Will a #30 blade fit my clipper?

#30 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.

Is a #30 blade safe to use at home?

Close-cutting blades heat up fast and can burn skin. Check blade temperature against your forearm every few minutes, use coolant spray, and keep this length away from thin-skinned areas unless you've been shown how. When in doubt, this is a job for a professional groomer.

Clipper blades Checked against maker charts

The #30 clipper blade

A #30 blade leaves about 1/50" (0.5 mm) of coat.

Cut length

1/50"(0.5 mm)

Type

Close-cutting / surgical length

This is a base blade for snap-on metal combs.

What the #30 is used for

The comb base: every brand's snap-on comb instructions start with 'put a #30 underneath'
Oster's breed recipes are written '30 & 1" UC' — #30 under a Universal Comb
Not a body blade on its own for pets — at 0.5 mm it's essentially skin-short

Breeds this length suits

Shih Tzu Bichon Frise Maltese West Highland White Terrier

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

#30 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

#15 3/64"

Cuts closer

#50

All blade sizes

3/4HT 5/8HT #3F / #3¾ #4F #5F #6FC #7F #7 skip-tooth #8½ #9 #10 #15#30#50 #40

FAQ

How much hair does a #30 blade leave?: A #30 blade leaves about 1/50" (0.5 mm) of coat.
Will a #30 blade fit my clipper?: #30 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.
Is a #30 blade safe to use at home?: Close-cutting blades heat up fast and can burn skin. Check blade temperature against your forearm every few minutes, use coolant spray, and keep this length away from thin-skinned areas unless you've been shown how. When in doubt, this is a job for a professional groomer.

Sources