Precise Retention Knobs – Style 4, CAT40/50

• Heat Treated alloy steel hardened to HRC 52-56
• ANSI/AMSE B5.50-1994

Item No. 3900-5512 3900-5513 3900-5520 3900-5521 Thread T.P.I. 5/8 ~ 11 M16x2.0 5/8 ~ 11 M16x2.0 Knob Dia. D1 0.740″/18.79mm 0.740″/18.79mm 0.740″/18.79mm 0.740″/18.79mm Neck Dia. D2 0.488″/12.4mm 0.486″/12.34mm 0.486″/12.34mm 0.486″/12.34mm Hole Dia. D3 N/A N/A 0.276″/7mm 0.276″/7mm Pilot Dia. D4 N/A N/A N/A N/A Diameter D 0.886″/22.5mm 0.886″/22.5mm 0.886″/22.5mm 0.937″/23.8mm OAL L 1.535″/39mm 1.535″/39mm 1.496″/38mm 1.496″/38mm Shoulder L1 0.433″/11mm 0.433″/11mm 0.433″/11mm 0.433″/11mm Shoulder L2 1.26″/32mm 1.26″/32mm 1.24″/31.5mm 1.24″/31.5mm Item No. 3900-5492 3900-5519 3900-5522 3900-5524 Thread T.P.I. 1~8 M24x3.0 1~8 M24x3.0 Knob Dia. D1 1.140″/28.95mm 1.140″/28.95mm 1.140″/28.95mm 1.140″/28.95mm Neck Dia. D2 0.820″/20.83mm 0.820″/20.83mm 0.820″/20.83mm 0.820″/20.83mm Hole Dia. D3 N/A N/A 0.451″/11.45mm 0.451″/11.45mm Pilot Dia. D4 N/A N/A N/A N/A Diameter D 1.417″/36mm 1.437″/36.5mm 1.437″/36.5mm 1.437″/36.5mm OAL L 2.307″/58.6mm 2.307″/58.6mm 2.307″/58.6mm 2.307″/58.6mm Shoulder L1 0.692″/17.58mm 0.692″/17.58mm 0.692″/17.58mm 0.692″/17.58mm Shoulder L2 1.969″/50mm 1.969″/50mm 1.969″/50mm 1.969″/50mm