1 1/4-7 Castle Nut Zinc (Pack Qty 20) BC-125NHC

A six-sided internally threaded fastener which is both thicker and wider across the flats than a same sized finished hex nut. Nuts in sizes 7/16 & smaller shall be double chamfered. Larger sizes are either double chamfered or chamfered on top with a washer faced bearing surface. This is the strongest of all comparably-graded nuts because of its greater length of thread engagement and greater resistance to dilation (widening or stretching). Grade-5 nuts are used with medium-carbon cap screws/bolts Grade-A nuts are used with low-carbon heavy hex bolts. Grade-C nuts are recommended for use with A-325 structural bolts. Grade-2H nuts are recommended for use with bolts in high-pressure and high-t Nuts shall be made from a steel which conforms to the following chemical composition requirements (heat analysis)-- Grade-5-- Carbon: 0.55% maximum; Manganese: 0.30% max; Phosphorus: 0.05% maximum; Sulfur: 0.15% maximum. Grades-A & C-- Carbon: 0.55% maxim