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Qualitydoor.com > Closers > Door Closers > Norton 8501 Series Multi-Size Unitrol Door Closers

Norton 8501 Series Multi-Size Unitrol Door Closers

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SKU: UNI8501-689-24

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Norton 8000 Series Catalog

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Norton 8501 Series
Multi-Size Unitrol Door Closers

Multi-size power: The closer spring assembly can be adjusted through a wide power range

Two Power Ranges: Adjusted through a range of sizes, 2 through 6

Non-handed

Aluminum alloy shell: Closer bodies are constructed of a special aluminum alloy

Adjustable back check cushioning

Adjustable delayed action closing

Non-critical Valves

Molded full cover

Unitrol arm (parrallel arm only), please specify door width

Adjustable sweep speed: An independent regulating valve, hex-keyed-operated, permits adjustment of the general closing speed.

Latch speed: An independent regualting valve, hex-key-operated, permits adjustment of the door's speed for approximately the last 5 degrees of the closing cycle.

Unitrol arms combine the features of a double lever arm overhead door stop/holder with the backcheck feature of the door closer to reduce door stopping shock loads to a minimum. The Unitrol uses a compression spring buffer at the soffit plate/arm shoe that will absorb 30 lbf. of force, 5° prior to the door’s dead stop. Coupled with the door closer’s backcheck feature, this arm provides the most controlled stop available with a surface door closer.

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Norton 8000 Series Catalog

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