Zinc Alloy Safety Knife 18mm High Carbon Steel Blade Gravity Utility Knife
Description
It is heavy duty gravity utility knife engineered for precision, durability, and safety, ideal for professionals and DIY enthusiasts tackling tough cutting tasks. Produced from premium zinc alloy comfortable hand reduces fatigue during extended work.18mm high carbon steel blade is sharp, corrosion-resistant, stay sharp longer than standard blades. It cut through thick materials (cardboard, rubber, drywall, vinyl) with clean, efficient cuts, no jagged edges.
For convenience, it includes a built-in compartment storing 3 spare blades, so you never run out of sharp edges mid-task. Compact yet heavy-duty, this safety knife combines zinc alloy’s sturdiness with high carbon steel’s cutting power, making it a reliable tool for both work sites and home projects.
Production information
Blade: High carbon steel, good hardness and sharp blade
Blade replacement switch: One click to change the blade
Head: Zinc alloy, strength and corrosion resistance, ensuring durability.
Handle: Zinc alloy+TPR material, non-slip grip, it is durable and comfortable.
| Item number | FT-818X | Brand name | Fulgent |
| Blade material | SK5 High carbon steel | Knife material | Zinc alloy+ABS+TPR |
| Blade size | 61x19x0.6mm | Blade Quantity | 1+3pcs/knife |
| Knife size | 170X30X20mm | knife Weight | 180.7g |
| Product name | Safety knife | OEM/ODM | Available |
| Sample service | Free sample | Original | NingBo,China |
| Package | Blister packing | Blade style | Trapezoidal Blade |
| Certificate | BSCI,ISO,CE,ROHS | Delivery time | 30day to 45days |

Blade Replacement
Prepare Your Space: Use a container for the old blade.
Unlock the Blade: Release the lock to free the blade from the handle.
Remove the Old SK5 Blade: Pull the blade out. Handle by the dull edge—SK5 steel is sharp!
Insert the New SK5 Blade: Align with the handle’s mechanism, slide in until it locks securely.
Test Stability: Extend and retract to check the lock. Ensure no wobbling.
FAQ
1. How does the gravity mechanism work for blade extension/retraction?
Tip the knife downward (gravity-activated) to extend the 18mm blade.When the knife is leveled, set down, or not in use, the blade retracts automatically.
2. What makes the 18mm High Carbon Steel Blade special?
High carbon steel offers superior sharpness retention and corrosion resistance. The 18mm width handles wider cuts, making it ideal for thick materials like drywall or cardboard.
3. Where are the 3 spare blades stored, and how do I access them?
The 3 spare blades are stored in a built-in compartment in the zinc alloy handle. Access it via a simple slide or snap-open design.
4. Is the zinc alloy build durable enough for heavy-duty use?
Yes. Zinc alloy is impact-resistant, scratch-resistant, and withstands daily rough use without cracking, perfect for heavy-duty tasks.
5. What type of blades does it use, and are replacements easy to find?
It uses standard 18mm utility blades, which are widely available at hardware stores, online retailers, and tool shops.
6. Is this knife safe for beginners to use?
Yes. The gravity activated auto-retract feature minimizes accidental cuts, and the zinc alloy handle provides a secure grip.