Unraveling the Mystery Behind the 5-50 Cord: Understanding Its Origins and Applications
The term 5-50 cord for a type of strong and versatile nylon cord has an intriguing history. Originally developed for military parachutes, this cord has found its way into various civilian applications. But, why is it called 5-50 cord? This article delves into the details.
Origins and Development of the Military Parachute Cord
The term parachute cord initially emerged as a necessity for the military, specifically for use in the suspension lines of parachutes. These cords are a critical component for ensuring the safety and functionality of airborne operations. Over time, parachute cord became popularly known as 550 cord due to its standard breaking strength of 550 pounds (approximately 249.5 kilograms).
The 5-50 Cord: Its Working Strength and Safety Factor
The naming of 5-50 cord is directly related to its working strength and safety factor. For a type-III parachute cord, its working strength is typically 110 pounds, with a safety factor to break of 5. This means that the cord is designed to withstand at least 550 pounds before failing, ensuring it can safely carry its rated load and provide an additional margin of safety.
Construction and Specification
Parachute cord is constructed as a kernmantle rope, featuring a woven outer sheath and several inner strands. The outer sheath is made up of a high number of interwoven strands for its size, providing a smooth texture and enhancing durability. The kern, or core, consists of several yarns made from nylon fibers. Type IA and IIA differ from their type I and II counterparts in not having a core, while type III, frequently found in use, has a minimum breaking strength of 550 pounds.
Current Technical Standards and Military Requirements
Current technical standards for the manufacture of parachute cord are maintained by the Parachute Industry Association. The US military's standard for type III parachute cord, MIL-C-5040H, requires it to be made of nylon. Similar materials like polyester are also used to create similar, yet slightly different, styles of cord.
Applications Beyond Military Use
Due to its unbelievable strength, lightweight nature, and versatile construction, parachute cord has become a go-to utility cord for both military personnel and civilians. It is widely used in camping, survival gear, crafting, and even by astronauts for critical tasks in space. For example, during the 82nd Space Shuttle mission, astronauts used parachute cord to repair the Hubble Space Telescope, demonstrating its extraordinary versatility.
Conclusion
The term 5-50 cord encapsulates the remarkable strength and reliability of this versatile cord that originates from its military roots. Its designation as 550 cord is a testament to its breaking strength, making it indispensable for a myriad of applications far beyond its original purpose. Understanding the origin and characteristics of parachute cord can help in making informed decisions for various projects and applications, whether personal or professional.