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The Taiwan Tiger Insulated Garden Shears (Model No. 640) are professional-grade pruning shears specifically engineered for safety and precision. Much like the 690, this model is a favorite in the Southeast Asian industrial and agricultural markets for its durability and specific safety features.
Product Overview
The "640" model is primarily a Bypass Pruner, meaning the blades overlap to create a clean, scissor-like cut. This is essential for live plants as it minimizes crushing the stem, allowing the plant to heal faster.
Technical Specifications
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Model Number: 640
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Blade Material: Hardened high-carbon steel, often finished with a polished or chrome coating to reduce friction and resist corrosion.
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Insulation: The handles are encased in thick, high-dielectric strength PVC or rubberized sleeves. This provides a safety barrier against accidental contact with live electrical wires (such as those for garden lighting or irrigation timers).
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Safety Lock: Features a robust metal or high-impact plastic tail-lock or thumb-slide to keep the blades closed during storage.
Key Features
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Ergonomic Grip: The insulation isn't just for safety; it also provides a cushioned, non-slip grip that absorbs some of the shock when cutting through tougher branches.
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Replaceable Spring: Typically utilizes a heavy-duty volute spring (v-shape) that ensures the shears pop back open quickly, reducing hand fatigue during high-volume pruning.
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Precision Tip: The 640 is known for having a slightly more tapered tip than heavier models, making it ideal for reaching into dense foliage or "deadheading" flowers.
Comparison: 640 vs. 690
While both models are "Insulated Garden Shears," the 640 is generally considered the "Standard Professional" size, whereas the 690 often features a slightly larger handle or different blade curvature for thicker woody stems.
Maintenance Recommendations
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Blade Care: After use, wipe away sap and moisture. Apply a light drop of machine oil to the center bolt to maintain smooth movement.
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Insulation Check: Always inspect the handle sleeves. If the insulation is cut or peeling, the tool should no longer be relied upon for electrical safety.
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Sharpening: Use a fine-grade diamond file or whetstone on the outer beveled edge of the cutting blade only. Do not sharpen the flat side of the bypass blade.