Pronunciation: [spɹˈaɡ] (IPA) 
The word "sprag" is spelled with the letters S-P-R-A-G. It is pronounced /spræɡ/ in IPA phonetic transcription. This word refers to a device used to secure or stop the motion of a wheel or vehicle. Though it has a simple spelling, the pronunciation may not be immediately clear to some, as the vowel sound in the first syllable is the short 'a' sound, while the 'g' is pronounced with a hard 'g' sound.
Sprag is a term used to describe a heavy-duty braking device, typically found in mechanical equipment such as winches or cranes, that is designed to hold or prevent the movement of a rotating shaft or wheel. It functions by exerting pressure or friction on the rotational surface, thereby reducing or stopping its motion altogether. This action is achieved by engaging the sprag against a specific component, such as a wheel or a toothed surface, to create a locking effect.
Sprags often consist of steel plates or rollers that are arranged in a specific pattern to increase their effectiveness. When the sprag is engaged, it creates a rigid connection between the rotating component and the stationary part of the equipment, ensuring that any movement is restrained. This is particularly useful in situations where the potential for sudden or uncontrolled motion may pose a safety hazard or cause damage to the machinery.
Sprags can be manually activated or automatically engaged when certain conditions are met. They are commonly used in heavy-duty applications, such as mining, construction, and maritime industries, where the precise control of rotational movement is essential. Due to their robust design and reliability, sprags are often preferred over other braking mechanisms in situations where extreme forces or heavy loads need to be managed effectively.
• A young salmon.
• A young salmon; a rough stout bar of wood.
• To stop a waggon by putting a strong bar of wood between two spokes of a wheel.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "sprag" has a somewhat uncertain etymology. It can be traced back to Old Norse, where the word "sprengja" meant "to spring, leap", or "to break". This Old Norse root is related to the modern English word "spring".
The term "sprag" itself specifically refers to a metal or wooden device used to block or hold the wheels of a vehicle or machine, particularly in mining or railway contexts. The origin of this specific usage is unclear, but it likely evolved from the earlier sense of "springing" or "breaking" by the action of blocking or preventing something from moving or running away.
It's important to note that "sprag" can also have other meanings. For example, in some dialects, it can refer to a young fish. However, the etymology of these alternative meanings may be different from the one described above.
