6 Pneumatic Gas Cylinder for Herman Miller Classic Aeron Chair, Office Chair Hydraulic Cylinder Replacement, Stroke Gas Lift Cylinder#1B08VM, Heavy Duty 450lbs New Pneumatic Cylinder, Gas Cylinder, Class 4. CLASS 4 LEVEL GAS LIFT CYLINDER? This gas lift cylinder is designed to meet the high construction industry standard (BIFMA Plus Quality) for Herman Miller Aeron Chair cylinders, ensuring reliable office chair seat height adjustment. Office Chair Hydraulic Cylinder Replacement Reference code: 1B08VM B/C. ADJUSTABLE HEIGHT OF 6 INCHES? With a stroke length of 6.0 inches, this Pneumatic Gas Cylinder for Herman Miller Classic Aeron Chair allows for smooth seat travel from the lowest to highest seating positions. The small black tube has a diameter of 1.1″ (28mm), the middle chrome tube has a diameter of 1.3″ (33mm), and the outside big black column has a diameter of 2 (50mm). EXCEEDS ANSI/BIFMA5.1-2011 STANDARDS? This Office Chair Hydraulic Cylinder Replacement surpasses the specifications outlined in ANSI/BIFMA5.1-2011 standards, guaranteeing its load capacity of up to 350 pounds. REPLACEMENT PARTS FOR HERMAN MILLER AERON CHAIR? If your chair experiences difficulty lifting, adjustments may be required on two screws located near where the cable attaches. HEAVY DUTY PISTON SUPPORTING UP TO 450LBs? This Pneumatic Gas Cylinder for Herman Miller Classic Aeron Chair serves as a replacement for Classic Herman Miller Aeron Chairs in Size A, Size B, and Size C models manufactured between 1996 and 2012 only.