Benchmade Boost 591BK – 3.43" Black Cerakote CPM-3V Assisted Opening Utility Folding Knife
The Benchmade Boost 591BK is the hard use member of the Boost family, built for first responders and work duty rather than pure EDC slicing. Its 3.43" CPM-3V blade wears a black Cerakote finish and uses an opposing bevel grind with a blunt pry tip, so the knife can scrape, pry, and drive through abusive jobs that would snap a fine point. The AXIS Assist mechanism with integrated safety opens it fast with one hand, and the black and red dual durometer Versaflex handle stays grippy in gloves or wet conditions. Benchmade has discontinued the Boost line, and this page stays current for owners and collectors. Going Gear is an authorized Benchmade dealer.
Benchmade Boost 591BK Specifications
| Specification |
Detail |
| Brand |
Benchmade |
| Model |
Boost 591BK |
| SKU |
BEN-591BK |
| Blade Length |
3.43" |
| Blade Steel |
CPM-3V tool steel, 58-60 HRC |
| Blade Finish |
Black Cerakote |
| Blade Style |
Opposing bevel with blunt pry tip |
| Blade Thickness |
0.120" |
| Overall Length |
8.26" |
| Closed Length |
4.83" |
| Weight |
4.49 oz |
| Handle Material |
Black and red dual durometer Versaflex |
| Lock Type |
AXIS Assist with safety |
| Made In |
USA (Oregon City, Oregon) |
| Knife Type |
Folding knife |
Frequently Asked Questions
What kind of blade does the Benchmade Boost 591BK have?
The Benchmade Boost 591BK (BEN-591BK) has a 3.43" black Cerakote CPM-3V blade with an opposing bevel grind and a blunt pry tip. The tip is deliberately squared off so the knife can pry, scrape, and pop staples or clips without risking a snapped point, which is why the 591BK is often described as a rescue and utility folder.
Is CPM-3V stainless steel?
No. The CPM-3V in the Benchmade Boost 591BK is a high toughness tool steel, not a stainless steel. It shrugs off impacts and prying that would chip most stainless blades, but it can rust if neglected. Wipe the blade dry after use, keep a light coat of oil on it, and the Cerakote coating will protect everything but the edge itself.
What is the blade length of the Benchmade Boost 591BK?
The Benchmade Boost 591BK has a 3.43" blade, an 8.26" overall length, and weighs 4.49 oz with its deep carry reversible pocket clip.
Is the Benchmade Boost 591BK an automatic knife?
No. The Benchmade Boost 591BK is an assisted opening knife. Its AXIS Assist mechanism finishes opening the blade after you start it manually, and an integrated safety locks it shut. Assisted knives are legal in more places than automatics, but rules vary, so check your local laws.
What handle does the Benchmade Boost 591BK use?
The Benchmade Boost 591BK uses a black and red dual durometer Versaflex handle. A rigid core carries the mechanism while a softer overmold cushions impact and grips securely in wet or gloved hands, a signature feature of the Benchmade Boost line.
Does LifeSharp cover the Benchmade Boost 591BK?
Yes. Benchmade's LifeSharp lifetime service covers the Benchmade Boost 591BK even though the model is discontinued. Benchmade will clean, adjust, and resharpen the knife at the factory for free.
Where can I buy the Benchmade Boost 591BK?
The Benchmade Boost 591BK is discontinued, so remaining examples come from leftover dealer stock and the secondary market. Going Gear is an authorized Benchmade dealer and carries Benchmade's current utility and rescue oriented folders.
