Clipper Blade Sizes Explained: #7F vs #3-3/4F for Dogs
By Groomer's Warehouse | Published: 2026-10-16
Category: Comparisons
A practical comparison of the #7F and #3-3/4F clipper blades: what each one cuts, which coats they suit, and how to choose between them.
Quick answer
Choose the #7F when you need a close, smooth finish on thick or coarse coats and want a blade that fits any A5 clipper. Choose the #3-3/4F when you want a longer, more forgiving cut on medium to thick coats and maximum durability for repeated use. If you groom a range of dogs, owning both covers most everyday clipping jobs.
What the numbers actually tell you
Clipper blade numbers describe how much coat the blade leaves behind, not just a random label. The #7F leaves a shorter finish, while the #3-3/4F leaves a longer one. The 'F' means full tooth, so both blades are built to feed hair through the cutter smoothly rather than skipping over dense patches.
That difference in cut depth is the whole decision. A shorter blade gives a cleaner, more uniform look but leaves less room for error. A longer blade is more forgiving and better for blending, but it won't give you that tight, finished look on its own.
How coat type changes the choice
On medium to thick coats, the #3-3/4F is the easier starting point because it removes less hair per pass and is less likely to dig in. On thick, coarse hair, the #7F's full tooth design is specifically built to cut through the density with ease, so it can actually feel smoother than a longer blade that struggles to feed the coat through.
If you are unsure which your dog has, part the coat and look at the skin. If you can see skin easily, the coat is thinner and a longer blade is safer. If the coat stands up thick and you cannot see skin, you are in the range where both blades are useful.
Clipper compatibility and daily workflow
The #7F is designed for use with any A5 clippers, which makes it a straightforward addition if you already run A5 equipment. The #3-3/4F is a professional-quality grooming blade, so check your clipper's blade system before buying if you are not already using a compatible setup.
In practice, many groomers keep the #3-3/4F for body work and rough-in passes, then switch to the #7F for finishing and tighter areas. Having both on the bench means fewer interruptions and less rework.
Trade-offs at a glance
- #7F: shorter cut: Leaves a closer finish, which looks neat but shows clipper marks and mistakes more easily. Use for finishing passes and tidy results on thick, coarse coats.
- #3-3/4F: longer cut: Leaves more coat behind, so it is more forgiving and better for blending, but it will not give a tight finish by itself. Use for body work and medium to thick coats where you want a smooth, reliable pass.
- Compatibility: The #7F fits any A5 clipper; the #3-3/4F is a professional blade, so confirm your clipper system before buying. Check your clipper's blade system first to avoid a blade that will not mount.
Product facts
- Groomer's Warehouse #3-3/4F Clipper Blade: The Groomer's Warehouse #3-3/4F Clipper Blade is a professional-quality dog grooming blade for medium to thick coats, offering a smooth, reliable cut and maximum durability, with a 1/2 inch to 13mm range. Best when you want a longer, forgiving cut and a blade that holds up to repeated professional use.
- Groomer's Warehouse #7F Clipper Blade: The Groomer's Warehouse A Series #7F Full Tooth Clipper Blade is designed for use with any A5 clippers, with full teeth built to cut through thick, coarse hair and durable materials for long life. Best when you need a close finish on dense coats and want a blade that fits standard A5 clippers.
Which blade fits your dog
Best for
- Groomers who need a close, smooth finish on thick or coarse coats
- Anyone using A5 clippers who wants a blade that mounts without adapters
- Finishing work and tighter areas where a neat result matters
Not for
- Thin or sensitive coats where a shorter blade may irritate the skin
- Anyone who wants a longer, more forgiving cut for blending
- Groomers whose clippers do not use the A5 blade system
