Pneumatic wrench pneumatic wrench gas trigger BK20, BK20 pneumatic wrench, BK20 gas trigger pneumatic wrench BK30, BK30 pneumatic wrench, BK30 gas trigger pneumatic wrench BK42, BK42 pneumatic wrench, BK42 gas trigger pneumatic wrench BK56, BK56 pneumatic wrenches, BK56 BK20 gas trigger pneumatic wrenches, pneumatic wrenches with security proof, torque, light weight, small size, high efficiency, simple structure, easy maintenance and a series of features. Stable output speed to meet the requirements under the pressure fluctuations in the coal mine is large, U-shaped steel can be used to dismantle the nut bracket and tighten the nut and bolt bracket removal, resin bolt agitation and other mechanical and electrical equipment, can improve U-shaped steel bracket bolt bracket and performance, supporting quality assurance. The series can be widely used in gas trigger automobile, shipbuilding, petrochemical, locomotives, construction and other industries. 20 nuts on the edge size, type of work pressure rated torque idling speed idling gas consumption noise Apothem square head size tracheal diameter Weight BK20 0.4-0.63 ≥ 490 ≥ 6000 ≤ 1.2 ≤ 118 37 19 × 19 16 4.2 BK30 0.4-0.63 ≥ 882 ≥ 5500 ≤ 2.4 ≤ 118 42 19 × 19 16 5.8 BK42 0.4-0.63 2000 ≥ 5000 ≤ 2.5 ≤ 118 55 25.4 × 25.4 16 9.5 BK56 0.4-0.63 ≥ 6500/7 ≥ 4500 ≤ 3.6 ≤ 118 65 32 x 32 19 18 BK20 mine gas trigger type applies to M18 ~ M20 thread, BK30 mine gas trigger type applies to M24 ~ M30 thread, BK42 mine gas trigger type applies to M27 ~ M42 thread