Cross Slim Fountain Pen Ink Cartridge Guide

Cross Slim Fountain Pen Ink Cartridge 48 mm proprietary Cross slim cartridge — Cross Slim Fountain Pen Ink Cartridge, a 48 mm proprietary ink cartridge for select slim Cross fountain pens.

For the 41 mm cartridge used in many standard Cross fountain pens, see the Cross Standard Fountain Pen Ink Cartridge guide.

Not sure this is the right cartridge? Use the Pen Refill Finder to compare cartridge size, format, and compatibility.

Buy Cross Slim Fountain Pen Ink Cartridges

Buy Cross Slim Ink Cartridges: Black, Blue
Buy Cross Fountain Pen Ink Converter: Push-In Converter, Screw-In Converter
Buy Cross Fountain Pen Bottled Ink: Black, Blue, Blue/Black

When buying a Cross Slim Fountain Pen Ink Cartridge, make sure the cartridge is listed for your specific slim Cross fountain pen. This is a separate 48 mm cartridge and should not be confused with the 41 mm Cross Standard Fountain Pen Ink Cartridge.

Quick Specs

Specification	Details
Manufacturer	Cross
Common Search Names	Cross Slim Fountain Pen Ink Cartridge, Cross slim cartridge, Cross slim ink cartridge, Cross Classic Century cartridge, Cross Spire cartridge
Cartridge Category	Fountain pen ink cartridge
Cartridge Format	Proprietary Cross slim cartridge
Ink Type	Cross fountain pen ink
Length	Approximately 48 mm
Short or Long	Slim Cross cartridge
Bore / Opening	Approx. 2.4–2.6 mm standard-international-range opening; proprietary Cross slim fit, so confirm Cross slim cartridge compatibility rather than relying on bore size alone
Converter Alternative	No widely supported Cross converter option commonly associated with the slim cartridge format; refill empty cartridges only if appropriate and done carefully
Common Ink Colors	Black and blue, depending on availability
Common Compatible Pens	Select slim Cross fountain pens, including Classic Century fountain pens and some Spire fountain pens when slim cartridge compatibility is confirmed
Key Difference	Cross Standard Fountain Pen Ink Cartridge is a separate 41 mm cartridge for many standard Cross fountain pens
Similar To	Standard international-range cartridge openings, comparison only
Not Compatible With	Cross Standard Fountain Pen Ink Cartridge, Cross Push-In Standard Fountain Pen Ink Converter, Cross Screw-In Standard Fountain Pen Ink Converter, standard international cartridges unless specifically supported, Parker cartridges, Lamy T10 cartridges, Pilot cartridges, Platinum cartridges, Sailor cartridges, ballpoint refills, rollerball refills, gel refills

Cross Slim Fountain Pen Ink Cartridge Overview

The Cross Slim Fountain Pen Ink Cartridge is a 48 mm proprietary fountain pen cartridge used in select slim Cross fountain pens. It is most closely associated with slim Cross fountain pen models such as Classic Century fountain pens, and some Spire fountain pens when slim cartridge compatibility is confirmed.

This cartridge should not be confused with the Cross Standard Fountain Pen Ink Cartridge. The slim Cross cartridge is approximately 48 mm long, while the standard Cross cartridge is approximately 41 mm long. They are different Cross cartridge formats.

The Cross Slim Fountain Pen Ink Cartridge exists because some slim Cross fountain pens have narrow barrels with limited internal space. The cartridge is shaped for those slim pen bodies and should not be replaced by a standard Cross cartridge unless the pen specifically allows it.

Why Choose the Cross Slim Fountain Pen Ink Cartridge?

Choose the Cross Slim Fountain Pen Ink Cartridge if you have a slim Cross fountain pen that specifically requires the Cross slim cartridge format.

The main advantage is fit. Slim Cross fountain pens may not have enough internal barrel room for standard Cross cartridges or standard Cross converters. The slim cartridge is designed to work in those narrower pen bodies.

This cartridge is also convenient because it is pre-filled with Cross fountain pen ink. It avoids the need for bottled ink, a syringe, or a converter, making it the simplest replacement option for slim Cross fountain pens that use this cartridge family.

Writing Characteristics

The Cross Slim Fountain Pen Ink Cartridge uses Cross fountain pen ink. Writing characteristics depend on the ink color, nib size, paper, and specific pen model.

In general, Cross fountain pen ink cartridges are designed for everyday fountain pen writing with consistent flow and color performance. They are commonly used for notes, signatures, correspondence, forms, journaling, and general writing.

Because this is a fountain pen ink cartridge, the cartridge supplies ink while the pen’s nib and feed control the actual writing experience. Flow, line width, wetness, smoothness, and dry time can all vary depending on the pen and paper combination.

Cross Slim Fountain Pen Ink Cartridge Compatibility Notes

The Cross Slim Fountain Pen Ink Cartridge is designed for select slim Cross fountain pens. It is not a universal cartridge.

Cross slim cartridges are commonly discussed as having an opening in the same general range as standard international cartridges, roughly 2.4–2.6 mm. However, that does not make standard international cartridges automatic Cross Slim replacements. Cross slim compatibility depends on the full cartridge shape, body diameter, shoulder profile, sealing point, and pen model.

For compatibility, check:

Cartridge format
Cartridge length
Cartridge opening
Sealing point
Shoulder profile
Cartridge body shape
Pen brand
Pen model
Whether the pen uses Cross slim or Cross standard cartridges
Internal barrel clearance

The safest approach is to use Cross Slim Fountain Pen Ink Cartridges in Cross pens specifically designed for the slim cartridge format.

Cross Slim vs Cross Standard Fountain Pen Ink Cartridges

Cross makes at least two different fountain pen cartridge formats: the Cross Slim Fountain Pen Ink Cartridge and the Cross Standard Fountain Pen Ink Cartridge.

The Cross Slim Fountain Pen Ink Cartridge is approximately 48 mm long and is used in select slim Cross fountain pens.

The Cross Standard Fountain Pen Ink Cartridge is approximately 41 mm long and is used in many standard Cross fountain pens.

This difference matters because the slim cartridge is actually longer than the standard cartridge. It is also designed for a different internal pen format. Do not assume that “slim” means shorter, and do not assume that the 41 mm standard cartridge will fit correctly in a slim Cross fountain pen.

If your Cross pen is not a slim fountain pen, the Cross Standard Fountain Pen Ink Cartridge may be the correct cartridge instead.

Cross Slim vs Standard International Cartridges

The Cross Slim Fountain Pen Ink Cartridge is not a standard international cartridge.

This can be confusing because the opening may be discussed near the same general range as standard international cartridges. However, bore size is not enough to confirm compatibility. The cartridge length, body diameter, shoulder shape, sealing point, and internal barrel clearance all matter.

Standard international cartridges should not be treated as Cross Slim substitutes unless the exact pen is known to accept them. For slim Cross fountain pens, start with the Cross Slim Fountain Pen Ink Cartridge whenever possible.

Cross Slim Cartridge vs Cross Converters

The Cross Slim Fountain Pen Ink Cartridge is generally tied to slim Cross fountain pen bodies where space is limited. Because of that slim internal barrel design, standard Cross converters may not fit.

Cross standard fountain pen converters, including the push-in and screw-in versions, are associated with Cross standard fountain pen cartridge systems rather than the slim cartridge format.

Common Cross standard converter options include:

Cross Push-In Standard Fountain Pen Ink Converter, comparison only
Cross Screw-In Standard Fountain Pen Ink Converter, comparison only

For slim Cross fountain pens, the practical bottled-ink option may be carefully refilling an empty Cross Slim cartridge, but that should only be done if the cartridge is clean, intact, and still seals properly.

Compatible Pens

The Cross Slim Fountain Pen Ink Cartridge is designed for select slim Cross fountain pens.

Common compatible pen categories include:

Cross Classic Century fountain pens that require slim cartridges
Cross slim fountain pens listing slim cartridge compatibility
Cross Spire fountain pens, when slim cartridge compatibility is confirmed
Cross fountain pens specifically listing Cross Slim cartridge compatibility

Do not assume every Cross fountain pen uses the slim cartridge. Many Cross fountain pens use the separate 41 mm Cross Standard Fountain Pen Ink Cartridge, and some may use a compatible Cross converter instead.

Compatible Brands

The Cross Slim Fountain Pen Ink Cartridge is primarily a Cross cartridge. It should not be treated as a universal fountain pen cartridge.

Brands and cartridge families to compare include:

Cross
Cross Classic Century fountain pens
Cross Spire fountain pens, when slim cartridge compatibility is confirmed
Cross Standard Fountain Pen Ink Cartridge, Cross comparison only
Cross Push-In Standard Fountain Pen Ink Converter, converter comparison only
Cross Screw-In Standard Fountain Pen Ink Converter, converter comparison only
Short International Ink Cartridge, comparison only
Long International Ink Cartridge, comparison only
Sheaffer Fountain Pen Ink Cartridge, comparison only
Waterman Fountain Pen Ink Cartridge, comparison only
Pilot Fountain Pen Ink Cartridge, comparison only
Lamy T10 Fountain Pen Ink Cartridge, comparison only

Compatibility outside Cross slim fountain pens should be treated cautiously unless the pen maker specifically lists Cross Slim cartridge compatibility.

Alternative Cartridges and Ink Options

The safest replacement for a Cross Slim Fountain Pen Ink Cartridge is another Cross Slim cartridge in the correct ink color.

Popular replacements and comparisons include:

Cross Slim Fountain Pen Ink Cartridge, black or blue
Cross Standard Fountain Pen Ink Cartridge, Cross comparison only
Short International Ink Cartridge, comparison only unless specifically supported
Long International Ink Cartridge, comparison only
Carefully refilled empty Cross Slim cartridge, if the cartridge is intact and still seals properly
Cross Push-In Standard Fountain Pen Ink Converter, comparison only
Cross Screw-In Standard Fountain Pen Ink Converter, comparison only

Before choosing a substitute, use the Pen Refill Size Guide to compare cartridge format, length, opening, shoulder shape, sealing point, and pen compatibility.

Cartridge Family

The Cross Slim Fountain Pen Ink Cartridge belongs to Cross’s proprietary slim fountain pen cartridge family. It is separate from the Cross Standard Fountain Pen Ink Cartridge used in many other Cross fountain pens.

This family is also separate from short international cartridges, long international cartridges, Sheaffer cartridges, Waterman cartridges, Pilot cartridges, Lamy T10 cartridges, Parker Quink cartridges, Platinum cartridges, Sailor cartridges, Zebra V-301 cartridges, and Cross standard fountain pen converters.

The key identifying features are Cross brand compatibility, approximately 48 mm length, slim Cross pen fit, and distinction from the shorter 41 mm Cross Standard Fountain Pen Ink Cartridge.

How to Identify a Cross Slim Fountain Pen Ink Cartridge

The Cross Slim Fountain Pen Ink Cartridge is best identified by its Cross slim compatibility, 48 mm length, and proprietary Cross cartridge shape.

Key identification points:

Approximately 48 mm long
Proprietary Cross slim cartridge format
Filled with Cross fountain pen ink
Used in select slim Cross fountain pens
Commonly associated with Classic Century fountain pens that require slim cartridges
May be associated with Cross Spire fountain pens when slim cartridge compatibility is confirmed
Longer than the 41 mm Cross Standard Fountain Pen Ink Cartridge
Opening commonly discussed around 2.4–2.6 mm
Not the same as a Cross Standard Fountain Pen Ink Cartridge
Not a short international cartridge
Not a long international cartridge
Not a Sheaffer cartridge
Not a Waterman cartridge
Not a Parker cartridge
Not a Lamy T10 cartridge
Not a Pilot cartridge
Not a Platinum cartridge
Not a Sailor cartridge
Not a ballpoint refill
Not a rollerball refill
Not a gel refill

Do not identify this cartridge by bore opening alone. The 2.4–2.6 mm range is useful for comparison, but Cross Slim compatibility depends on the full cartridge shape, slim barrel clearance, and pen model.

Not sure if this is your cartridge? Check the Pen Refill Finder to compare size, shape, and compatibility before ordering.

Frequently Asked Questions

What is the Cross Slim Fountain Pen Ink Cartridge?

The Cross Slim Fountain Pen Ink Cartridge is a 48 mm proprietary fountain pen ink cartridge used in select slim Cross fountain pens.

What size is the Cross Slim Fountain Pen Ink Cartridge?

The Cross Slim Fountain Pen Ink Cartridge is approximately 48 mm long.

What is the bore opening of the Cross Slim Fountain Pen Ink Cartridge?

The Cross Slim Fountain Pen Ink Cartridge is commonly discussed as having an opening in the standard-international range, roughly 2.4–2.6 mm. However, Cross Slim cartridges use a proprietary fit, so compatibility depends on the full cartridge shape and pen model, not just bore size.

Is the Cross Slim Fountain Pen Ink Cartridge the same as the Cross Standard cartridge?

No. The Cross Slim Fountain Pen Ink Cartridge is approximately 48 mm long, while the Cross Standard Fountain Pen Ink Cartridge is approximately 41 mm long. They are separate Cross cartridge formats.

Why is the Cross Slim cartridge longer than the Cross Standard cartridge?

The Cross Slim cartridge is designed for select slim Cross fountain pen bodies, so its shape and length are specific to that cartridge system. “Slim” refers to the pen/cartridge family, not simply the cartridge being shorter.

What pens use the Cross Slim Fountain Pen Ink Cartridge?

The Cross Slim Fountain Pen Ink Cartridge is used in select slim Cross fountain pens, including Classic Century fountain pens that require slim cartridges and some Cross Spire fountain pens when compatibility is confirmed.

Does the Cross Slim Fountain Pen Ink Cartridge fit all Cross fountain pens?

No. Many Cross fountain pens use the 41 mm Cross Standard Fountain Pen Ink Cartridge instead. Match the cartridge to the exact Cross pen model before ordering.

Does the Cross Slim Fountain Pen Ink Cartridge fit Classic Century fountain pens?

Many Cross Classic Century fountain pens that require slim cartridges use the Cross Slim Fountain Pen Ink Cartridge. Confirm your exact model before ordering, especially with older or discontinued versions.

Can I use a standard Cross cartridge instead of the Cross Slim cartridge?

Usually no. The Cross Standard Fountain Pen Ink Cartridge is a separate 41 mm cartridge and should not be treated as a Cross Slim replacement unless the specific pen is known to accept it.

Can I use a standard international cartridge in a Cross slim fountain pen?

Usually no, unless the specific pen is known to accept international cartridges. Cross Slim cartridges are proprietary and should not be replaced by generic international cartridges without confirmation.

Can I use a Cross converter instead of the Cross Slim cartridge?

Most standard Cross converters are associated with standard Cross fountain pen systems, not the slim cartridge format. Slim Cross pens often have limited internal barrel space, so converter compatibility should not be assumed.

What is the best alternative to the Cross Slim Fountain Pen Ink Cartridge?

The best replacement is another Cross Slim Fountain Pen Ink Cartridge in the correct ink color. If slim cartridges are unavailable, some users carefully refill empty slim cartridges with bottled fountain pen ink, but the cartridge must be clean, intact, and able to seal properly.

As an Amazon Associate, The Pen Bridge may earn from qualifying purchases.