screw jack
C1Technical / Specialised
Definition
Meaning
A mechanical device used for lifting heavy loads through the rotation of a screw mechanism.
A portable lifting device where the vertical movement is achieved by turning a lead screw; often used in automotive repair, construction, and engineering for precise, stable lifting.
Linguistics
Semantic Notes
Primarily a technical compound noun. The term is highly specific to mechanical/engineering contexts. It denotes a tool, not an action or abstract concept.
Dialectal Variation
British vs American Usage
Differences
Term is identical in both varieties. The component words 'screw' and 'jack' have the same technical meaning. Spelling is consistent.
Connotations
Neutral technical tool in both. No significant connotative difference.
Frequency
Equally low-frequency and specialised in both dialects. Familiar mainly to those in mechanical, automotive, or engineering fields.
Vocabulary
Collocations
Grammar
Valency Patterns
[Subject] used/operated a screw jack to [Verb] the [Object].The [Object] was lifted/raised/supported by a screw jack.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None. This is a purely technical term.”
Usage
Context Usage
Business
Rare, except in procurement or sales for industrial/automotive equipment.
Academic
Used in engineering, physics, or vocational textbooks and papers discussing mechanics, force, and simple machines.
Everyday
Very rare. Might be used by DIY enthusiasts or car owners discussing tools.
Technical
Core usage. Common in manuals, engineering designs, automotive repair, and construction contexts.
Examples
By Part of Speech
verb
British English
- We need to screw-jack the beam into place. (Non-standard/rare)
American English
- They attempted to screw jack the trailer. (Non-standard/rare)
adjective
British English
- The screw-jack mechanism was seized. (Hyphenated attributive use)
American English
- We inspected the screw jack system. (Compound noun used attributively)
Examples
By CEFR Level
- The mechanic used a screw jack to lift the car.
- For precise levelling of the machinery, a mechanical screw jack is preferable to a hydraulic one.
- The structural engineer specified a system of synchronised screw jacks to facilitate the gradual raising of the heritage building's foundation.
Learning
Memory Aids
Mnemonic
Think of 'screwing' a lid off a jar to raise it; a 'screw jack' 'screws' to raise a car or beam.
Conceptual Metaphor
TOOL FOR LIFTING IS A SCREW. (The abstract concept of controlled vertical movement is metaphorically mapped onto the physical action of a screw thread.)
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation as 'винтовой Джек' (name). Correct is 'винтовой домкрат'.
- Do not confuse with 'jack' as a name or electrical 'jack' (разъём).
- Not related to 'screw' as a verb meaning to fasten or cheat.
Common Mistakes
- Misspelling as 'screwjack' (one word is less common).
- Confusing it with a 'bottle jack' or 'floor jack' (different internal mechanisms).
- Using it as a verb (e.g., 'He screw-jacked the car' is non-standard).
Practice
Quiz
What is the primary advantage of a screw jack over some other lifting devices?
FAQ
Frequently Asked Questions
It is a type of car jack. Many common car jacks (like scissor jacks) are screw jacks, using a screw mechanism. However, 'car jack' is a broader term that can include hydraulic or pneumatic jacks.
No, it is a noun. The verb form is not standard English. You would say 'lift with a screw jack' or 'jack up using a screw jack'.
Automotive repair, construction, stage/theatre rigging, manufacturing, and any engineering field requiring precise vertical positioning of heavy loads.
A screw jack uses a mechanical screw thread for lifting, offering precision and stability without fluid. A hydraulic jack uses pressurized fluid (oil) in a cylinder, often allowing for easier lifting of heavier weights with less manual effort.