Whether for home, farm, builder or industrial customers, National has all the right hardware in the sizes and finishes you need. With over a century of service National is committed to maintaining the highest level of product quality, innovation and manufacturing technology.
- Designed for use with box rail on wood-frame metal-clad door using a 2 in. x 4 in. or 2 in. x 6 in. frame
- Delrin seals keep out dirt while holding in long-life grease
- The 1/2 offset bolt adjusts both vertically and laterally from inside door
- Connecting bolt threaded 7 in. adjusts laterally 1 in. by turning offset bolt for desired clearance
- Each hardened axle has 12 hardened and precision-ground alloy steel roller-bearings
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