of cast steel because this material provides the necessary strength and durability required to withstand the significant tension and stress they encounter during use in rigging applications. Cast steel offers excellent mechanical properties, making it suitable for adjusting tension in cables or ropes effectively while maintaining structural integrity.

Aluminum, while lightweight, lacks the strength required for heavy-duty applications and could deform under high loads. Bronze, though resistant to corrosion, does not possess the same load-bearing capacity and is often used for different applications, such as marine hardware. Plastic is not suitable for turnbuckles due to its inadequate strength and potential for failure under load. Therefore, cast steel is the ideal choice for constructing turnbuckles in terms of safety, performance, and longevity.