Constructed to withstand heavier loads.
The #3521G Heavy Duty 12 gauge steel mechanism has many deluxe features such as noiseless bearings, rubber bumper stops, easily operated height adjustment lever, forward mounted spring tensioning and an all positioning lever which is user defined to set the seat cushion and back at virtually any predetermined angle and what's more...lock it at that angle!
As a companion, a preassembled equally heavy use load Gas cylinder with column is also available #10765HDCOM. Making installation or retrofitting easier are the 18 1/2" long steel rails, predrilled mounting holes at 17". The rails can be shortened if necessary with an ordinary hacksaw. Width from hole to hole is 8". This mechanism will accommodate from small to large executive sized chairs.
Northfield Metal Products
18 1/2" overall length
Heavy duty 350 lb user weight