Explosion A type F wrench used GB GB10686-10693-89 proof tools by the National Light Industry Quality Supervision and Inspection Center high hardness aluminum bronze hardness HRC) 25, explosion-proof level II Class B grade;. Beryllium hardness HRC) 35, explosion-proof level Class II C-class. The products are widely used in petroleum, chemical, mining, military, shipbuilding, natural gas, liquefied petroleum gas, pharmaceuticals, gas, transportation, vegetable oil and other flammable places ideal security tool. F-type wrench special for tightening or removing machine tools, vehicles, machinery and equipment round nut on the IIC with explosion-proof performance to the highest level applicable to 21% of the hydrogen concentration in the work environment does not produce sparks, do not detonate gas .F wrench Use:. beryllium: applies to 21% or less of hydrogen concentration in the job, the standard code GBExIIC; aluminum bronze suitable concentration of 7.8% or less of ethylene gas in industry standard code GBExIIBF do wrench (special wrench) category includes rigid, box wrenches and combination wrenches, live wrench, tap wrench, curved handle wrench, hex wrench, pry bar wrench, universal wrench, ratchet wrench, fast afterburner wrench, socket wrench, socket head, hook spanner, wrench, valve wrench, F wrench, T-wrench, K-type wrench, Y type wrench, L-type wrench, two claws valve wrench, claw valve wrench, six claw valve wrench, slip F wrench, valve wrench slip, complete model, also based on user requirements or drawings production.