You may also like#6 TITANIUM Ultraflex Nib Units and Assemblies
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Questions: Call 650-996-7866 or send us an email at info@ospreypens.com
Questions: Call 650-996-7866 or send us an email at info@ospreypens.com
Osprey Pens Titanium Ultra-flex Nib units are available in Extra-Extra-Fine, Extra-Fine, Fine and Medium tip sizes. The nib is springy, and has more give than a stainless steel ultra-flex. When writing with it, the nib feels softer than stainless steel and is reminiscent of old vintage flex nibs.
If you have already purchased an Osprey Milano, Scholar or Madison fountain pen, you can now buy replacement assemblies or just a nib unit.
The assemblies cost $54, while the replacement nib units are priced at $49. The additional parts that come with the assembly are the generic outer grip section and the osprey converter, that you don't get with just buying the nib unit.
If you are buying an assembly for the Madison series, it comes with a generic Clear grip section, and if you are buying for a Scholar or a Milano, it comes with a generic Black grip section.
Note that the #6 ultra-flex Titanium nib units come with custom ebonite feed to keep up with ink demands of flex writing. They work with Osprey custom converters or generic International converters such as K5 Schmidt converters.
Do not use India Inks, they can clog the ebonite feeds. Fountain Pen inks are recommended. Few examples of inks that worked best with ebonite feeds as reported by our customers: The Noodlers Standard Black , MontBlanc Burgundy Red Ink, Herbin Perle Noire, Platinum carbon Black, D'Artremis document Black Ink, Pilot Iroshizuku line of inks, Rohrer & Klingner Black SketchINK.
Pls mention inks that worked best, and inks that didn't, if you leave us a review (very grateful for that!). You know and we know that a big part of getting the most out of any pen is to get the nib/feed/ink combination right, especially with the flex nibs.
Tips:
-Upon receiving a brand new nib unit, wet the nib unit in a soapy solution or at the minimum in water, before fitting it in the pen.
Send us an email to info@ospreypens.com if you have any questions.
On 7/16/2025 I left a 1 star review about my new Titanium Ultraflex, which was giving me several problems. I had been having issues with the supplier from whom I'd purchased it, which was disappointing and frustrating. Osprey Pens, however, reached out to me and have been extraordinarily helpful over the last few weeks.
We've exchanged many emails, and they invested time and effort including a long video call, to help me solve the problems. We've worked out what the possible issues are and I'm now applying various fixes and adjustments they suggested. If these all work I'll be very happy with the nib and they are also sending me a second slightly different nib, as a backup.
This is the very best of customer service and I wouldn't hesitate to buy Osprey pens in future (albeit probably from a different intermediary supplier).
i have enjoyed this nib so much. my handwriting looks great and the flex is easy and effortless.
I had the opportunity to try all the sizes and finally got the medium one. In a short time, I tested it with some of my inks and here are my impressions so far:
1) J. Herbin Rouille D'Ancre
While this ink shades beautifully with this nib's impressive flex, it had pretty dry flow most of the time and I experienced some railroading.
2) Pilot Iroshizuku Fuyu-Gaki
As expected from an Iroshizuku ink, this one flows smoothly. Well, maybe a bit too smoothly. While there wasn't any railroading, I think this ink was actually too wet to be used in a flex nib like this with an ebonite feed. When used with no pressure, I had pretty thick lines with less precision where they were otherwise thin and precise. Still it is a lovely color and I haven't had any issues about bleeding when paired with Tomoe River 52gsm.
3) Parker Quink Black
This is my favourite so far! While it's not as wet as Fuyu-Gaki, this ink still flows well and I think this is the one that was able to catch a balance between too dry and too wet. There wasn't any railroading even when used in long sessions. Dries reasonably fast with a bronze sheen. Being classy and affordable to keep up with this "fountain" of a fountain pen -an ink drinking monster really-, this one was my favourite performer. Both on the paper and in the wallet.
As advertised. A very nice product.
The thick one is good, but the thin one is not very thin, so it's not very good. If this is the case, the G-pen unit would be better.
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