Clipper Blade Numbers Explained: 10, 30, 40, and 5N1

If you've ever stared at a clipper blade and wondered what the numbers mean, you're not alone. Numbers like 10, 30, 40, and 5N1 appear on blades and guide combs, but their meaning isn't always obvious. In this guide, we'll break down clipper blade numbers so you can pick the right blade for every grooming task, from a close sanitary trim to a full body clip.

Understanding blade numbers is essential for achieving consistent results and avoiding skin irritation. Whether you're a professional groomer or a dedicated pet parent, knowing what each number represents helps you communicate clearly and work efficiently. Let's dive into the details.

What Do Clipper Blade Numbers Mean?

Clipper blade numbers indicate the length of the cut, measured in fractions of an inch. The higher the number, the shorter the cut. For example, a #10 blade leaves hair about 1/16 inch long, while a #40 blade cuts to about 1/200 inch, leaving the skin nearly bare. This numbering system is standardized across most manufacturers, so a #10 from one brand will cut similarly to a #10 from another.

Blades come in two main types: detachable blades (like the GSH #40) and snap-on combs that attach to a fixed blade. Detachable blades are swapped out entirely, while guide combs fit over a standard blade to adjust length. Understanding this distinction is key to using blade numbers effectively.

• Higher number = shorter cut
• #10 = 1/16 inch, good for sanitary trims
• #30 = 1/50 inch, used for very close work
• #40 = 1/200 inch, almost skin-level, often for surgical prep

30 Blade vs 40 Blade: What's the Difference?

The #30 blade cuts to 1/50 inch, leaving a very short stubble. It's commonly used for surgical prep, show grooming, and creating clean lines. The #40 blade cuts even closer, to 1/200 inch, and is often used for the most delicate areas like the pads of the feet or around the eyes. Both are considered 'close' blades, but #40 is significantly more aggressive.

When choosing between a 30 blade and a 40 blade, consider the dog's skin sensitivity. A #40 can cause irritation if used on sensitive areas, while a #30 is slightly more forgiving. For most grooming tasks, a #30 is versatile enough, but a #40 is essential for precision work. Always test on a small area first.

• Use #30 for surgical prep and show trims
• Use #40 for paw pads and eye area touch-ups
• Never use #40 on irritated or sunburned skin

5N1 Blade Sizes: The All-in-One Solution

A 5N1 blade is a versatile detachable blade that offers five different cut lengths by adjusting a lever or dial. Typically, it provides sizes equivalent to #9, #10, #15, #30, and #40. This makes it a popular choice for groomers who want flexibility without carrying multiple blades. The 5N1 blade sizes cover most everyday needs, from body clipping to detail work.

The 5N1 is especially useful for breeds with varying coat thickness, as you can quickly switch between lengths without changing blades. However, it's not a replacement for a full set of blades—some groomers prefer the precision of a dedicated blade like the GSH #40 for specific tasks. The 5N1 is a great starting point for beginners and a convenient tool for pros.

• 5N1 offers five lengths: #9, #10, #15, #30, #40
• Ideal for multi-breed grooming
• Saves time and money vs. buying multiple blades

How to Choose the Right Blade Number

Choosing the right blade number depends on the desired coat length and the area you're grooming. For a full body clip, a #10 or #7 (if you have a detachable blade) is common. For a closer trim on the face or paws, a #30 or #40 is better. If you're unsure, start with a longer blade and work your way shorter to avoid cutting too much.

Also consider the type of coat. Thick, double coats may require a longer blade to prevent pulling, while fine coats can handle a shorter cut. Always use a clean, sharp blade—dull blades can snag and irritate the skin. Regular oiling with a product like Andis 4oz Clipper Oil extends blade life and ensures smooth cutting.

• Start longer, go shorter gradually
• Match blade to coat type
• Keep blades oiled and sharp for safety

Common Blade Numbers and Their Uses

Here's a quick reference for common blade numbers: #10 (1/16 inch) for sanitary trims and body clips, #15 (1/32 inch) for tight trims, #30 (1/50 inch) for surgical prep, and #40 (1/200 inch) for the most precise work. Guide combs, like the 6mm wide guide comb (1/4 inch), attach to a #30 or #40 blade to achieve longer lengths without changing blades.

For example, using a #30 blade with a 6mm guide comb yields a 1/4 inch cut, which is perfect for maintaining a short coat. This combination gives you the flexibility of a longer cut with the precision of a close blade. Understanding these pairings helps you achieve professional results at home.

• #10: all-purpose body clip
• #15: tight trim, often for poodle faces
• #30 + 6mm comb = 1/4 inch cut

Mastering clipper blade numbers is a game-changer for any groomer. Whether you're using a #10 for a standard clip, a #40 for precision, or a 5N1 for versatility, knowing what each number means helps you achieve the exact look you want. Keep your blades clean and oiled, and always test on a small area first. With this guide, you're ready to tackle any grooming session with confidence.