Sage 5 G10 Rex 121
SKU: 76428443147

Sage 5 G10 Rex 121

Sale price$185.62 Regular price$206.25
Save 10%

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 8 - Jul 13

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

Sage 5 G10 Rex 121Description Crucible Industries CPM REX 121 is a high vanadium, cobalt bearing tool steel designed to offer the greatest wear resistance, attainable hardness, and red hardness available in a high speed steel. Created to bridge the performance gap between high alloy tool steels and carbide materials in demanding industrial applications, when applied to knife blades, it offers extreme hardness and unequalled edge retention. This unique expression of the

Description

Crucible® Industries’ CPM® REX® 121® is a high-vanadium, cobalt-bearing tool steel designed to offer the greatest wear resistance, attainable hardness, and red hardness available in a high speed steel. Created to bridge the performance gap between high-alloy tool steels and carbide materials in demanding industrial applications, when applied to knife blades, it offers extreme hardness and unequalled edge retention. This unique expression of the popular Sage 5 showcases REX 121’s remarkable properties in its full-flat-ground, satin-finished blade. To further distinguish its elite status, it also features distinctive burnt-orange-colored peel ply-textured G-10 scales. All other features of this knife are consistent with the proven Sage 5 platform, including nested, skeletonized stainless steel liners, a high-strength Compression Lock® mechanism, and a reversible wire clip that supports ambidextrous tip-up carry.

Spyderco will donate approximately 5% of sales of the Sage line to the National Alzheimer's Association Denver, Colorado Chapter. The Alzheimer's Association is the leading voluntary health organization in Alzheimer's care, support, and research. Their mission is to eliminate Alzheimer's disease through the advancement of research, to provide and enhance care and support for all affected, and to reduce the risk of dementia through the promotion of brain health. Contributions to the Alzheimer's Association provide care and support to families in Colorado coping with Alzheimer's disease, as well as fund national programs and research to ultimately find a cure. Visit www.alz.org/co to learn more about how your support makes a difference.

Annotations:

CPM Rex 121 is no longer able to be produced anymore since the "C" in CPM (Crucible Industries) has ceased operations and no other current  foundry has the required capabilities. Therefore, while this is technically part of the standard Spyderco catalog, it's not likely that there will be many more runs of it produced, if any. I expect these to become highly coveted collectible items due to both the eventual rarity and also uniquely extreme performance characteristics. 

knifesteelnerds.com has CPM Rex 121 rated as a 12/10 in edge retention, 1/10 in toughness (don't pry with knives!), and 3.5/10 in corrosion resistance. For edge-retention reference, Maxamet is 11/10 and 15V is 10/10. The gold standard of EDC steel for the last 20 years, S30V, has a 6/10. The kitchen knife "German high carbon" steel you're probably familiar with (1.4116) has a 2.5/10. Rex 121 is truly an outlier! Just be sure to be careful not to chip or snap it.

And yes, the scale color was directly inspired by the UT school colors! Hook 'em Horns! 

Technical Specifications

  • Overall Length: 7.13in 181mm
  • Closed Length: 4.17in 106mm
  • Blade Thickness: .118in 3mm
  • Tip Carry Position: Tip-Up
  • Sheath: N/A
  • Blade Length: 3in 76mm
  • Edge Length: 2.64in 67mm
  • Handle Material: G-10
  • Lock Type: Compression
  • Origin: Taiwan
  • Steel: CPM® Rex® 121®
  • Knife Weight: 3.2oz 90g
  • Clip Position: Ambi
  • Grind: Full-Flat
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 76428443147

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.2 ★★★★★
Based on 846 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
M
Verified Purchase
Michelle
Dallas, US
★★★★★ 5
Chromebook coverage.
EXCELLENT COVERAGE, hassle free, just had to return product for evaluation & decision. The only complaint I have is there was NO communication on the status of my returning the Chromebook for repair or replacement. I had to keep calling. I did get the full value of purchase on an Amazon gift card so I could buy another one for grandson’s school. Thank You SOOO MUCH ASURION, eternally grateful for your assistance! Will always purchase your coverage. MiMi
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026
T
Verified Purchase
Toveth Noyse
Cuba, US
★★★★★ 5
Received giftcard money to replace my plan-protected malfunctioning motherboard
I've been subscribing to the Asurion protection plan for a while. Recently, an Asus Prime PC motherboard I had bought a few months ago on Amazon stopped working well. I ended up considering filing a claim with Asurion to see if they would either fix/replace it or issue the purchase price money, so I could buy the failed electronics replacement component again for my custom-built PC. I went to the protection plan's website and started the claim filing process but couldn't find the category my failed component would be under in order to select it from the drop-down list. I ended up messaging the live customer service. The chat messaging was somewhat slow, the agent told me they were experiencing some communication delays throughout their systems. Ultimately, the agent was very kind and understanding, and completed the claim filing process for me on her side by asking me to provide the necessary info such as the item's product name, date of purchase, price before taxes, etc. I received a printable UPS shipping label in the email, printed it, and returned the item in the mail. Approximately 2 days later, I received an Amazon giftcard code in the email with the dollar amount equal to the item's price before the sales tax. Then I redeemed the giftcard code on the Amazon page and proceeded to apply the giftcard money to my next purchase of a replacement Asus prime motherboard, and it all worked out successfully. Therefore, I had no issues with the protection plan service and recommend it to others.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
S
Verified Purchase
Steve
Chelsea, US
★★★★★ 4
Fast and easy but I dont trust the process to be fully automated.
The process was very smooth and fairly quick. The only challenge I had was that the CLAIM status showed complete but I had to manually go look up the status. There was no email or notification it was closed. After manually checking the status, I called customer support and they said since I called in, they would process the payout. I wonder if I didnt call in if they would have processed it? Also, the phone rep said they would issue me a amazon egift card but then the next day I received a email saying they mailed out the payout. Very poor communication but so far the process was easy and fast.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 1, 2026
E
Verified Purchase
Ed
Lexington, US
★★★★★ 5
Got full credit back. Great service
Sent us Amazon credit for the full amount after our lounge chairs fell apart in less than a year. Great service!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 19, 2025
J
Verified Purchase
Jose NYC
Charlottesville, US
★★★★★ 5
100% recommended
They are very responsive and a super easy process. I have protected most of my purchases with them!!!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 14, 2026

recommand products