SOG Pentagon Auto OTF Spear Point Knife - 3.79" CPM S35VN Blade, Black TiNi Finish, Blackout Aluminum Handle, Pocket Clip

The SOG Pentagon Auto OTF Spear Point Knife is a purpose-built automatic designed for users who demand fast, reliable one-handed deployment in the field or on duty. Built on SOG's Dynamic Lock-up System, this OTF knife combines proven switchblade mechanics with genuine materials: a 3.79" CPM S35VN blade finished in Black Titanium Nitride and a blackout aluminum handle built to last. Whether you're a working professional, outdoor enthusiast, or serious collector, the Pentagon delivers the kind of dependable performance you need when seconds matter.

The spear-point blade profile offers a versatile edge geometry that works equally well for utility cuts, field dressing, or tactical applications. At 6.7 ounces with a closed length of just over 4 inches, it rides compact in your pocket thanks to the integrated clip while still opening to a functional 9.08" overall length. The aluminum handle won't corrode or add unnecessary weight, and the straight edge comes sharp and ready to work out of the box.

What sets the Pentagon apart in the crowded OTF market is SOG's engineering philosophy: this isn't a novelty item designed for flash, it's a blade built for the hand that deploys it repeatedly under real conditions. American-made construction and premium steel like S35VN signal that SOG isn't cutting corners on this one. The Dynamic Lock-up System is the mechanical backbone—designed to handle blade lock-up strength and open reliability without the slop or play you'll find in cheaper imports.

Key Features

• CPM S35VN stainless steel blade with Black Titanium Nitride finish for corrosion resistance and durability
• Dynamic Lock-up System for secure blade lock and reliable one-handed deployment
• Spear-point blade profile—versatile for utility, field, and tactical use
• Compact closed length (4.06") with integrated pocket clip for everyday carry
• Blackout anodized aluminum handle—lightweight, durable, and low-profile
• American-made construction by SOG
• Straight edge, ready to work

Specifications

Frequently Asked Questions

What is the blade steel and how does it perform?

The Pentagon uses CPM S35VN, a premium stainless steel known for excellent corrosion resistance, edge retention, and ease of sharpening. The Black Titanium Nitride finish adds an extra layer of protection against rust and wear. S35VN is a solid choice for working knives in outdoor, maritime, and field environments where stainless properties matter.

Is this knife legal to carry?

OTF automatic knives are legal to own in many states, but laws vary significantly by jurisdiction—some states prohibit them entirely, others restrict blade length or ownership by certain professions. Check your local and state laws before purchasing. Bosque Outdoors sells only to compliant jurisdictions; review your area's regulations before checkout.

What is the Dynamic Lock-up System?

SOG's Dynamic Lock-up System is their proprietary locking mechanism engineered to provide secure blade lock-up and reliable one-handed deployment in OTF knives. It's designed to eliminate play and keep the blade locked firmly during use, a key differentiator in OTF knife design.

Does it come with a pocket clip?

Yes, the Pentagon includes an integrated pocket clip for secure everyday carry. The clip is designed to keep the knife stable and accessible at a closed length of just over 4 inches.