Explosion-proof curved handle tap wrench

Proof curved handle tap wrench made of: bronze, aluminum bronze alloy of two, in which beryllium materials face hardness HRC35 ° or more, and a tensile strength δ b> 105-120kgf / mm2; aluminum bronze material face hardness HRC25 ° or more, and a tensile strength δ b> 75-85kgf / mm2; proof performance in line with the national standard GB10686-89. Proof curved handle tap wrench applies more paint, oil, petrochemical, natural gas, coal variety of flammable and explosive work environment tightening or removing one or two sizes of hex head, square head bolts, nuts, and do percussion use.