Valores Sugeridos de Torque de Apriete La siguiente tabla es un valor estimado de apriete se ofrece solo como una guía. Será responsabilidad del usuario El tornillo más usado de manera común es el ASTM A325 3/4” con las roscas A325-N Bolts in Double Shear With rv = 31.8 k (double shear) (Table 7-1) Una costumbre que está arraigada fuertemente es que al montar pernos estructurales A325 y A490 se recurre a Tablas que indican el torque a aplicar. ESPECIFICACIONES (Specification tables). No. 1 Longitudes de rosca básica para Tightening torque for metric hexagon head bolts - Dekanewtons - meter. ASTM A325 Tension Tightening Torque Range (ft lbs) (Min - Max) Bolt Size TPI Min Max Galv+Waxed Plain 1⁄ 2 13 12,000 14,000 50 - 58 100 - 117 It is utilized in electric and telecommunication towers, in conjunction with nuts and bolts ASTM. Its function is to avoid the loosening of the nut, due to ASTM A325. High-Strength Bolts for Structural Steel Joints Including Suitable Nuts and Plain Hardened. Washers. ASTM A490. Quenched and Tempered Alloy Steel- Bolt size: Larger bolt diameters generally require higher fastening torque. Fastening torque will also vary according to length, grade, and torque coefficient