Product Specification :
An Adjustable Wrench (commonly referred to as a Crescent wrench) is an open-end wrench with a movable jaw. Its primary advantage is versatility, allowing a single tool to fit a wide range of fastener sizes by adjusting the width of the jaw opening via an integrated screw mechanism.
1. General Characteristics
- Design: Features one fixed jaw and one sliding jaw adjusted by a knurled worm screw.
- Head Angle: Usually set at a 15° angle to the handle, allowing for a greater range of movement in confined spaces by flipping the wrench.
- Measurement Scales: Most modern versions include laser-etched scales (Metric and SAE) on the head for quick pre-setting to a specific fastener size.
2. Material & Construction
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Feature
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Specification
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Material
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Chrome Vanadium Steel (Cr-V) or Alloy Tool Steel.
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Core Process
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Drop-forged and heat-treated for maximum toughness.
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Finish
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Chrome-plated (rust resistance), Black Oxide (industrial/anti-glare), or Nickel finish.
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Grip Type
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Bare steel (I-beam design) or Ergonomic Bi-material / Dip-insulated handles.
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3. Key Technical Components
- Worm Screw: Precision-machined for smooth adjustment and to prevent "jaw creep" under load.
- Jaw Capacity: Varies by tool length.
- Example: A standard 250mm (10") wrench typically has a max jaw opening of roughly 30mm to 33mm.
- Jaw Thickness: Tapered toward the tip to allow access to nuts in narrow clearances.
4. Performance & Usage Standards
- Compliance: Usually manufactured to ISO 6787 or ASME B107.100 standards.
- Load Direction: For maximum tool life and safety, force should always be applied toward the fixed jaw.
- Backlash: High-quality specifications require minimal "play" or wiggle in the movable jaw to ensure a tight grip and prevent rounding of corners.
5. Common Sizes
Adjustable wrenches are categorized by their overall handle length, which dictates their leverage and jaw capacity:
- Small (100mm - 150mm / 4" - 6"): Precision work, electronics, and bicycles.
- Medium (200mm - 300mm / 8" - 12"): General automotive and household plumbing.
- Large (375mm - 600mm+ / 15" - 24"+): Heavy industrial use and large-diameter piping.
