Pentagon Elite II / PE18-ARC

Bead Blasted / Spear Point / Partially Serrated

  • The Arc-Lock
  • VG-10 Stainless Steel
  • Lifetime Warranty
Blade Shape Spear Point
Symmetrically-shaped blade with improved penetration and tip strength. Tip aligned at centerline. Blade Shape
Blade Steel Type 420
Handle Material Glass-Reinforced Nylon
A strong glass fiber-reinforced nylon. Abrasion and impact-resistant. Blade Handle Material
Handle Color Black
Locking Mechanism Arc-Lock
Uses a pivotal block to lock the blade and is ambidextrious Blade Locking Mechanism
Edge Type Partially Serrated
Offers the benefits of both straight and serrated edges in one blade. Blade Edge Type


The Pentagon series sets the policy for action. Designed as backup for military and law enforcement, the Pentagon is the first multipurpose, double-edged knife of its kind.

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Product Type Folding Knife
Finish Bead Blasted
Blade Shape Spear Point
Edge Type Partially Serrated
Blade Steel Type 420
Hardness Rc. 59-60
Overall Length 10.75"
Closed Length 5.75"
Product Weight 6.80 oz
Blade Length 5"
Blade Thickness 0.16"
Show Complete Specifications

A folding version of the Pentagon, the Pentagon Elite has all the benefits of its big brother as well as a bead blasted blade that reduces reflection. The stainless steel blade offers the instant choice between a serrated or beveled edge, giving you the best of both worlds for cutting virtually any material. Extremely lightweight, the Pentagon Elite features a glass-reinforced GRN handle with stainless steel liners that provides sensational feel and balance. Tested at over 1000 lbs. of force at the lock, the Arc-Lock is SOG’s strongest lock. It can be carried conveniently with its reversible low-carry pocket clip.

Full Spec

Full Specifications

US Standard | Metric

Overall Length 10.75" Closed Length 5.75"
Product Weight 6.80 oz Blade Length 5"
Blade Thickness 0.16" UPC 7-29857-00018-5
Product Type Folding Knife Country of Origin Japan
Locking Mechanism Arc-Lock Belt Clip Type Reversible
Packaging Presentation Box Engravable Yes
Finish Bead Blasted Edge Type Partially Serrated
Blade Steel Type 420 Blade Shape Spear Point
Handle Material Glass-Reinforced Nylon Handle Color Black
Hardness Rc. 59-60    


    The Arc-Lock

    The Arc-Lock

    With its ambidexterity - and all the other attributes knife enthusiasts so relentlessly seek - the Arc-Lock might just be the perfect lock.

    Tested at over 1000 lbs. of force (measured at the lock), far surpassing conventional lock strength.

    Lightning-quick, one-handed opening and closing capability.

    Spring-action securely retains blade closed, keeping fingers safely clear while unlocking.

    Self-adjusting over time and easily cleaned for long-term optimal performance.

    VG-10 Stainless Steel

    VG-10 Stainless Steel

    VG-10 is well-known high-end Japanese steel and is considered premium. It contains vanadium which is known for its toughness. The steel is specially designed for high-quality blades used in cutlery. VG-10 can be sharpened to a fine edge that is very durable. It can maintain a hardness of Rc 60 without becoming brittle.


Customer Ratings & Reviews

Pentagon Elite II is rated 4.5 out of 5 by 14.
Rated 5 out of 5 by from Best Knife Ever!!! My EDC knife for over 10 yrs. Lost 1st and bought another. Smooth open/close. Holds a decent edge but expect to sharpen weekly to hold a shavin edge
Date published: 2015-11-08
Rated 5 out of 5 by from Great Knife I cannot say enough about this knife. I have owned it for about for probably 10 years. I use it pretty much every day either at work, at home, on the ballfield or at the fire station. If I had 1 complaint it is that I cannot keep it sharp.
Date published: 2015-10-23
Rated 5 out of 5 by from easy to operate This is my EDC knife that I have had for nearly 5 years. It is very easy to open and close and the blade really holds an edge. In fact I have never had to sharpen it yet, but I don't open letters or boxes and the like. This is my go to knife.
Date published: 2015-10-22
Rated 5 out of 5 by from The Best, & Unique ! As a senior citizen, I've had many knives ,through the years. It's lightweight, & I keep in within reach at all times,(24/7). With the 5" blade, & superior design,& construction, it's much more practical than carrying a sidearm everywhere I go. It's the best, & unique !
Date published: 2015-10-09
Rated 4 out of 5 by from Great Knife! I have owned this knife for about 8 years now and it has withstood everything I can throw at it. From everyday carry and small jobs, to dressing big game, it has been an incredible, durable tool through it all. It holds an edge well. I also like how the pocket clip can be configured for different carry styles. At first, I didn't like the non-assisted blade, but the action is so smooth, so the blade swings out with just a flick of the wrist. I own several SOG (and other brand) knives and this one is among my favorites.
Date published: 2015-07-30
Rated 5 out of 5 by from Best duty knife I have had this knife for over a year and it has performed well on duty. It carries easily in my vest and is sharp enough it makes easy work of seatbelts. Plenty of leverage thanks to its length. Best factory knife I own!
Date published: 2015-07-19
Rated 5 out of 5 by from Really Tough knife! I was cutting the grass and it fell out of my pocket ,i found it three weeks later still in the wet grass "I live in √Čire, it always rains here", NOT ONE speck of rust on the blade ,It's my EDC knife and i can't say enough good things about it .....
Date published: 2015-05-02
Rated 5 out of 5 by from great edge, grip, serration this is a great blade, grip, well thought out clip, grip, and the blade is well designed. it is one of the more long blades i use on a regular bases. the shark tip is a nice feature.
Date published: 2014-11-15
  • 2015-11-26T07:55CST
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    SOG Warranty Information

    All SOG products are guaranteed against defects in workmanship and materials for the life of the original purchaser. This guarantee is voided (as determined by SOG) by misuse, abuse, improper maintenance, or alterations of the product and does not cover any normal wear or tear that might occur. Using your SOG folding blade or fixed blade knife for any purpose other than cutting or puncturing is considered abuse and may void your warranty.

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    Guarantee Claims

    All guarantee claims should be directed to the factory. U.S. claims should be sent prepaid and insured. For international claims: call, write, or email SOG's Warranty Dept. for information.

    We are not responsible for lost or stolen packages that do not arrive to our facility.

    SOG reserves the right to the repair or replacement of a product at our discretion. Products that are discontinued and not repairable will be replaced with a gift certificate of the last MSRP value, as determined by SOG, which can be used for a future purchase.

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    Examples of Non-Warranted Items

    Rusted/spotted/stained blades or handles (coated or not), broken or bent knife tips, worn tool components, dull/chipped knife blades, scratched blade/tool coatings, worn/loose Kraton slabs, sheaths and pouches (if brand new sheaths are determined to be defective they are replaced separately from the knife/tool), and broken/lost thumb studs.

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    SOG Unconditional Pocket Clip Warranty

    Pocket clips can be broken if they are accidentally caught on foreign objects while wearing. To help prevent such occurrences, SOG recommends that you wear your knife in your front pocket, with the knife inside your pocket. If, for whatever reason, your clip bends or breaks and you would like to receive a replacement, fill out the Clip Request Form, or email/call SOG's warranty department. Damage to a knife handle because a clip has snagged is not considered "normal," and any such damage will be assessed under warranty. Learn more about replacing pocket clips in Knife & Tool Care.

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    SOG offers a sharpening service for our products at the minimal charge of $12.00

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    Broken Blades

    In the unlikely case that your knife blade breaks, we will do a hardness test on it to see if it is within specs and therefore eligible for replacement.

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    SOG will pre-determine the cost of repair or replacement of non-warranted items and communicate the estimated cost to the customer before any work is performed.

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    Returning a product for replacement

    Include a brief note inside your package stating what you are returning, the claimed defect and how it failed. Also, include inside the package, your name, address, daytime phone number and email address to reach you in case we have any questions.

    If the item has sentimental value, please state that in the note. In some cases, items are replaced.

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    Warranty claim address & contact information

    SOG Specialty Knives, LLC.
    Attn: Warranty Dept.
    6521 212th St SW
    Lynnwood, WA 98036

    For any other questions, either call, fax, or email SOG’S warranty department at

    Phone: 425-771-6230
    Toll Free: 1-888-40-KNIFE (405-6433)
    Fax: 425-771-7689
    Email: warranty[at]

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