Model BJC488 BJC588 BJC688 Square Drive 1＂(25.4mm) 1＂(25.4mm) 1＂(25.4mm) Bolt Capacity M41 M41 M50 Torque ft.lb.(N.m) 1771ft-lbs(2400N-M) 1808ft-lbs(2450N-M) 1881ft-lbs(2550N-M) Torque Range ft.lb.(N.m) 811.8-1771.2ft-lbs (1100-2400N.M) 811.8-1808.1ft-lbs (1100-2450N.M) 738-1881ft-lbs (1000-2550N.M) Free Speed RPM 4000rpm 4000rpm 4000rpm Weight lbs.(kg) 25.4lbs(11.5kg) 26.2lbs(11.9kg) 25.9lbs(11.8kg) Sound dBa ≤100dB ≤100dB ≤100dB Blow per Minute 400 580 400 Air.lnlet in. (mm) 1/2＂(13mm) 1/2＂(13mm) 1/2＂(13mm) Min. House Size in. (mm) 1/2＂(12.7mm) 1/2＂(12.7mm) 1/2＂(12.7mm) Avg. Air Consumption CFM 12cfm(340l/min) 12cfm(340l/min) 12cfm(340l/min)