Ohto PG-105NP / PS-107NP Refill Guide

Ohto PG-105NP / PS-107NP Refill, a 98 mm Ohto GS refill family replacement for select Ohto gel and soft ink ballpoint pens.

Need help identifying your refill? Use our refill compatibility guide to check size, shape, and fit.

Buy Ohto PG-105NP / PS-107NP Refills

Buy Ohto PG-105NP 0.5 mm Gel Refills: Black
Buy Ohto PS-107NP 0.7 mm Ballpoint Refills: Black

When buying an Ohto PG-105NP / PS-107NP Refill, check the exact model number before ordering. The PG-105NP is the 0.5 mm gel version, while the PS-107NP is the 0.7 mm low-viscosity soft ink version.

Quick Specs

Specification	Details
Manufacturer	Ohto
Refill Category	Gel / low-viscosity ballpoint refill
Refill Shape	Parker-style / G2-size compatible refill
Product Family	Ohto GS refill family
Ink Type	PG-105NP: gel ink; PS-107NP: low-viscosity soft ink
Length	98 mm (3.87 in)
Diameter	5.8 mm
Body Material	Plastic
Pressurized	No
Retractable Compatible	Yes, in compatible pens
Common Tip Sizes	0.5 mm, 0.7 mm
Common Ink Colors	Black, blue for PG-105NP; black for PS-107NP

Ohto PG-105NP / PS-107NP Refill Overview

The Ohto PG-105NP / PS-107NP Refill family includes two closely related 98 mm Ohto GS refill options. The PG-105NP is a 0.5 mm gel refill, while the PS-107NP is a 0.7 mm low-viscosity soft ink refill with a ballpoint-style writing feel.

Both refills use a needlepoint tip and a plastic refill body. They are designed for select Ohto GS-series pens and other compatible pens that accept this refill shape. Because the model names are similar, it is important to check whether your pen originally used the PG-105NP or the PS-107NP before buying a replacement.

The PG-105NP is best for users who want a very dark, fine gel line with fast-drying performance. The PS-107NP is better for users who prefer a smoother low-viscosity ballpoint-style refill with a slightly broader 0.7 mm tip.

Why Choose the Ohto PG-105NP / PS-107NP Refill?

Choose the Ohto PG-105NP / PS-107NP Refill if your pen was designed for Ohto’s GS refill format and you want to maintain the original writing feel. These refills are especially useful for Ohto GS01, Ohto Rays, Ohto Horizon Gel, and similar compatible pens.

The PG-105NP is a strong choice for precise gel writing. It uses a 0.5 mm needlepoint tip and fast-drying black or blue gel ink, making it useful for everyday notes, left-handed writers, planners, and small handwriting.

The PS-107NP is the better choice if you prefer a soft ballpoint-style writing feel. It uses low-viscosity soft ink with a 0.7 mm needlepoint tip, giving it a darker and smoother feel than many traditional oil-based ballpoint refills.

Writing Characteristics

The PG-105NP and PS-107NP share a similar refill size and general shape, but they write differently.

The PG-105NP uses gel ink. It produces a fine, dark line and is designed for quick drying after writeout. It is the better choice for users who want a crisp 0.5 mm gel line.

The PS-107NP uses low-viscosity soft ink. It writes more like a smooth ballpoint refill than a traditional gel refill. Its 0.7 mm needlepoint tip gives it a slightly broader line while still keeping the precise Ohto needlepoint feel.

Both refills are best for users who like fine Japanese needlepoint writing. The main choice is whether you prefer the sharper gel feel of the PG-105NP or the softer ballpoint-style feel of the PS-107NP.

Compatible Pens

The Ohto PG-105NP / PS-107NP Refill fits select Ohto GS-series and compatible pens. The exact refill depends on the pen model and original refill.

Common compatible pens and pen families may include:

Ohto GS01
Ohto Rays
Ohto Horizon Gel
Select Ohto GS refill compatible pens
Select pens designed around Parker-style / G2-size compatible refills
Select machined pens that accept this specific refill shape

The PS-107NP is commonly associated with the Ohto GS01, while the PG-105NP is commonly associated with Ohto gel models such as the Rays and Horizon Gel. Always compare the original refill before ordering.

Do not assume that every Parker-style pen will accept these refills perfectly. Although they are close to the Parker-style length category, small differences in shoulder shape, tip extension, and spring fit can affect compatibility.

Compatible Brands

The Ohto PG-105NP / PS-107NP Refill is primarily an Ohto refill, but it may be relevant to other pens that accept similar 98 mm Parker-style or G2-size compatible refill shapes.

Brands and pen categories to compare include:

Ohto
Kaweco Sport Rollerball, depending on model and setup
MARK’STYLE Days
Select Parker-style compatible pens
Select machined pens
Select EDC pens
Select retractable pens using 98 mm refill formats

Compatibility depends on the specific pen, not just the brand. Always compare the original refill’s length, diameter, shoulder shape, tip style, and rear-end design before choosing a replacement.

Alternative Refills

The Ohto PG-105NP / PS-107NP Refill family is close to the Parker-style / G2-size refill category, but not every substitute will fit every pen. The safest replacement is the exact Ohto model your pen originally used.

Popular alternatives and comparison refills include:

The PG-M05NP is the closest Ohto comparison if you want a more premium metal-bodied ceramic roller gel refill. The G-95NPS is another Ohto gel refill, but it is slimmer and should not be treated as the same refill.

Before choosing a substitute, use the Pen Refill Size Guide to compare refill length, diameter, shoulder shape, and tip style.

Refill Family

The Ohto PG-105NP / PS-107NP Refill belongs to Ohto’s GS refill family. This group includes refills designed for Ohto GS-series pens and related compatible models.

The PG-105NP is the 0.5 mm gel refill option. It uses gel ink and is available in black and blue. The PS-107NP is the 0.7 mm low-viscosity soft ink option. It uses soft ballpoint-style ink and is commonly available in black.

This refill family is separate from Ohto’s compact 70 mm 705NP refill, 89 mm 895NP / 897NP ballpoint refill, D1-style R-4C5NP / R-4C7NP refill, slim G-95NPS gel refill, and longer 175NP / 177NP ballpoint refill.

How to Identify an Ohto PG-105NP / PS-107NP Refill

The Ohto PG-105NP / PS-107NP Refill is a 98 mm plastic-bodied refill with a 5.8 mm diameter and needlepoint tip. The model number is the most important identifier because PG-105NP and PS-107NP use different ink types.

Key identification points:

98 mm long
5.8 mm diameter
Plastic PP barrel
POM endplug
Needlepoint tip
PG-105NP uses 0.5 mm gel ink
PS-107NP uses 0.7 mm low-viscosity soft ink
PG-105NP is commonly available in black and blue
PS-107NP is commonly available in black
Part of Ohto’s GS refill family
Similar to Parker-style length, but not automatically interchangeable
Not a D1 mini refill
Not the same as the Ohto G-95NPS
Not the same as the Ohto PG-M05NP

Do not confuse the PG-105NP with the PS-107NP. The model numbers are similar, but the PG-105NP is a gel refill and the PS-107NP is a low-viscosity soft ink refill.

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

Frequently Asked Questions

Is the Ohto PG-105NP / PS-107NP Refill a ballpoint refill?

The PS-107NP is a low-viscosity soft ink refill with a ballpoint-style writing feel. The PG-105NP is a gel refill. Because these two refills are related but not identical, it is better to identify them by model number instead of calling both ballpoint refills.

What is the difference between the Ohto PG-105NP and PS-107NP?

The Ohto PG-105NP is a 0.5 mm gel refill. The Ohto PS-107NP is a 0.7 mm low-viscosity soft ink refill. Both are 98 mm long and part of Ohto’s GS refill family, but they use different ink types and tip sizes.

What size is the Ohto PG-105NP / PS-107NP Refill?

Both the PG-105NP and PS-107NP are 98 mm long and 5.8 mm in diameter.

Does the Ohto PG-105NP / PS-107NP Refill fit Parker-style pens?

It may fit some pens designed around Parker-style or G2-size compatible refills, but compatibility is not guaranteed. The refill length is close to Parker-style size, but shoulder shape, tip extension, and spring position can affect fit.

What pens use the Ohto PG-105NP / PS-107NP Refill?

The PS-107NP is commonly associated with the Ohto GS01. The PG-105NP is commonly associated with Ohto gel pens such as the Rays and Horizon Gel. Compatibility should always be checked against the original refill.

What is the best alternative to the Ohto PG-105NP / PS-107NP Refill?

The best replacement is the exact Ohto model your pen originally used. If your pen accepts Parker-style refills, options such as the Schneider Gelion+, Schmidt EasyFlow 9000, Schmidt P900, or Monteverde Capless Gel may be worth comparing, but fit should be confirmed before purchase.

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