OTF Automatic Knife – 3.5″ Blade, 9″ Overall, Single Edge

When your other hand is occupied — managing a door, steadying a patient, holding a flashlight — fumbling with a thumb stud is not an option. The OTF Automatic Knife addresses that specific problem. One button drives the 3.5-inch single-edge blade straight out the front of the handle and locks it in position. When you’re done, one more press retracts it. The mechanism doesn’t ask anything of your grip hand.

Who This Knife Is For

Security personnel, first responders, tradespeople, and experienced EDC carriers who need single-handed blade deployment under real working conditions. Not a novelty. Not a range toy. If your work or your environment regularly puts something in one hand while the other needs a cutting tool, this is the design that solves that problem. It also suits collectors who understand OTF mechanics and want a heavy-duty example at a practical price point.

Is It the Right Fit for You?

Choose It If You Want

• True one-handed deployment without a thumb stud or wrist flick
• A full-grip handle at 5.5 inches collapsed — substantial in hand, not a keychain piece
• A single-edge blade that reduces snag points during both deployment and carry
• A fixed, locked blade when open — no liner flex, no play

Consider Another Option If You Need

• A shorter collapsed length — a compact manual folder will carry smaller
• Simpler long-term maintenance — a fixed blade has no spring mechanism to service
• Legal simplicity — automatic knives face restrictions in many jurisdictions where manual folders do not

OTF Automatic Knife Features and Benefits

• Out-the-front deployment: Single button press drives the blade forward and locks it — no two-handed manipulation required
• 3.5-inch single-edge blade: Long enough for utility work, short enough to carry without bulk; single edge reduces snag on deployment and storage
• 9-inch overall length: Full-size grip provides control and reach; 5.5-inch collapsed length keeps it manageable in a pocket or on a belt
• Heavy-duty construction: Built to handle regular professional use, not occasional weekend carry
• Spring-loaded mechanism: Consistent deployment pressure across use conditions
• 0.7 lb weight: Substantial enough to feel solid in hand without adding meaningful carry weight
• Retraction by second button press: Full ambidextrous control — open and close without changing your grip

How the OTF Automatic Knife Compares

Three carry options solve the one-hand blade problem differently. Here’s where they stand.

Care and What’s Included

What’s in the Box

The OTF Automatic Knife. Review included maintenance guidelines before extended use.

Mechanism Care

Spring-loaded OTF mechanisms benefit from periodic light lubrication at the blade track and deployment channel. Avoid repeatedly actuating the mechanism without purpose — unnecessary cycling adds wear without benefit. Keep the channel clear of debris, particularly if you carry in dusty or sandy environments. A clean mechanism is a reliable mechanism.

Legal Notes

Automatic knives are legal to own and carry in many US states, but a significant number of states, cities, and venues restrict or prohibit them — sometimes regardless of blade length. Laws in this category change, and local ordinances can differ from state law. Verify your specific jurisdiction’s rules before purchasing or carrying this knife. This is not legal advice.

OTF Automatic Knife: Frequently Asked Questions

How does the OTF Automatic Knife deploy and retract?

Pressing the deployment button releases spring tension that drives the blade straight out the front of the handle, where it locks in position. A second press of the same button — or a dedicated retraction button, depending on the design — pulls the blade back into the handle. The mechanism operates independently of grip pressure, so it functions the same whether you’re holding lightly or firmly.

What are the exact dimensions of the OTF Automatic Knife?

The blade measures 3.5 inches. Overall open length is 9 inches. Collapsed length is 5.5 inches. The handle measures 1.25 inches wide. Total weight is 0.7 lbs. Those numbers put it in full-size territory — this is not a compact carry piece, and it isn’t trying to be.

How do I maintain the spring mechanism?

Keep the blade track and deployment channel lightly lubricated and free of grit. Don’t repeatedly cycle the mechanism for demonstration purposes — spring components wear with actuation, and unnecessary repetition shortens service life. Follow the included maintenance guidelines for specifics on lubrication type and frequency.

Is the OTF Automatic Knife legal where I live?

Automatic knives occupy a complicated legal space in the US. They’re permitted in many states but restricted or banned in others, and local ordinances sometimes impose stricter rules than state law. Blade length thresholds vary. Before purchasing or carrying this knife, check your state statutes and any applicable local laws. Laws change, so verify current rules rather than relying on older sources.

Add This Knife to Your Carry Setup

The OTF Automatic Knife is a purpose-built tool for buyers who understand what one-handed deployment actually means in practice. At $69.95, it’s priced for working use, not shelf display. Confirm it’s legal in your jurisdiction, then add it to your cart.