Screw clamps consist of a band (usually in the USA) into which a thread pattern has been cut or pressed. One end of the band contains a captive screw. The clamp is put around the hose or tube to be connected, with the loose end being fed into a narrow space between the band and the captive screw. When the screw is turned, it acts as a pulling the threads of the band, causing the band to tighten around the hose (or when screwed the opposite direction, to loosen). Screw clamps are normally used for hoses 1/2 in diameter and up, with other clamps used for smaller hoses.
Pairs of screw clamps on a short rubber unit form a "no-hub band," often used for attaching sections of piping, or used for other pipes as a flexible coupler (to fix alignment difficulties or to prevent pipe breakage due to relative movement of sections) or an emergency repair.
They can also be used in a similar way, as a simple means for the transmission of small amounts of . A short length of hose is clipped between two where or variations in alignment may be taken up by the flexibility of the hose. This technique is well adapted to use for mock-ups in a development laboratory.

A similar type of clamp to the screw band, also with a solid screw and an interesting history, described here: .
,hose clamp with thumb screw Innovative design is easy to install and remove, no tools required. Available in
a variety of sizes for multi-purpose use.

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