Benchmade Water Undercurrent Fixed Blade Dive Knife 4.32" CPM-MagnaCut Stonewashed Sheepsfoot Combo Blade, Depth Blue Santoprene Handle, Sonar Gray Injection Molded Sheath - 18040S

Benchmade Water Undercurrent Fixed Blade Dive Knife 4.32 inch CPM-MagnaCut Stonewashed Sheepsfoot Combo Blade, Depth Blue Santoprene Handle, Sonar Gray Injection Molded Sheath

* Pricing Info

$225.00

Read 2 reviewsWrite a Review

Qty:

Part #: BM18040S | Benchmade Knives

Out of Stock, but typically ships from KnifeCenter within 5-7 business days.

Ships for Free!

U.S. and Canada Shipping Only

Calculate Shipping

Save to Wishlist

Double Points Item!

Earn 4,500 knifeREWARDS Points!

Enough for a $10 KC Gift Card!

KnifeCenter.com: Authorized Benchmade Dealer

Save to Wishlist

Description

BM18040S: 18040S Undercurrent | Water Series

Benchmade Knives

The Undercurrent is your reliable fixed blade for hard use and utility while on the water. Featuring a sheepsfoot style blade made of CPM-MagnaCut steel with partial serrations for cutting lines, ropes, and bait, the Undercurrent is a cinch to clean compared to a folder for messier jobs. Complete with a Sonar Gray molded sheath that mounts on your belt, pack, or boat, with push button retention release for quick access.

Features

CPM-MagnaCut steel
Santoprene handle provides solid grip
White logo lasermark
Sheath included with push-button release

Specifications

Blade Length: 4.32" (10.98 cm)
Handle Length: 5.12" (12.99 cm)
Overall Length: 9.44" (23.97 cm)
Blade Material: CPM-MagnaCut Stainless Steel
Blade Thickness: 0.120" (3.05 mm)
Blade Hardness: 60-62HRC
Blade Style: Sheepsfoot
Blade Finish: Stonewash
Handle Material: Depth Blue Santoprene
Sheath Material: Sonar Gray Injection Molded with Thumb Release
Weight: 5.38 oz. (152.52 g)
Class: Water
Made in the USA

UPC Code: 610953207946

Related Categories

Benchmade Knives, Benchmade Water Series, MagnaCut Blade Steel, Zytel Handle Material, Fixed Blade Knives, Fixed Blade Knives Fish, Made in USA

Zytel Handles A nylon polymer that is lightweight and extremely durable, Zytel can be shaped and textured to provide excellent grip.

MagnaCut A revolution in powder-metallurgy, this is the first steel to combine high degrees of edge retention, toughness, and corrosion resistance all in one remarkable alloy.

Product Country of Origin Badge: Made in USA

Made in USA This product is USA born and raised.

(2 reviews)

5.0 out of 5 stars

5 star

4 star

3 star

2 star

1 star

Zoran
Be3lgrade, Serbia

Jan 14, 2026

Pros: Blade Material, Blade Sharpness, Finish, Handle Material, Materials, Overall Quality, Weight

Cons: Sheath/Scabbard

An excellent knife for an experienced diving instructor and fisherman

My son bought me your Undercurrent knife for my 70th birthday. The knife is great, but it's not convenient for attaching to my leg while diving. As an experienced dive instructor, I have an idea how this could be solved with a plastic attachment that would screw onto the existing sheath and have guides for the straps to secure it to the leg, as well as openings for a wide belt.

Stearns
North Carolina

Apr 25, 2024

Pros: Blade Material

Cons: None

Finally!

Finally, a dive knive with premium steel and build.