40 Blade #40 Dog Grooming Blades Compatible with Andis Oster Wahl

In this review the focus is on the 40 Blade set for dog grooming, a compact replacement blade designed for routine trimming and bodywork on dogs, cats, and horses. The bottom line: this blade is best for groomers and pet owners who need an ultra-close, professional-grade cut with a consistent 1/100-in (0.25mm) length. Our review finds the blades deliver sharp, rust-resistant performance thanks to 440C stainless steel construction, and they fit common clipper heads like Andis, Oster A5, and Wahl km10, making them a practical, low-friction upgrade for regular maintenance grooming.

Key Features

• Cutting length: Leaves hair at 1/100-in (0.25mm) for very close bodywork and fine finishing on short coats.
• Compatibility: Fits Andis, Oster A5, and Wahl km10 style clippers so it can be used across a variety of professional and home units.
• Material: Made from high quality 440C stainless steel to maintain sharpness and resist water-related rusting during cleaning.
• Skin-friendly edges: Polished edges reduce irritation and make the blade safer and more comfortable when working close to the skin.
• Easy maintenance: Simple to install and clean, which speeds up routine blade swaps and reduces downtime between pets.

Who It's For

This blade is aimed at professional groomers and experienced pet owners who need a very close cut for body trimming, touch-ups, or creating smooth finishes on the back, sides, and legs. It is especially useful for animals with short coats where a consistent, near-skin result is required.

Pet owners who rarely trim or who prefer longer guard lengths should look for a larger size blade or a clipper with adjustable guards. Those needing specialty texturizing or thinning should consider other blade sizes or cutting tools better suited to layered styling.

Pros & Cons

Pros

• Sharp 440C stainless steel holds an edge and resists rust with routine cleaning.
• Very precise 1/100-in (0.25mm) cut is excellent for close bodywork and finishing.
• Polished, skin-friendly edges reduce the chance of irritation on sensitive areas.
• Compatible with widely used clipper models for flexible use across tools.

Cons

• Because it cuts extremely close, this blade is not suitable if a longer guard length or a softer, layered finish is desired.
• Close cuts may require more frequent maintenance of the blade and careful technique to avoid nicking.

Specifications

Our Verdict

The #40 40 Blade is a strong choice for groomers and experienced pet owners who want a reliable, very close cut and broad compatibility with Andis, Oster A5, and Wahl km10 clippers. Its 440C stainless construction and polished edges make it durable and safer on skin, offering good value for anyone doing frequent bodywork or finishing. Those who need longer lengths or softer styling should choose a different blade size.

Frequently Asked Questions

Will this blade fit my clipper?
It is designed to be compatible with Andis, Oster A5, and Wahl km10 style clippers; confirm your clipper model follows those mounting standards.

How close does this blade cut?
The blade leaves hair at approximately 1/100-in (0.25mm), which is an ultra-close finish suitable for body trimming and finishing.

Is the blade rust resistant?
Yes, the blade is made from 440C stainless steel and resists rust with normal cleaning and care.