This is a combined solicitation for multiple related items, with award decisions made at the individual CLIN level, potentially resulting in multiple awards. The contract is for self-locking heavy hex nuts made of Nickel-Copper Alloy, designated as SPECIAL EMPHASIS material for use in a crucial shipboard system. Final delivery of material is required within 365 days after the effective date of the resulting contract, with certification data due 20 days prior. The contractor must maintain a quality system per ISO-9001 and provide extensive traceability and certification documentation. Performance of services is at the contractor's facility, subject to Government Quality Assurance at source.