Stuffing box

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Stuffing Box

The stuffing box or packing gland is a sealing method used to keep water out of the vessel at the point where the stern tube penetrates the hull.

The traditional stuffing box usually consists of a cast or machined part that fits over the shaft or is bolted to the inboard end of the stern tube. This part holds packing rings made of flax impregnated rope with a square cross section that are compressed against the shaft using a threaded fixture or a series of nuts. Stuffing boxes of this sort leak a small amount, but this serves as lubrication and if properly adjusted is not enough to cause a problem for the vessel

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