Best uni-ball Mechanical Pencil Leads of 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
Top 10 uni-ball Mechanical Pencil Leads
Uni NanoDia 0.5mm Colour Mechanical Pencil Leads Set
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.
Uni NanoDia 0.5mm Lavender Mechanical Pencil Leads
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.
uni-ball 0.5mm 2H Refill Leads Tube
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.
uni-ball Kuru Toga Self-Sharpening Pencil Pack
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.
UNI NANO HB Mechanical Pencil 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.
uni-ball 0.7mm HB Refill Leads Tube
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.
Uni-Ball 0.7mm 2H Refill Leads Pack
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.
Uni-Ball 0.7mm H Refill Leads Pack
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.
uni-ball Kuru Toga 0.5mm HB 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.
Uni-Ball 0.9mm HB Mechanical 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.
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.

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.