The ProTech TR-4 4" Black Plain Edge with Safety TR-4.3 D2 is a robust and feature-rich automatic knife from ProTech’s TR-4 series. This model combines a larger 4-inch black blade with a clean plain edge and an integrated safety mechanism, making it one of the most capable and secure automatic knives in the ProTech lineup.
Why Choose the ProTech TR-4.3 D2?
ProTech Knives is widely recognized as a leading American manufacturer of premium automatic knives. The TR-4 series was developed as a larger, more substantial platform than the TR-3, offering increased blade length and strength for users who need more cutting power. The TR-4.3 D2 model stands out with its 4-inch blade made from D2 tool steel, a black finish, and a built-in safety lock. D2 steel is known for its excellent wear resistance and edge retention, making it a popular choice for hard-use knives. The addition of a safety mechanism provides extra security against accidental deployment, which is especially important on larger automatic knives. The all-black configuration gives the knife a tactical, low-profile appearance suitable for professional and everyday carry use.
Key Features of the ProTech TR-4.3 D2
- 4-Inch Black Blade – Larger blade size made from D2 tool steel with a durable black coating
- Plain Edge – Clean plain edge for precise and versatile cutting performance
- Built-in Safety Lock – Integrated safety mechanism prevents accidental blade deployment
- Automatic Deployment – Fast and reliable push-button automatic opening mechanism
- D2 Tool Steel – High-carbon, high-chromium steel known for excellent edge retention and wear resistance
- 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 TR-4.3 D2 – Official ProTech TR-4 configuration with safety and D2 steel
Performance and Build Quality
The ProTech TR-4 4" Black Plain Edge with Safety TR-4.3 D2 delivers strong and reliable performance in a well-engineered automatic knife. The 4-inch D2 steel blade provides excellent cutting power and edge retention, making it suitable for demanding tasks. The black blade coating helps reduce glare and offers additional protection against corrosion. The integrated safety lock is a key feature, allowing users to carry the knife with confidence by preventing unintentional activation of the automatic mechanism. The automatic deployment is smooth and consistent, while the larger TR-4 handle offers a secure and comfortable grip. ProTech’s precision manufacturing ensures tight tolerances, smooth action, and a solid lockup. This model is particularly well-suited for users who want a larger automatic knife with enhanced safety features and the durability of D2 tool steel.
Technical Specifications
| Product Name | ProTech TR-4 Automatic Knife |
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| Model Number | TR-4.3 D2 |
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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 | Plain Edge |
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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, Everyday Carry, Collection, Professional Applications |
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| Key Benefit | 4-inch D2 steel automatic knife with safety lock and black finish |
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Experience the power and safety of the ProTech TR-4.
The ProTech TR-4.3 D2 combines a 4-inch D2 steel blade with a built-in safety mechanism in an all-black tactical design.
The TR-4 BL/PL BLACK W/SAFETY 4" TR-4.3 D2 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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