Best uni-ball Mechanical Pencil Leads of 2025

Jordan Akhtar Avatar
Jordan Akhtar
Last Updated: 10 Feb 2025

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Mechanical pencil leads are a writing tool that can be used with a mechanical pencil. These leads are designed for those who want to have a consistent writing experience without the need for sharpening. Uni-ball is a brand that offers a range of mechanical pencil leads with different thicknesses and hardness levels. These leads are made with high-quality materials that ensure a smooth and consistent writing experience. They are suitable for various applications, such as drawing, drafting, and writing. Uni-ball mechanical pencil leads are a reliable and convenient option for anyone who wants to enhance their writing experience.

At a Glance: Our Top Picks

Uni NanoDia 0.5mm Colour Mechanical Pencil Leads Set Cover #TOP 1
Uni NanoDia 0.5mm Colour Mechanical Pencil Leads Set
ftb score rating icon 9.8
Uni NanoDia 0.5mm Lavender Mechanical Pencil Leads Cover #TOP 2
Uni NanoDia 0.5mm Lavender Mechanical Pencil Leads
ftb score rating icon 9.7
uni-ball 0.5mm 2H Refill Leads Tube Cover #TOP 3
uni-ball 0.5mm 2H Refill Leads Tube
ftb score rating icon 9.5

Top 10 uni-ball Mechanical Pencil Leads

#TOP 1

Uni NanoDia 0.5mm Colour Mechanical Pencil Leads Set

402593
Uni NanoDia 0.5mm Colour Mechanical Pencil Leads Set Cover
Uni NanoDia Color Mechanical Pencil Leads 0.5mm 7 Color Set, 7 Pack/total 140 Leads with Ecology Sticky Notes

The Uni NanoDia Colour Leads offer a vibrant 7 colour set, including shades like red, pink, and lavender. With a diameter of 0.5mm, these leads are perfect for detailed writing and precise drawings. You will appreciate the approximately 400 million NanoDia particles that enhance durability and smoothness, making your writing experience effortless. With a total of 140 leads in a handy 7-pack, you'll have plenty of options for your creative projects, ensuring you always have the right colour at hand.

What We Like
Vibrant colour selection
Durable and smooth writing
Large quantity of leads
Ideal for detailed work
#TOP 2

Uni NanoDia 0.5mm Lavender Mechanical Pencil Leads

U05202NDC.34*5
Lavender
0.5 mm
Uni NanoDia 0.5mm Lavender Mechanical Pencil Leads Cover
Uni NanoDia Color Mechanical Pencil Leads 0.5mm Lavender, 5 Pack/total 100 Leads Value Set

The Uni NanoDia Pencil Leads are a great choice for those who want reliable and vibrant writing tools. With a 0.5mm size, these lavender leads offer ease of erasure, making corrections simple and hassle-free. Their strength is enhanced by 40%, so you can write confidently without worrying about breakage. Comprising approximately 400 million NanoDia particles, these leads provide a smooth writing experience that is both enjoyable and effective, ensuring your notes look sharp and clear.

What We Like
Easy to erase
40% stronger than usual leads
Smooth writing experience
Value pack of 100 leads
#TOP 3

uni-ball 0.5mm 2H Refill Leads Tube

UL-4007
1 count (Pack of 1)
uni-ball 0.5mm 2H Refill Leads Tube Cover
uni-ball NANO DIA REFILL LEADS 0.5MM 2H 1 TUBE OF 40 (FOURTY) LEADS

The uni-ball Refill Leads offer high-quality 0.5mm 2H leads, perfect for all automatic pencils. These leads are designed to provide a strong and smooth writing experience, ensuring that your notes are clear and precise. With a tube containing 40 refill leads, you won’t have to worry about running out quickly. The excellent quality of these uni-ball leads means you can enjoy consistent performance, making them a reliable choice for both everyday writing and detailed tasks.

What We Like
High-quality refill leads
Strong and smooth writing
Compatible with 0.5mm pencils
Convenient tube of 40 leads
#TOP 4

uni-ball Kuru Toga Self-Sharpening Pencil Pack

Kuru Toga
Smoke
14 Piece Set
uni-ball Kuru Toga Self-Sharpening Pencil Pack Cover
uni-ball Kuru Toga 0.5mm - Self Sharpening Mechanical Pencil - Smoke Barrel - Pack of 2 + 12 Free Leads

The uni-ball Kuru Toga Pencil features a revolutionary "Kuru Toga Engine" that rotates the lead with each application, ensuring a consistently sharp tip for precise writing. Its stylish translucent barrel not only looks good but also includes a practical plastic clip for easy attachment to notebooks or pockets. The removable protective cap reveals a refillable mini eraser, allowing you to correct mistakes effortlessly. Each pack contains two smoke-coloured 0.5mm pencils, perfect for anyone who values both style and functionality in their writing instruments.

What We Like
Self-sharpening lead mechanism
Stylish and functional design
Includes refillable mini eraser
Two pencils in a pack
Comes with extra leads
#TOP 5

UNI NANO HB Mechanical Pencil Leads

ul05-102nd
Transparent
UNI NANO HB Mechanical Pencil Leads Cover
UNI NANO DIA LEADS 0.5mm HB - 12 TUBES X 12 LEADS (144 LEADS)

The UNI NANO Leads offer a convenient solution for your writing needs with 144 high-quality HB leads packed in 12 tubes of 12. Thanks to Uni's unique diamond technology, these leads are super strong and smooth, ensuring a pleasant writing experience. You can rely on these leads for consistent performance, making them ideal for both detailed note-taking and creative sketches. The HB grade provides the perfect balance of darkness and hardness, allowing you to create clear, precise lines effortlessly.

What We Like
High-quality diamond technology
Super strong and durable
Smooth writing experience
Convenient packaging
Ideal for various uses
#TOP 6

uni-ball 0.7mm HB Refill Leads Tube

UL-4007
uni-ball 0.7mm HB Refill Leads Tube Cover
uni-ball REFILL LEADS 0.7MM HB 1 TUBE OF 40 (FOURTY) LEADS

The uni-ball Refill Leads are a set of 40 high-quality 0.7mm HB leads designed for automatic pencils. These leads offer a strong and smooth writing experience, allowing you to enjoy consistent performance with every stroke. Their excellent quality ensures that you can rely on them for everyday writing tasks, whether at school or work. Ideal for those who prefer the convenience of mechanical pencils, these refill leads will help keep your writing instruments ready for use at all times.

What We Like
High-quality refill leads
Strong and smooth performance
Ideal for automatic pencils
Convenient tube of 40
Uni-Ball branded reliability
#TOP 7

Uni-Ball 0.7mm 2H Refill Leads Pack

UL-1407
Uni-Ball 0.7mm 2H Refill Leads Pack Cover
UNI-BALL REFILL LEADS 0.7MM 2H 12 TUBES OF 12 LEADS (144 LEADS)

The Uni-Ball 0.7mm Leads are an excellent choice for anyone using automatic pencils that require 0.7mm refills. With a total of 144 high-quality leads, you can be assured of consistent writing performance. These leads are strong and smooth, providing you with a pleasant writing experience whether you're taking notes or sketching. Additionally, their amazing value for money means you can stock up without breaking the bank, ensuring you always have a reliable supply on hand.

What We Like
High-quality refill leads
Strong and smooth writing
Compatible with most automatic pencils
Great value for money
#TOP 8

Uni-Ball 0.7mm H Refill Leads Pack

UL-1407
Uni-Ball 0.7mm H Refill Leads Pack Cover
UNI-BALL REFILL LEADS 0.7MM H 12 TUBES OF 12 LEADS (144 LEADS)

The Uni-Ball 0.7mm Leads provide a total of 144 high-quality refill leads, ensuring you never run out when you need them most. These leads are ideal for all automatic pencils that require 0.7mm refills, giving you versatile compatibility. They offer a strong and smooth writing experience, making your notes and sketches effortless. With amazing value for money, the Uni-Ball 0.7mm Leads are perfect for students and professionals alike, allowing you to focus on your work without interruption.

What We Like
High-quality refill leads
Strong and smooth performance
Compatible with most automatic pencils
Great value for money
#TOP 9

uni-ball Kuru Toga 0.5mm HB Leads

110700000_SML
Black
uni-ball Kuru Toga 0.5mm HB Leads Cover
uni-ball 0.5 HB Nano Dia Leads

The uni-ball HB Nano Dia Leads are designed for those who appreciate precision in their writing. With a 0.5mm diameter, these leads provide fine lines, making them perfect for detailed work. The Kuru Toga mechanism ensures that the lead rotates as you write, maintaining a sharp point for consistent results. This feature helps you avoid the hassle of frequent sharpening, allowing you to focus on your writing. Ideal for students and professionals alike, these leads enhance your writing experience.

What We Like
Fine 0.5mm writing precision
Kuru Toga lead rotation
Reduced need for sharpening
Convenient for detailed work
#TOP 10

Uni-Ball 0.9mm HB Mechanical Pencil Leads

UL-1409
Uni-Ball 0.9mm HB Mechanical Pencil Leads Cover
UNI-BALL REFILL LEADS 0.9MM HB 12 TUBES OF 12 LEADS (144 LEADS)

The Uni-Ball 0.9mm Leads provide you with a total of 144 high-quality leads, ensuring you have plenty for your writing needs. These leads are designed to be strong and smooth, making them perfect for creating clear, neat lines. They are ideal for all automatic pencils that require 0.9mm refills, offering convenience for your everyday use. With amazing value for money, you can trust in the Uni-Ball quality to enhance your writing experience.

What We Like
High-quality leads
Strong and smooth writing
Compatible with various pencils
Great value for money
Buying Guide Image
Editor's Notes

During our uni-ball mechanical pencil lead research, we found 15 uni-ball mechanical pencil lead products and shortlisted 10 quality products. We collected and analyzed 7,338 customer reviews through our big data system to write the uni-ball mechanical pencil leads list. We found that most customers choose uni-ball mechanical pencil leads with an average price of £6.66.

The uni-ball mechanical pencil leads are available for purchase. The top 10 picks range in price from a low of £2.00 to a high of £12.00, find the one that fits your budget. The seller of top 1 product has received honest feedback from 57 consumers with an average rating of 5.0.

Written by
Jordan Akhtar Avatar

Jordan Akthar owns one stationery store in Bradford, and another in Derby. He started with a corner bookshop, and now the rest is history. He is often found in his stores taking count of inventories of books and stationery. Jordan also likes to write, and this drove his passion for writing articles on stationery maintenance. He owns a blog, where in his free time, he would write DIY tips on how you can recycle and refine your stationeries.