Bar clamps have adjustable arms that are easily widened or narrowed to fit the work piece and, therefore, requires fewer turns of the screw spindle, compared to a C-clamp, to hold the piece tightly. DO Wear safety glasses or a faceshield. Ensure that the pressure plate and anvil parts of the clamp are in full contact with the workpiece before tightening. Use pads with C-clamps to avoid marking the work. Remove clamps as soon as the job is finished.
Clamps serve only as temporary devices for holding work securely in place.
Keep all moving parts of clamps lightly oiled and keep tools clean to prevent slippage. Also make sure there is no dirt or oil on any part that will come in to contact with the work. Store C-clamps by clamping them in a rack, not in a drawer. Do not use extra large clamps just for the sake of their large throats. Instead, use, deep-throat clamps.