THREAD: AS8879 MATERIAL: Carbon steel, heat treated. FINISH: Cadmium plate per AMS-QQ-P-416, Type II, Class 2, plus Kaylube molybdenum disulfide dry film lubricant coat per AS5272. PERFORMANCE: NASM25027, except axial tensile strength as tabulated based on 160 000 PSI. TEMPERATURE: 450°F. VARIATIONS: Add "BC" for bottom countersunk rivet holes. Example: MK1400-4BC.