Heavy Duty Trucking, July 2015
Other recommendations Cores Materials not affected by moisture or plywood effectively sealed against moisture intrusion Non wood composite materials stand a better chance of living for the desired 12 years Reinforcements Applied at points and in areas where stress and impacts are expected Scuff panels of 14 gauge galvanized steel or other rugged materials should be at least 8 inches high across the full width of the doors Acceptable alternatives include resilient bottom corners and replaceable lower edge door panels Edge seals UV resistant elastomeric materials that conform to door frames and headers and able to withstand temperature extremes from 40 to 120 degrees and easily replaceable Fasteners Should not penetrate plywood cores so moisture doesnt travel inside An exception is use of staples to attach door seals but penetrating holes should then be sealed Hinges 3 inches wide 6 inches long and 3 16 inch thick Floors Look inside a dry van trailer and youre most likely to find a laminated hardwood floor in fact some for steel and inch for aluminum with three per door panel for metallic core types and four per panel for composite doors Hinge pins Of at least 3 8 inch steel treated to ASTM 123 standards Hinge brackets or butts Minimum 5 16 inch steel for the cantilevered section with a minimum yield strength of 50000 pounds per square inch The brackets should not be removable except by burning or cutting when the doors are closed and locked Lock rod assemblies Galvanized steel able to operate through 12000 cycles with strength to rack the doors tightly closed Two is the norm but some customers spec three or four lock rods for extra strength and body rigidity Locking handles One per door panel with the road side locking first a provision for use of seals or padlocks and secured by tamper proof fasteners Holdbacks Able to secure fully opened doors against side panels and hold against 65 pounds of pulling force for 1000 cycles 95 Thats because it provides a good combination of strength durability and long life at reasonable cost says John Carr vice president Introducing the new member COOLEST to the roll up door family Standard Features Include Improved Veil Material for Smoother Surface Finish Polyaspartic Painted Top Coat Hold Open Door Keeper Long Life SupeRollers Quick Snap Dual Durometer EZ Side Seals Removable Roller Hinges Everware Hardware Inside Out Aluminum Bottom Angle E Coated C B Assembly 1 1 1 8 or 2 1 2 Thickness with 1 or 2 Track Option phone 800 999 3392 visit us at www todco com Circle 212 on Reader Action Card sales and marketing at Havco Hardwoods flexibility allows it to bend slightly with the trailers structure as it moves along a road www truckinginfo com JULY 2015 HDT 83
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