A comprehensive specification should include:
Standard and Grade: e.g., ASTM A322 Grade 4140.
Condition: e.g., Hot-Rolled, Annealed; Cold-Drawn, Stress-Relieved; Quenched & Tempered to HB 285-321.
Dimensions and Tolerances: Diameter, length, straightness, per a standard like ASTM A29.
Heat Treatment (if QT): Required tempering temperature or final hardness range.
Special Testing: Impact testing at a specified temperature, magnetic particle inspection, ultrasonic testing for internal defects.
Certification: Requirement for a Mill Test Certificate (MTC) listing Heat Number, chemical analysis, and mechanical test results.
Marking: Requirement for permanent identification (Heat/Batch number, grade, size) on each bar.