The #3F / #3¾ clipper blade
A #3F / #3¾ blade leaves about 1/2" (13 mm) of coat.
Cut length
1/2"(13 mm)
Naming trap: Oster's #3F and Andis's #3¾FC both leave 1/2" (13 mm) — but Wahl's #3F leaves 10 mm. Same label, three brands, two different lengths: check the brand before you buy this size.
Type
Finish cut (F/FC) — even, smooth result
What the #3F / #3¾ is used for
- The longest common full blade — plush pet trims that still show real coat
- Oster's chart staple for Bichon, Shih Tzu, Maltese and doodle bodies
- The last stop before snap-on-comb territory
Breeds this length suits
Blade choice always depends on coat condition — a matted coat needs a shorter blade than the style chart says. The blade & comb finder walks you through it.
Which clippers it fits
#3F / #3¾ detachable blades use the A5 standard — they interchange across Andis, Oster, Wahl KM-series, and Heiniger A5-style clippers regardless of which brand made the blade. They do not fit 5-in-1 adjustable clippers (Wahl Bravura/Arco) or screw-on home clippers, which take their own blade systems.
Leaves more coat
5/8HT 5/8"
Cuts closer
#4F 3/8"
All blade sizes
FAQ
- How much hair does a #3F / #3¾ blade leave?
- A #3F / #3¾ blade leaves about 1/2" (13 mm) of coat. Naming trap: Oster's #3F and Andis's #3¾FC both leave 1/2" (13 mm) — but Wahl's #3F leaves 10 mm. Same label, three brands, two different lengths: check the brand before you buy this size.
- Will a #3F / #3¾ blade fit my clipper?
- #3F / #3¾ detachable blades follow the A5 standard, so they interchange across A5-style clippers from Andis, Oster, Wahl (KM series), and Heiniger. They do not fit 5-in-1 adjustable-blade clippers (like the Wahl Bravura) or screw-on home clippers — those use their own blade systems.
Sources