Best uni-ball Mechanical Pencil Leads of 2026

Name: Uni NanoDia 0.5mm Colour Mechanical Pencil Leads Set
Brand: uni-ball

Jordan Akhtar

Last Updated: 12 Feb 2026

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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

#TOP 1

Uni NanoDia 0.5mm Colour Mechanical Pencil Leads Set

9.8

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#TOP 2

Uni-ball Kuru Toga Nano Dia 0.5mm HB Leads 36 Pack

9.7

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#TOP 3

Uni NanoDia 0.5mm Lavender Mechanical Pencil Leads

9.5

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Top 10 uni-ball Mechanical Pencil Leads

#TOP 1

Uni NanoDia 0.5mm Colour Mechanical Pencil Leads Set

uni-ball
402593

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.

9.8

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What We Like

Vibrant colour selection
Durable and smooth writing
Large quantity of leads
Ideal for detailed work

#TOP 2

Uni-ball Kuru Toga Nano Dia 0.5mm HB Leads 36 Pack

uni-ball
Toga Nano
Blue

36 x Uni-Ball Kuru Toga Nano Dia 0.5mm HB Mechanical Pencil Refill Leads (3 Packs)

The Uni-ball Kuru Toga Leads offer 36 fine 0.5 mm HB refills, ideal for precise writing or drawing. Thanks to the nano diamond technology, these leads provide smoother and stronger lines that last longer, so you won’t need to replace them often. They are designed to work perfectly with the Uni-ball Kuru Toga mechanical pencil, which self-sharpens as you write, keeping your lines neat and consistent. These leads also fit any other 0.5 mm mechanical pencils, giving you flexibility and convenience.

9.7

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What We Like

Long-lasting nano diamond leads
Compatible with Kuru Toga pencil
Suitable for all 0.5mm pencils
Consistent, smooth writing

#TOP 3

Uni NanoDia 0.5mm Lavender Mechanical Pencil Leads

uni-ball
U05202NDC.34*5
Lavender

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.

9.5

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What We Like

Easy to erase
40% stronger than usual leads
Smooth writing experience
Value pack of 100 leads

#TOP 4

Uni-Ball 0.7mm 2H Refill Leads Pack

uni-ball
UL-1407

Uni-Ball 0.7mm 2H Leads - 144 Leads in Total - Refillable Writing Instrument

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.

9.4

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What We Like

High-quality refill leads
Strong and smooth writing
Compatible with most automatic pencils
Great value for money

#TOP 5

uni-ball Kuru Toga Self-Sharpening Pencil Pack

uni-ball
Kuru Toga
Smoke
14 Piece Set

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.

9.2

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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 6

UNI NANO HB Mechanical Pencil Leads

uni-ball
ul05-102nd
Transparent

Uni Nano Dia Refill Leads - 0.5mm HB - 12 Tubes of 12-144 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.

9.2

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What We Like

High-quality diamond technology
Super strong and durable
Smooth writing experience
Convenient packaging
Ideal for various uses

#TOP 7

uni-ball 0.5mm 2H Refill Leads Tube

uni-ball
UL-4007
Gray
1 count (Pack of 1)

Uni Nano Dia 0.5mm Pencil Leads Grade 2H (Tube Of 40 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.

9.0

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What We Like

High-quality refill leads
Strong and smooth writing
Compatible with 0.5mm pencils
Convenient tube of 40 leads

#TOP 8

uni-ball 0.7mm HB Refill Leads Tube

uni-ball
UL-4007

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.

8.9

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What We Like

High-quality refill leads
Strong and smooth performance
Ideal for automatic pencils
Convenient tube of 40
Uni-Ball branded reliability

#TOP 9

Uni-Ball 0.9mm HB Mechanical Pencil Leads

uni-ball
UL-1409

Uni-Ball 144 Leads, 0.9mm HB, Black, Mechanical Graphite Pencil 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.

8.8

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What We Like

High-quality leads
Strong and smooth writing
Compatible with various pencils
Great value for money

#TOP 10

Uni-Ball 0.7mm H Refill Leads Pack

uni-ball
UL-1407

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.

8.6

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What We Like

High-quality refill leads
Strong and smooth performance
Compatible with most automatic pencils
Great value for money

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 8,256 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 £6.76.

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.

Written by

Jordan Akhtar

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.