Benchmade Boost 590SBK – 3.70" Black CPM-S30V Combo Edge Assisted Opening Folding Knife
The Benchmade Boost 590SBK combines the two blade options of the full size Boost line, a 3.70" CPM-S30V drop point with a black coating and a partially serrated combo edge. The AXIS Assist mechanism with slide safety drives fast one hand opening, and the black Versaflex over gray Grivory dual durometer handle absorbs shock while locking the grip in place. Benchmade has discontinued the Boost line, and this page stays current for owners and collectors. Going Gear is an authorized Benchmade dealer.
Benchmade Boost 590SBK Specifications
| Specification |
Detail |
| Brand |
Benchmade |
| Model |
Boost 590SBK |
| SKU |
BCM-590SBK |
| Blade Length |
3.70" |
| Blade Steel |
CPM-S30V stainless, 58-60 HRC |
| Blade Finish |
Black coating |
| Blade Style |
Drop point, combo edge (partially serrated) |
| Blade Thickness |
0.120" |
| Overall Length |
8.52" |
| Closed Length |
4.83" |
| Weight |
4.59 oz |
| Handle Material |
Black Versaflex over dark gray Grivory, dual durometer |
| Lock Type |
AXIS Assist with slide safety |
| Made In |
USA (Oregon City, Oregon) |
| Knife Type |
Folding knife |
Frequently Asked Questions
What does SBK mean on the Benchmade Boost 590SBK?
On the Benchmade Boost 590SBK, S stands for serrated and BK for black blade. Both suffixes describe the blade, a black coated CPM-S30V drop point with a combo edge, on the same black and gray dual durometer handle as the rest of the Boost 590 family.
What is the blade length of the Benchmade Boost 590SBK?
The Benchmade Boost 590SBK (BCM-590SBK) has a 3.70" black coated CPM-S30V combo edge drop point blade, an 8.52" overall length, and a 4.59 oz carry weight.
What steel does the Benchmade Boost 590SBK use?
The Benchmade Boost 590SBK uses CPM-S30V premium stainless steel at 58-60 HRC. The black coating adds glare reduction and a second layer of corrosion protection, and the serrations keep cutting aggressively through rope and webbing.
Is the Benchmade Boost 590SBK an automatic knife?
No. The Benchmade Boost 590SBK is an assisted opening knife, not an automatic. The AXIS Assist mechanism completes the blade's travel after a manual start, with a slide safety to keep it closed. Assisted openers face fewer restrictions than automatics in most places, but confirm your local laws.
What is a Blue Class Benchmade knife?
Blue Class was the everyday carry tier in Benchmade's old class system, and the Benchmade Boost 590SBK shipped as a Blue Class knife. Benchmade dropped the class labels, but the knife was made in Oregon City, Oregon alongside the current lineup.
Does LifeSharp cover the serrations on the Benchmade Boost 590SBK?
Yes. Benchmade's LifeSharp lifetime service fully covers the Benchmade Boost 590SBK, including factory resharpening of both the plain and serrated sections of the combo edge.
Where can I buy the Benchmade Boost 590SBK?
The Benchmade Boost 590SBK is discontinued, so remaining examples come from leftover dealer stock or the secondary market. Going Gear is an authorized Benchmade dealer and stocks the current Benchmade range, including modern black blade combo edge alternatives.
