I have had the chance to buy that UKPK in G10 for 100 euros in January 2025. Since, it has been my “go to the city” favorite folder.
Sometimes replaced by the Roadie XL for a lower profile or Dredd my Urban in S90V made in Maniago and exclusive to Heinie in the UK.
The UKPK is remarkably versatile, proving itself even in woodworking. Its strong, reliable mechanism keeps it ready for anything — all while remaining fully within legal limits. Stripping vines, carving rods, scraping, cutting — it handles everything with ease. The spring “lock” never falters, and the finger choil adds an extra layer of passive safety, even if it’s rarely needed.
Its thin yet strong CPM SPY27 blade is a true joy to use on wood. In this domain, the UKPK stands out as one of Spyderco’s best hidden gems across all categories made in Golden. And if I ever had to defend myself against an animal, I believe it would perform every bit as well as the legendary Calypso (all the story here).
The tip has seen plenty of use, and all I can say is that Spyderco’s in-house SPY27 steel is extremely forgiving. You can push it hard with no damage to the edge. I’ve compared it with many of my favorite wood-cutting knives — including some specialized for woodworking — and it performs impressively in the same league.
One way I now measure the value of a pocket knife is by the pleasure I get from using it. The UKPK easily ranks among the top on my list. Strong, thin, and precise, it excels as a true “matter separator,” handling everything from everyday tasks to more demanding jobs like scraping paint.
There’s also a distinct joy in keeping the edge razor-sharp, and SPY27 has become my new favorite for that. Achieving a razor edge is a breeze. Being in the AEL-B class, it’s even easier to work on than Magnacut and is extremely leather-stropping friendly. After just a quick session on leather, SPY27 regained that legendary crisp edge — and it’s such a pleasure to use!
Hairs are flying and the convexed home made edge is shining like a mirror. This is really part of the joy to use leather strops on a steel.
So it is a joy just to strop it again and again just to maintain this razor edge.
Then for forced push cuts, the geometry of the UKPK is just a killer. It goes deep like a thin Opinel blade can go.
To keep the knife sharp, I’ve mostly relied on leather stropping, with occasional touch-ups on white ceramic, even after cutting cardboard, plastic, acidic food, and hard wood. The UKPK in SPY27 is a winner, offering a significant boost in edge retention and versatility. Maintaining its vorpal edge is even easier and more enjoyable than with the excellent Magnacut or LC200N versions.
It’s no wonder this steel has earned such a special place in my heart.
And I was not able to get any chipping or edge bending in six months. It gives an hint about the high quality of the inhouse heat treatment on that inhouse steel.
Used in the plate, the SPY27’s core refused to be damaged: no pitting, no rust, no stain. No damage on the plate ceramic too. It a gourmet companion and a wonderful carnivorous friend.
In the kitchen, geometry-wise, the UKPK can compete with the best — for example, the Patrick Bonetta Kitchen Warrior. The G10 version is also a visual delight. I never felt “under-knifed” with my Urban, but the UKPK could easily be my one and only Spyderco. A three-inch, legal, high-performance sharp blade is a must-have for EDC, and such knives are surprisingly rare.
This is 100% Sal Glesser design. This Golden-made gem is the all-terrain pocket knife my grandfather would have dreamed of! Hence its name The Golden Child. 😉
For an alternative you can now get The Metropolitan. Its little brother.
This is not the first UKPK I have reviewed in this blog. I was a very early adopter of this Sal Glesser’s approach of the modern slipjoint all made in Golden Colorado. Some of my favorite are the Salt Versions in FRN: the Green LC200N and the Yellow CPM Magnacut. I even think, the serrated version of the Magnacut version could be an amazing legal travelling knife.
But they are FRN versions. I like FRN but I do love G10. Better, I’m a sucker for sanded G-10. Hence my love for the Heinnie Urban and its non-slip peel-ply texture. At first glance the satin-finished CPM SPY27 blade and signature cobalt blue peel-plytextured G-10 handle scales are juste gorgeous. Here are the full specs on Spyderco’s pages.
Like the Heinnie the skip joint got a strong mechanism. It is really a pleasure to feel this resistance which was totally absent from the very first drop point UKPK a decade ago. (Picture from Mr Blonde, Spydercollector site)
So far, I cannot imagine my self opening it with a flick like I was able to do on the LC200N FRN version. The Spring here on this G10 version is much stronger.
Let’s do some size comparaison. The UKPK is one of the long Slipit in Spyderco’s collection. It is almost a slipjoint Caly, even longer than a Chaparral. So you really don’t feel “underknifed” when you carry it in your pocket as your only EDC. It is also really handy and practical as a kitchen knife. The best thing is that this design keeps its blade length legal in most countries.
The long leaf shaped blade is a must in the kitchen almost idea. It is pointy enough and its is enough for vegetables. Most of the works done in the kitchen like peeling potatoes, cutting oinions, you name it, was always done with a short full flat ground knife like a “Nogent Couteau d’Office”.
Something about the G-10 version is the spring/back spacer closing the handle of the knife when the FRN got an open handle easier to rinse. But it is much more gorgeous and with a stronger spring for sure !
It also gives a little more heft to the knife. 48 grams for the FRN and 63 grams for the G10 version -> 31,25% heavier to be precise, almost a third ! But I do really love my heavy butt knives since my Schrade Sharpfinger.
Now this is my first CPM-SPY27 knife. Spy27 is a alloy recipe created in house with Crucible exclusively for Spyderco. It is a CPM ! So this is a premium super steel compared to VG10 or N690… In short it is a American Powder Metallurgy version of the Japanese VG10.
In Sal Glesser words: “We offer many steels for several reasons; 1) We are Steel Junky’s (even Edge Junky’s) and we like to experience the different flavors and we try to do that. 2) We believe that many of our customers are also Steel Junky’s (even Edge Junky’s) and they too get to experience and play with and “taste” as you say, the many options.
I wanted a USA made “tweaked” version of Gingami 1 by Hitachi and after some effort with Carpenter, we have a powdered USA made steel called CTS-BD1N Which is a refinement of Gingami 1. I wanted a USA made “tweaked” version of Takefu’s VG-10 and now we have a powdered “tweaked” SPY27.“
“However, it should be noted that the SPY 27 Larrin used for testing was not heat treated by Spyderco. Some minor differences between Larrin’s heat treatment and Spyderco’s heat treatment can probably be expected. That being said, Larrin is the best source of consistent, objective data and metallurgical interpretation for steel comparisons.” To quote Karl_H in https://forum.spyderco.com/viewtopic.php?t=87383
“SPY-27 will hold the fine edge longer… Its all about the stability of the fine edge, not the total wear resistance until fully dull. In this regard, SPY-27 can do what other stainless steels cant.” to quote Submicron in the same thread.
I am aware that Cobalt’s dust can be an health issue. Of course Rex 45 and Maxamet (10% of cobalt, 1,5% for SPY27) are the heavy weight steel in their tool steel category but the Spy27 (like VG-10), like all cobalt alloys needs to be carefully cleaned after a sharpening process. (Cobalt may cause an asthma-like allergy. Future exposure can cause asthma attacks with shortness of breath, wheezing, cough, and/or chest tightness. * Cobalt may affect the heart, thyroid, liver and kidneys. * Repeated exposure to Cobalt dust can cause scarring of the lungs (fibrosis) even if no symptoms are noticed. According to https://nj.gov/health/eoh/rtkweb/documents/fs/0520.pdf)
Let say SPY-27 is in the same club as the S35VN steels in terms of performance and it especially loves fine ceramic and leather stropping. It gets easily a very crispy edge like VG10 or BD1N . ( Steel which are “leather super friendly” are also LC200N, 52100, VG10, AEB-L… ) This is a must and a real pleasure for me as I keep my knives sharp mostly with leather. A touch up and it makes flying hairs from my arm again. And it seems true so far. I have not deshouldered the edge yet and intend to use it with the factory edge for some times but leather made it hair popping sharp. (Once deshouldered it is a straight razor with excellent edge retention… much better than S30V). To quote Sal: “SPY27 for some reason, seems to be punching above its weight.”
No crossroads, this Blue Djinn loves leather like the Bill Moran FB01 in VG10 loved it.
No need to use diamonds unless you want to reprofile the blade or round the shoulder then don’t forget to rinse the blade and to clean any dust. But talking about dangerous dust, I have sanded the scales to preserve my pockets. Never breath that dust !!! Do it under water or wear a mask. I got a neighbor who has been working around that kind of heavy dust and now he is breathing with two tubes in his nostrils. So be careful with your health. This Blue G10 got a very nice texture under the thumb like some denim, textil like. It is really pleasant, almost like some Micarta found on the QSP Penguin.
So when you sand G10, just go outside in the wind or work under water. You don’t want to breath G10 dust made of fiberglass and epoxy. Just rinse it under the tap to have it back to normal. Once tuned at your hand, G10 is a very very nice material.
As you can notice the scales are even thicket than the blade and the blade is perfectly centered.
There is the famous middle/half stop when closing or opening the knife. It works like a safety measure. This knife is harder to close than to open.
The UKPK is a very ergonomic knife. It feels like it melt in the hand. It is so confortable for heavy cuts. Because this blade can work hard with zero play.
The “pistol grip” is common in many Sal Glesser design like the Endura or the Military. It is much more pronounced on the Massad Ayoob.
No hotspots for me a very safe handle, really, this lil slipjoint is screaming to be used hard.
It is even confortable edge up.
With the Roadie XL. Another great Slipit with a very low profile, almost like a pen in your shirt pocket.
And the mighty Chaparral serrated. Two of Sal’s best designs. Two wolves in sheep disguise thanks to their thin solid blades.
I have decided to de-shoulder the edge for a gentle convex result in the middle of the belly.
My old leather with some polish compound is ready again to smooth the edge to razor level.
Because I want a better touch on the leather, I usually keep the normal edge at the point to keep material there and near the ricasso as I use this portion for special shores like removing the aluminium cap on bottles.
The Coke Bottle Butt test is passed with flying colors. As you can notice the plastic is 3mm thick. Not a single scratch on the blade.
So what do we got so far ? A master piece of knife design by monsieur Sal Glesser with a strong construction and state of the art in-house alloy serving a thin blade and an ergonomic handle. My advice: try to grab one before they disappear, it seems that G10 version is not here to last and it is really a sapphire: a true blue jewel !
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