The ProTech TR-4 4" Black Partially Serrated with Safety TR4.4D2 is a high-performance tactical automatic knife from ProTech’s robust TR-4 series. This model features a 4-inch black-coated D2 steel blade with a partially serrated edge and an integrated safety mechanism, delivering exceptional cutting versatility and added security in a larger, more capable automatic knife.
Why Choose the ProTech TR-4.4D2?
ProTech Knives is one of the most respected American manufacturers of premium automatic knives. The TR-4 series was developed as a larger and stronger platform than the TR-3, offering increased blade length and durability for users who require more cutting power. The TR4.4D2 model stands out with its combination of a 4-inch D2 tool steel blade, partially serrated edge, and built-in safety lock. D2 steel is highly regarded for its excellent edge retention and wear resistance, making it ideal for hard-use applications. The partially serrated edge provides superior cutting performance on both fibrous materials and general tasks, while the safety mechanism prevents accidental deployment. The all-black finish gives the knife a professional, low-profile tactical appearance suitable for law enforcement, military, and serious everyday carry users.
Key Features of the ProTech TR-4.4D2
- 4-Inch Black Blade – Large D2 tool steel blade with a durable black coating for reduced glare and corrosion resistance
- Partially Serrated Edge – Combination serrated and plain edge for maximum cutting versatility
- Built-in Safety Lock – Integrated safety mechanism prevents accidental blade deployment
- D2 Tool Steel – High-carbon, high-chromium steel known for outstanding edge retention and toughness
- Automatic Deployment – Fast and reliable push-button automatic opening mechanism
- All Black Finish – Black blade and handle for a discreet, tactical appearance
- Robust TR-4 Design – Larger and stronger handle for comfortable and secure grip
- Premium Build Quality – Made in the USA with tight tolerances and excellent fit and finish
- Model TR4.4D2 – Official ProTech TR-4 configuration with safety and partially serrated blade
Performance and Build Quality
The ProTech TR-4 4" Black Partially Serrated with Safety TR4.4D2 delivers powerful and reliable performance in a well-engineered automatic knife. The 4-inch D2 steel blade offers excellent edge retention and cutting strength, making it suitable for demanding tasks. The partially serrated edge significantly increases versatility, allowing the knife to efficiently cut through rope, webbing, cardboard, and other tough materials while still providing a plain edge section for clean, precise cuts. The integrated safety lock is a critical feature, giving users peace of mind by preventing unintentional activation of the blade. The automatic mechanism operates smoothly and consistently, while the larger TR-4 handle provides a secure and comfortable grip, even when wearing gloves. ProTech’s precision manufacturing ensures smooth action and a solid lockup, making this knife dependable for professional and everyday use.
Technical Specifications
| Product Name | ProTech TR-4 Automatic Knife |
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| Model Number | TR4.4D2 |
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| Blade Length | 4 inches |
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| Blade Steel | D2 Tool Steel |
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| Blade Finish | Black |
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| Blade Edge | Partially Serrated |
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| Safety Mechanism | Yes – Integrated Safety Lock |
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| Opening Mechanism | Automatic (Push Button) |
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| Handle Material | Aluminum |
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| Handle Color | Black |
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| Best For | Tactical Use, Law Enforcement, Everyday Carry, Collection |
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| Key Benefit | 4-inch D2 steel automatic knife with partially serrated blade and safety lock |
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Experience the power and versatility of the ProTech TR-4.
The ProTech TR-4.4D2 combines a 4-inch D2 steel blade with a partially serrated edge and built-in safety mechanism.
The TR-4 BL/PS BLACK W/SAFETY 4" TR4.4D2 is an automatic knife. Automatic knives are regulated by federal, state, and local laws. It is the buyer’s responsibility to ensure compliance with all applicable laws before purchasing or possessing this product. This item is intended for lawful use only by qualified individuals.
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