SOG Pentagon FX – 4.77" Fixed Blade, Spear Point, Straight Edge
CPM S35VN Stainless Steel • Black Titanium Nitride Finish • Textured G10 Handle • Nylon Sheath Included
Model: SOG-17-61-01-57 / SOG17610157 • UPC: 729857011501
Purpose-built for control, durability, and confident carry, the SOG Knives & Tools Pentagon FX is a premium fixed blade that excels in field, duty, and everyday utility roles. Its 4.77-inch spear-point blade is ground from CPM S35VN—a top-tier powder metallurgy steel known for excellent edge retention, corrosion resistance, and toughness. A stealthy Black Titanium Nitride (TiNi) finish adds wear protection and reduces glare, while the textured G10 handle locks into your hand in wet, cold, or gloved conditions. A rugged nylon sheath rounds out the kit with secure retention and multiple mounting options so you can carry with confidence on belts, packs, or vests.
If you want a hard-use fixed blade with modern materials and mission-ready ergonomics, the Pentagon FX is built to deliver—day in, day out.
Why the SOG Pentagon FX Stands Out
Premium CPM S35VN Steel
Powder metallurgy composition with niobium and vanadium carbides gives long-lasting sharpness, chip resistance, and stellar corrosion resistance—ideal for heavy use and variable climates.
Black TiNi Protective Finish
The Titanium Nitride coating increases abrasion resistance and reduces reflection, protecting the blade while keeping your profile low.
Spear-Point, Straight Edge Control
A symmetrical spear-point profile centers the tip for precise thrusts and detailed work, while a plain (straight) edge delivers clean, predictable slicing and easy field sharpening.
Grip-Secure G10 Scales
Glass-fiber laminate (G10) scales are machined for texture and contour, giving you a non-slip, hand-filling hold without excess bulk.
Carry-Ready Nylon Sheath
The included nylon sheath provides positive retention, quiet carry, and flexible mounting orientations for belt or pack.
Key Specifications
Brand / Series: SOG Knives & Tools — Pentagon FX
Model / UPC: SOG-17-61-01-57 / SOG17610157 • 729857011501
Blade Length: 4.77 inches
Blade Steel: CPM S35VN stainless
Blade Style: Spear point
Edge Type: Straight (plain) edge
Finish: Black Titanium Nitride (TiNi)
Handle Material: Textured G10, black
Sheath: Black nylon, retention strap, multi-mount capability
Colorway: Black blade, black handle
Use Cases: Duty/field, rescue/utility, camping/overlanding, EDC fixed-blade tasks*
*Always follow local laws regarding knife carry and blade length.
Performance You’ll Notice
Long-Running Edge
CPM S35VN holds working sharpness far longer than common steels, so you spend more time cutting and less time at the stone.
Confident Tip Control
The spear-point geometry centers mass at the tip for stable piercing and fine scoring, while the straight edge makes clean push cuts and easy maintenance.
Secure, All-Weather Grip
Aggressive G10 texture and palm-friendly contours ensure no-slip control—in rain, sweat, or winter gloves.
Low-Glare Durability
TiNi adds a protective layer that fights wear and corrosion, keeping your blade performing (and looking) its best.
Ideal Use Cases
Field & Duty Utility: Cutting cordage, webbing, plastic, and packaging; precise tip work.
Camping & Overlanding: Food prep, feather sticks, tent/strap trimming, general camp chores.
Rescue/First Response: Robust fixed blade with reliable retention and easy, one-handed access from the sheath.
Everyday Kit: A dependable, non-folding design that’s strong, quick to deploy, and easy to clean.
Carry & Setup Tips
Dial the Sheath: Mount vertically on belt or lash to a pack; test draw and re-sheath until it’s smooth and consistent.
Retention Check: Ensure the strap or molded insert secures the blade; adjust for your activity level.
Glove Test: Practice draws with work or cold-weather gloves to build real-world muscle memory.
Care & Maintenance
Clean & Dry: After exposure to moisture, salt, or acidic foods, rinse and dry the blade and sheath hardware.
Edge Work: Maintain the straight edge with ceramic or diamond stones; S35VN rewards consistent angles and light pressure.
Protective Film: Although corrosion-resistant, a thin coat of oil on the edge helps in humid or marine environments.
Sheath Hygiene: Brush out grit and let the nylon sheath air-dry if soaked to protect stitching and retention.
Frequently Asked Questions
Q: Why S35VN over other steels?
A: S35VN balances edge life, toughness, and corrosion resistance better than many mid-tier steels, and it sharpens more predictably than ultra-hard “super steels.”
Q: Is the nylon sheath configurable?
A: Yes—its mounting pattern supports multiple positions for belt or pack carry; set the angle for your dominant hand.
Q: Is the blade fully plain edge?
A: Correct—the Pentagon FX here features a straight (plain) edge for clean slicing and straightforward sharpening.
Q: Does the TiNi finish require special care?
A: No, just avoid harsh abrasives. Rinse, dry, and apply light oil at the edge as needed.
Q: Is this good for food prep?
A: Absolutely. Clean thoroughly after use and dry the blade to maintain the edge and finish.
SEO Highlights (Quick Scan)
SOG Pentagon FX fixed blade — 4.77" spear point, straight edge
CPM S35VN steel with black Titanium Nitride (TiNi) finish for durability and corrosion resistance
Textured G10 handle for secure, all-weather grip
Nylon sheath included • duty, field, and EDC-ready design
Model SOG-17-61-01-57 / SOG17610157, UPC 729857011501
The Bottom Line
The SOG Pentagon FX (SOG-17-61-01-57 / SOG17610157) combines a CPM S35VN spear-point blade, Black TiNi finish, and textured G10 ergonomics into a rugged, carry-ready package that thrives in the field and on the job. With its straight-edge precision, durable sheath, and low-profile finish, it’s the premium fixed blade you’ll trust when work gets real.
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