01 October 2012
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Sealing collar nut designed to cut assembly time

Nut and bolt or stud fasteners are frequently required to lock and seal against liquids or gases. In these applications conventional fasteners can comprise several components and take time to assemble.

The latest product from Böllhoff Fastenings meets these requirements, having been designed to reduce assembly time by providing a high performance seal in a single operation.

Seal Lock a is a reusable one-piece fastener, which incorporates a moulded-in sealing ring which is threaded to ensure that there is no prevailing torque during run-down. Because the seal ring thread form is in perfect synchronisation with the thread in the metal body of the fastener, rather than on its collar, the quality of seal is optimised. In effect a high quality seal is achieved both inside the thread as well as under the flange of the nut.

The fastener can be reused up to five times and has a smaller footprint making is suitable for use where space is at a premium. Seal Lock has found application internationally in hydraulic and gas components where the prevention of leaks is critical and disassembly for servicing and repairs is routine. The polyamide seal is resistant to oils and solvents and has a temperature service range of -40 to 110°C. Other seal materials can be specified to meet specific performance criteria.

Paul Gay

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