本采购规范涵盖了具有均匀矩形横截面的螺旋缠绕型挡圈，由统一编号系统UNS S66286标识的耐腐蚀和耐热时效硬化铁基合金制成，经过加工强化和热处理，在室温下拉伸强度为185至240 ksi。

This procurement specification covers retaining rings of the spiral wound type with uniform rectangular cross-section, made of a corrosion and heat resistant age hardenable iron base alloy of the type identified under the Unified Numbering System as UNS S66286, work strengthened and heat treated to a tensile strength of 185 to 240 ksi at room temperature.