SKU: 76428443147

Sage 5 G10 Rex 121

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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
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SKU: 76428443147

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4.9 ★★★★★
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A
Verified Purchase
Alisha Rowan
Battle Creek, US
★★★★★ 5
Great product
Product really works good. My headphones stay right in its place. The item doesn't destroy the back of the monitor easily to remove for later.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 28, 2026
M
Verified Purchase
Mary Kay
Omaha, US
★★★★★ 5
Easy and quick instructions and set up.
I just got this headphone stand for my monitor and it works great! Easy to install and gets headphones off my desk. I like that the piece that the headphones sit on is made of a soft rubber product so it keeps the headphones in place and doesnt slide around on it. I highly recommended this product to help organize and clean up your desk space to make more room for coffee. :).
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Reviewed in the United States on January 14, 2026
A
Verified Purchase
Alex
New York, US
★★★★★ 4
Good product, decent stick
it's okay. The first night I had it on my monitor one of my cats yanked it down somehow and after that it lost all it's stick entirely. I was upset about it at first but after some hardcore taping it seems to be holding up just fine. The sticky parts that it comes with don't seem to be as strong as I thought but It's not too hard to fix and the headphones stand part itself is fairly well made and a good space saver. Overall I really enjoy this purchase. I do think there's room to improve on the hold and stick to the monitor, but it's so nice and convenient to have my headphones off my desk space completely that I'm willing to MacGyver the hold to make it work.
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Reviewed in the United States on January 14, 2026
R
Verified Purchase
Rick 🤠
Birmingham, US
★★★★★ 5
W Monitor Stand
I’m using this on a Gigabyte M28U, and it works really well for keeping my headset off the desk and making my setup look clean. The mount itself is made of plastic and holds the headset securely with no issues once installed. That said, this is a pretty specific fit situation for this monitor. The top of the M28U just barely fits the mount, and the slight curve at the top makes installation a bit more difficult than expected. The adhesive strips appear strong, but I had to hold it in place for about 5–10 minutes in the area where it wasn’t fully sticking so it could properly bond to the curved surface. Also, I’m not totally sure if it’s just this monitor, but once the headset is on the mount, it leans slightly toward the side you place it on. It’s not a dealbreaker, but it’s something I noticed depending on how the weight is distributed. My only suggestion is that it might be better if the mount was made from a slightly flexible metal or material so it could gently bend and better conform to curved monitor tops. That would make installation easier on monitors like this. Other than that, no complaints. Will update if it fails, hoping it doesn’t lol
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Reviewed in the United States on May 12, 2026
T
Verified Purchase
TABC-IS-Toyota
Bozeman, US
★★★★★ 5
Nice tool.
It works pretty well. Easy to be assembled. I love it.
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Reviewed in the United States on April 20, 2026

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