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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchFor a standard right-hand thread, turn counterclockwise to loosen it, viewed from the exposed end of the screw, nut, or lid you are turning. Turn clockwise to tighten. A left-hand thread reverses this: turn clockwise to loosen.
Which way should you turn to unscrew it?
For most ordinary screws and threaded fasteners, turn counterclockwise to loosen and remove the part. The familiar reminder is “lefty-loosey, righty-tighty”: counterclockwise loosens; clockwise tightens.
Judge the direction while looking straight at the exposed end of the part you are turning. If you look from the opposite end, clockwise and counterclockwise appear reversed. The same usual right-hand convention applies to common jar lids.
When does unscrewing mean turning clockwise?
A left-hand thread works in the opposite direction: it tightens counterclockwise and loosens clockwise. Left-hand threads are used in some applications to distinguish a connection or help keep normal operating motion from loosening it. VÖLKEL explains how to identify left-hand threads.
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Some gas-cylinder regulator connections use left-hand threads, but gas type and connection design matter. Los Alamos National Laboratory describes left-hand threads on flammable-gas regulators, while the Idaho State University Chemistry Department notes that a notch on the nut can identify many reversed-thread fuel-gas fittings. These are examples, not a rule for every cylinder or location. Follow the cylinder supplier’s instructions and the applicable site procedure. Los Alamos National Laboratory’s gas-safety guidance and BOC/Linde’s Australian gas-cylinder safety guidance describe their respective contexts.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What if the part will not turn or engage?
Resistance does not change the thread direction. Before applying more force, check whether the part uses a left-hand thread and whether the threads are compatible. Corrosion, damage, restricted access, or the assembly design can also make a correctly threaded part difficult to turn.
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For compressed-gas equipment, do not force a connection or improvise an adapter. USDA Agricultural Research Service guidance calls for matching cylinder valves, regulators, and fittings and checking threads for damage. Use the supplier’s instructions and the relevant site procedure; USDA’s compressed-gas cylinder safety guidance covers these checks.
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