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Benchmade 18040S Undercurrent Fixed Blade Knife
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$250.00
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SKU: WX2*0740756
Overview
Built for demanding work around water, this fixed blade is aimed at anglers, boaters, and hunters who need a dependable utility knife in corrosive environments. Its partially serrated sheepsfoot blade is suited to cutting line, rope, and bait, while the full-tang construction adds confidence for hard-use tasks. The Santoprene polymer handle and molded sheath support practical carry and storage, making it a straightforward choice for field, dock, or camp use. It is a purpose-driven tool with a premium steel choice, but its design is clearly focused on utility rather than general-purpose elegance.
Why Hunters Choose the Benchmade
Cpm-magnacut Steel
Is specified for high toughness,
Partially Serrated
Sheepsfoot blade is designed for
Water Class
Design targets boating, fishing, cooking,
Full Tang
Construction adds strength for hard-use
Includes Molded
Sheath for convenient carry and
Key Features
- Benchmade Water Class knife designed for boating, fishing, cooking, and camping use.
- CPM-MagnaCut steel blade with high toughness, wear resistance, and corrosion resistance.
- 4.32-inch partially serrated sheepsfoot blade with stonewash finish.
- Partially serrated edge helps saw through lines, rope, and bait.
- Santoprene polymer handle with full tang strength.
- Includes molded sheath for carry and storage.
Best Used For
- Boaters and anglers needing a hard-use knife for lines, rope, and bait tasks.
- Hunters who want a utility fixed blade for camp chores near water.
- Outdoor users working in saltwater environments where corrosion resistance matters.
- Users preferring a partially serrated sheepsfoot blade for dependable cutting versatility.
- Carry-focused buyers who want molded sheath storage for boat, pack, or camp use.
Specifications
| Blade Finish | Stonewash |
|---|---|
| Blade Length | 4.32 in |
| Blade Steel | CPM MagnaCut |
| Blade Style | Sheepsfoot |
| Country Of Origin | USA |
| Edge Type | Partially-serrated |
| Handle Material | Santoprene polymer |
| Sharpening And Maintenance | Lifesharp lifetime sharpening and maintenance |
| Sheath | Molded sheath |
| Tang | Full tang |
| Warranty | Benchmade limited Lifetime Warranty |
Pros
- CPM-MagnaCut steel is specified for high toughness, wear resistance, and corrosion resistance.
- Partially serrated sheepsfoot blade is designed for cutting lines, rope, and bait.
- Water Class design targets boating, fishing, cooking, and camping use.
- Full tang construction adds strength for hard-use utility tasks.
- Includes molded sheath for convenient carry and storage.
- Backed by Benchmade limited lifetime warranty and Lifesharp sharpening and maintenance.
Considerations & Trade-offs
- The partially-serrated blade is geared toward lines, rope, and bait, so it is less specialized for users who prefer a plain edge for finer slicing tasks.
- At 4.32 inches, the blade size may feel more task-focused than compact for hunters who want a smaller carry profile.
- The molded sheath supports carry and storage, but the provided details do not indicate a belt-specific or multi-position carry setup.
- This is a premium-priced fixed blade, so it makes the most sense for buyers who will use the Water Class features and MagnaCut performance regularly.
Suggested Comparisons
- Fixed blade utility knife
- Saltwater/fishing knife
- Camping and boating knife
- Partially serrated outdoor knife
Suggested Accessories
- Knife sheath
- Knife sharpener
- Cut-resistant gloves
- Utility lanyard
Frequently Asked Questions
What is the Benchmade 18040S Undercurrent designed for?
It is part of Benchmade’s Water Class and is described as a hard-use utility multitasker for boating, fishing, cooking, camping, and other on- or off-water tasks.
Does the Undercurrent have a serrated edge?
Yes. The long description says it has a partially-serrated blade intended to quickly and dependably saw through lines, rope, and bait.
What steel does this knife use?
The product data lists CPM-MagnaCut steel and describes MagnaCut as a material with high toughness, high wear resistance, and high corrosion-resistance.
What comes with the knife for carry and storage?
The product includes a molded sheath for easy carry and storage.
Is there any warranty or maintenance support included?
Yes. The product data says it includes Benchmade’s limited Lifetime Warranty and Lifesharp lifetime sharpening and maintenance.