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Home Shop FP Bestsellers Gravitas - Ultemate Vac Ultem
Gravitas

Gravitas - Ultemate Vac Ultem

€200,00 €140,00 / Sale
Tax not included. Shipping calculated at checkout.
4.61 (44 reviews)
Nib: Steel
Nib Size: Extra Fine
Gravitas - Ultemate Vac Ultem
€200,00 €140,00 /
Nib: Steel
Nib Size: Extra Fine

 
 
Description

Introducing the Gravitas Ultemate Vac, a groundbreaking design and Gravitas' inaugural venture into complex filling systems. This fountain pen redefines durability, incorporating titanium in key areas to ensure longevity, addressing common weaknesses found in other vacuum pens. ULTEM resin is a high performance polyetherimide thermoplastic (PEI) - used in the manufacturing process of circuit boards, sterilisation equipment and most notably in the making of aircraft parts, it offers high strength and stiffness, a broad chemical resistance, making it expensive and used for only high demanding applications.

Despite its robust construction, the fountain pen remains lightweight, featuring a transparent Ultem section that allows for easy monitoring of ink levels in the secondary chamber. Easy to clean and maintain since the whole design is put together using threads and gaskets, different from other vacuum pens assembled using glue.

The 25mm-long section, tapering from 11.9mm to 10.2mm in width, provides a comfortable grip that is well known by fountain pen users - the hour glas shape. The nib is a steel size #6 designed and manufactured by Gravitas - paired with abs plastic feeder.

With a generous capacity exceeding 2.5ml and a secondary chamber holding 0.7ml, the Ultemate Vac offers ample ink for extended writing sessions. The second chamber is equipped with a shut-off valve to prevent ink mishaps, ensuring a mess-free experience. When using the Ultimate Vac it is recommended for the end knob to be unscrewed, thus offering a more constant and wet ink flow. 

Designed for convenience, this pen can be posted and disassembled for thorough cleaning. A crucial note: when removing the nib or cleaning the pen, apply silicone grease carefully to the threads and barrel inside to maintain water-tight integrity/smooth operating plunger and prevent ink spills. 

Elevate your writing experience with the innovative and resilient Gravitas Ultemate Vac.

Specifications:

- brand: Gravitas
- type: Fountain Pen
- color: Yellow/Demonstrator
- body material: Ultem
- cap type: Screw-cap
- filling mechanism: Vacuum 
- nib material: Steel 
- nib size: Extra Fine, Fine, Medium
- postable: Yes
- trim: Silver
- length overall (closed): 150 mm
- length overall (posted): 160 mm
- body length: 142 mm
- cap length: 65 mm
- body diameter: 15 mm
- cap diameter (without clip): 16 mm
- weight (overall): 30 grams
- body weight: 25 grams
- cap weight: 5 grams

Specifications

Brand: Gravitas
Model: Ultemate Vac
Edition:
Color: Yellow and Demonstrator
Body Material: Ultem
Finish:

Cap Type:
Screw
Filling Mechanism:
Vacuum Filler
Postable:
Yes
Trim Color: Silver
Length Overall (Closed): 150 mm
Length Overall (Posted): 160 mm
Body Length (Uncapped):
142 mm
Body Diameter: 15 mm
Cap Diameter (Without Clip): 16 mm
Weight Overall: 30 g
Body Weight: 25 g

Customer Reviews

Based on 44 reviews
Write a review
80%
(35)
11%
(5)
2%
(1)
5%
(2)
2%
(1)
92.9
100.0
C
Chris

The best Jowo #6 pen body on the market. Just an overall fantastic pen. Delivery was also really quick. Im in the US and recived the item in less than a week.

S
Stephen

Excellent pen!

D
Destiny Smith
Almost Perfect!

This pen is nearly perfect!
The fit and finish of my pen is perfect, there are no gaps, chips, burrs, spurs or cowboy boots anywhere on this pen; the Ultem is polished to the point of looking like amber polycarbonate.
The filling mechanism is a vacuum filler system, but it has a secondary ink chamber between the primary ink chamber and the feed, similar to the system that an Italian pen company pioneered about 28 years ago.
The nib and feed are very smooth. I have a Fine nib, and I find the line to vary from Fine to Medium, depending on which ink and paper you use. The nib is relative wet, which makes it perfect for me, because I find Pelikan 4001 Royal Blue to be “dry” enough to cause hard starts and skips with most of my pens, but Gravitas pens seem to thrive on it. So, if you think this pen is too wet, try the Pelikan 4001 Royal Blue ink.
The cap threads…okay, yes, whenever you you force two dissimilar materials together, like an Ultem/plastic cap and metal threads, the softer material is going to wear out sooner. Oftentimes, that’s intentional; you sacrifice the cheaper/easier to replace part, but prolong the life of the more expensive/more difficult to replace part. It should be cheaper to replace a cap than the body of the pen, which is an assembly of various parts, glued together. You can minimize damage from cross threading when capping the pen by rotating the the pen and cap in an uncapping rotation, gently pushing the two parts together, until you feel the threads “snap”. Some pens may require a “double snap”. Then everything should be lined up correctly to allow you to cap the pen without damaging the pen.
On the plus side, the clear material lets you see how the precisely machined lip inside the cap meets the forward edge of the grip section, preventing the nib from drying out very quickly. Had the pen inked up, sitting on my desk, untouched, for over a week, and it started writing as soon as the nib touched paper.
Would definitely buy again if I lost this pen!

Z
Zaman
My experience with Ultemate Vac and Pen Venture

This is a good quality pen - exectly as showen in the photos on the website and has all the quirks etc. as described in videos. I love it, the qiality is very good and the extra fine nib on this pen is just gorgeous. I bought both this pen (at a great price) along with my Gravitas Carbon Black in Fine nib and I tend to prefer this pen for its dimentions and ease of writing. Few important things to mention. This was my first purchase from Pen Venture and my experience with this team was A+++. Their response time to queries, shipment etc. was the best in my experience. DHL as a complany is excellent in terms of time they take for delivery, but boy are they expensive!! their charges on this end (after already paying shippment cost on checkout) were phenomenal - more than the VAT+Taxes on this end in UAE. All in all very satisfied and will highly recommend Pen Venture and Gravitas to the community. Thank you to Ben Walsh (His accent reminds me of many years I spent in Dublin) and Pen Venture Team.

M
Matthew
Great Alternative to Pilot 823

This is a great alternative to the Pilot 823 and honestly I’d pick this over the 823. First, I’ve tried an 823 several times and I don’t care for their nibs, which is usually the case with Gravitas but it appears they’ve changed their nibs. The broad nib on this was acceptable. Broad line and a big juicy. I LOVE how deeply and securely this pen posts. It is truly great in the hand and perfectly balanced. It’s also so easy to take apart if you desire and for cleaning.

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© 2026 Pen Venture - Passion Virtuous,

Review picture
Isaac Leong
My wonderful first Titan pen

Beautiful colour. The nib is smooth and wet. The grip section is textured, I will not worry about writing with it in hot weather. This is my first demonstrator pen, I love watching the ink level drops (very slowly) in the barrel. The package is packed very securely. Thank you staffs at Pen Venture.

Fifty4T - Titan Slim Line Aluminium Emerald Shadow
★ Reviews

Let customers speak for us

877 reviews
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92%
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6%
(54)
1%
(6)
1%
(5)
0%
(4)
838
49
R
Gravitas - Vac 2.0 Aluminium | Black
Richard L Sherman
Gravitas Vac 2

The construction of the Vac 2 is flawless. The textures of the materials and it's simple lines display an elegant beauty. The large steel nib delivers a pleasant writing experience and also provides a bit of flex.

C
Gravitas - Vac 2.0 Aluminium | Black
Chris

Amazing Pen! Gravitas makes one of the best piston fillers out there. I dont keep the nib and normally use the pen for coustom flex nibs with Jowo #6 compatible nib units. So, i really cant speak on the nib. However, this pen is just built with high quality components. The weight, feel, and overall aesthetics are unmatched. You wont find better at this price point.

R
Platinum - #3776 Century Kaga Maki-e Sansui GT
Robert Moore
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I recently acquired the Platinum Maki-e Sansui pen in a Medium nib. The Pen Venture team was kind enough to carefully inspect and tune this pen before sending it on to me. Many thanks for that. It writes very smoothly and with a steady flow of ink. The Medium nib is my favorite nib configuration from the Platinum brand. The line width is nice and thin and always writes consistently right of the box. This lovely Maki-e pen was no different. I highly recommend it.

D
Gravitas - Steel Nib Unit Silver | No. 6
David Sumrell
Gravitas #6 extra fine nib

The extra fine nib came tuned to perfection—a joy to write with. Thank you Emy!

J
Gravitas - Vac 2.0 Aluminium | Black
Jimmie
FANTASTIC!

The VAC 2.0 is a great improvement to an already great pen (the original VAC Ultem). The weight and balance are spot on. The cap and the new threads engage without hesitation. No missed closures and the cap has a nice stop when threading back on. It posts securely without issue. Filling with the Kraken system is easy. I got a medium nib and it is smoooooooth. Mine is on par with my 823 medium nib The smoothness, wetness and bounce would make you think it's a gold nib. Line width is slightly narrower than the 823 medium. The pen feels solid and well built. I'm not worried about this one getting knocked around. Overall a great pen. Shipping from Pen-Venture to Colorado was five days! Great pen and service all around!

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