Screw conveyors - Specification for portable and mobile type (augers)What is BS 4409 2 Screw conveyors about? BS 4409 2 is a British standard and a part of the BS 4409 series that discusses the specification for portable and mobile types of screw conveyors. Screw conveyors are used for conveying bulk material from almost any position (vertical, horizontal, or at an incline) and are one of the most reliable methods of conveyance. BS 4409 2 specifies the requirements for the materials, dimensions, power provision and the

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