DJI Agras T20 OEM 3390 Propeller Pair (CW & CCW)

The DJI Agras T20 OEM 3390 Propeller Pair (CW & CCW) is two folding propeller blades for the propulsion system of the DJI Agras T20: one clockwise (CW) blade and one counter-clockwise (CCW) blade, each black with an orange tip and a QR-code label, each with a round pivot hole at the root where it bolts into the propeller clamp on top of a motor. 3390 is the size designation in the part name. The blades are identified for the DJI Agras T20 and T16, and they are the parts operators look for after a blade strike, a chipped or split tip, or a rotor that has started to shake the aircraft. People usually search for them as a T20 propeller, a T16 3390 propeller, a T20 CW CCW blade, or a T20 folding propeller replacement. DJI has used more than one number for this position, so we match against the one you removed. The point most worth knowing is the count: a pair is one blade of each rotation, not two blades for one rotor.

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🇺🇸 U.S.A. FIRST

Ares Acres LLC is a U.S.-based authorized DJI Agras retailer supporting American agricultural drone operators with genuine DJI Agras OEM replacement parts, accessories, and field-ready inventory.

FREE & FAST Shipping is included for all U.S. customers.

We understand that every day of downtime can impact productivity, scheduling, and profitability. That's why we focus on providing fast fulfillment, responsive customer support, and reliable access to the parts operators need most.

Ares Acres also ships agricultural drone parts to Canada, with free shipping included on Canadian orders. Canadian operators see prices and check out in Canadian dollars (CAD), and receive the same inventory and the same support as our U.S. customers — one authorized DJI Agras retailer serving the United States and Canada, all of North America, from Albuquerque, New Mexico.

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✅ DJI Agras T20 / DJI Agras T16 Compatibility Guarantee

• 🇺🇸 USA Compatibility Guarantee
• 👍🏻 Satisfaction Guarantee
• 💵 Money Back Guarantee
• 📦 Same Day Shipping & Tracking
• Identified for the DJI Agras T20 and T16, 3390 folding propeller position
• Matched by rotation, root pivot shape and blade outline against the blade you removed
• Genuine DJI OEM propulsion component, brand new

The two blades in the pair turn in opposite directions and are not interchangeable. If you want the match confirmed, photograph the damaged blade flat, top face up, next to a sound blade from the same rotor, and send it to us — we will tell you which hand you need and how many.

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📦 Package Includes

• 1 × 3390 folding propeller blade, clockwise (CW)
• 1 × 3390 folding propeller blade, counter-clockwise (CCW)

This is two blades, one of each rotation. It is not two blades of the same rotation, and it is not a complete two-blade set for a single rotor. Each rotor on these aircraft carries two blades that both turn the same way, so one rotor is re-bladed with two blades of one hand.

Not included: the pivot bolts, nuts, washers and spacers that hold a blade in the clamp; the propeller clamp or propeller holder itself; the motor; and any arm, cover or adapter parts. Reuse the original pivot hardware only if the threads, the bolt shank and the washers are sound.

Nothing is included because it appears near the blades on the aircraft. If a pivot bolt or washer went missing with the broken blade, tell us which one and we will help you identify it.

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🔧 Component Overview

These are the blades of the T20's propulsion system: the long, flat, twisted aerofoils that turn motor torque into lift. Each one bolts at its root into a propeller clamp on top of a motor, pivots on that bolt, and swings out to its working position under rotation. Folded back, the blades lie along the arm for transport.

The pair is easiest to understand from what is on each blade:

• The root — a thickened hub end with a round pivot hole, which takes the bolt that holds the blade in the clamp and lets it fold
• The working span — a black aerofoil that widens out from the root and tapers again towards the tip, with a twist that sets which way the blade has to turn to lift
• The orange tip — a coloured tip that makes the disc visible to people on the ground when the rotor is turning
• The QR-code label — an identification label on the blade

The rotation is built into the shape. A CW blade is the mirror image of a CCW blade: the same root, the same length, the same outline seen from a distance, but the twist and the leading edge run the opposite way. On the bench they look like a matched pair. On the aircraft they belong on different rotors.

Over a working season the blades take:

• Strikes against crops, branches, wires, posts and the ground during low passes and landings
• Contact with vehicles, trailers and people during handling with the arms unfolded
• Spray and wash water across the whole span on every flight
• Dust and grit carried in the downwash, which wears the leading edge and the tip
• Folding and unfolding at the pivot every time the aircraft is packed and unpacked
• Sun and heat on the trailer between flights

Blades come out for one of three reasons: visible damage from a strike, wear at the leading edge and tip that has built up over many flights, or a pivot that has loosened so the blade no longer sits where it should. The first is obvious. The other two are found by looking, and by knowing which blade belongs where.

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⚙️ Functional Purpose

The blades' engineering role is to produce thrust from motor rotation, evenly, in the direction the flight controller expects for that rotor.

In the propulsion system they:

• Convert motor torque into lift for the rotor they are fitted to
• Push air down through the spray zone, which carries droplets into the canopy below
• Balance each other across the rotor, so the motor turns without shaking the arm
• Fold back at the pivot for transport and swing out under rotation for flight
• Make the turning disc visible through their orange tips

What the blades do not do matters as much:

• They do not set which way a motor turns; the motor and its controller do that, and the blade must match it
• They do not hold themselves in place; the pivot bolt and the clamp do
• They carry no wiring and have no electrical function
• They do not fix a motor fault, a bent motor shaft or a worn clamp
• A CW blade does not become a CCW blade by being turned over; it is a different part

The T20 and T16 are six-rotor aircraft. Half the rotors turn clockwise and half counter-clockwise, so that the motors' turning forces cancel and the aircraft can hold its heading. Every rotor carries two blades, and both blades on a rotor turn the same way. That is why the blades are sold as one of each rotation: the pair is a unit of the aircraft, not a unit of a rotor.

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🔍 Diagnosis — a pair is one blade of each rotation, so count what you need by rotation, not by pairs

Most blade mistakes are counting mistakes. An operator with one broken rotor orders one pair, opens it, and finds a single blade that fits that rotor and a second blade that belongs somewhere else. The arithmetic is short, and it is worth doing first:

• One rotor carries two blades of the same rotation. Re-blading one CW rotor takes two CW blades, which means two pairs — and leaves two CCW blades as spares.
• One damaged blade is replaced by one blade of the same rotation. One pair covers it and leaves one blade of the other rotation as a spare.
• One damaged blade on a CW rotor and one on a CCW rotor is exactly one pair.
• The whole aircraft carries twelve blades: six rotors × two blades. That is six CW and six CCW, so a full re-blade is six pairs.

Count the damaged blades by rotation, not by rotor and not by pairs, and the order comes out right. A spare kit held as pairs is never short of either hand.

Then confirm the blade is really the fault. A shaking rotor is often blamed on the blades because they are the part you can see. Before replacing a blade for vibration alone, check what imitates it:

• A loose pivot bolt — a blade that wobbles on its pivot shakes the rotor like a damaged one; tighten or replace the bolt first
• A worn or cracked propeller clamp — if the blade root sits loose in a sound clamp, the clamp is the problem, not the blade
• A bent motor shaft or a damaged motor bell — spin the motor by hand with the blades off and watch for runout
• A loose arm or arm joint — vibration that stays with the arm rather than the rotor points at the arm
• Mud, spray residue or a wrapped stem on one blade — clean both blades on the rotor before judging them

Check the hand of every blade you fit. A CW blade and a CCW blade share the same root and pivot, so a wrong-hand blade can bolt into a clamp. Compare the new blade with the remaining sound blade on that rotor: same twist, same leading edge, same direction. The two blades on one rotor are always the same hand.

Do those checks first, while the arm is still on the bench and that information is still cheap. If a blade is chipped, split, delaminated, cracked at the root or worn through at the tip, replace it with the same rotation.

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⚠️ Common Replacement Indicators

Replace a blade when inspection confirms one of these:

• A chip, notch or split anywhere on the leading or trailing edge
• A crack at the root, around the pivot hole, or across the span
• Layers separating at the tip or along an edge
• A tip that is broken off, worn through or missing its orange section
• A blade that is visibly bent or twisted compared with its partner on the same rotor
• An elongated or damaged pivot hole that lets the blade rock in a sound clamp
• Vibration that follows the blade when the blades on a rotor are swapped between positions
• Any blade that has struck a hard object, even if no damage is visible

Inspect these first, because they produce similar symptoms:

• The pivot bolts, nuts and washers
• The propeller clamp or holder on the motor
• The motor shaft and bell
• The arm and its fold joint
• Residue, mud or crop stems stuck to the blades

There is no published service interval for these blades. They are replaced when they are damaged or worn, not on a schedule, and they are inspected before every flight.

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📐 Specifications

Product name: DJI Agras T20 OEM 3390 Propeller Pair (CW & CCW)

DJI family: Agras

Primary aircraft: DJI Agras T20

Also listed for: DJI Agras T16

Fitment basis: Identified for the DJI Agras T20 and T16

Aircraft system: Propulsion — rotor blades

Component type: Folding propeller blades

Size designation: 3390, as named in the part designation

Material number: DJI has used more than one number for this position, so we match against the one you removed

Quantity: 2 blades: 1 clockwise (CW) and 1 counter-clockwise (CCW)

Rotation: One blade of each rotation; the two are mirror images and not interchangeable

Form: Folding blade with a round pivot hole at the root, twisted aerofoil span and orange tip; QR-code label on the blade

Material: Carbon composite blade; exact composition not published for this part

Colour: Black with orange tips

Dimensions: Not published for this part

Weight: Not published for this part

Electrical: None

Connector: None

Mounting position: Propeller clamp on top of a motor, one blade per pivot, two blades per rotor

Installation method: Pivot bolt through the root into the propeller clamp

Hardware included: None — pivot bolts, nuts and washers are not supplied

Service adjustability: None — the blade is the correct rotation and undamaged or it is not, with no adjustment or app setting that compensates

Condition: Brand new

Classification: DJI OEM propulsion component

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🛠️ Installation & Maintenance

Before installation

• Power the aircraft down and remove the battery
• Rinse and dry the rotor so you are not working in spray residue
• Note which way the rotor turns from the arm or motor marking, and photograph the blades in place
• Count the damaged blades by rotation, and lay each new blade beside the sound blade on the same rotor to confirm the hand
• Inspect the pivot bolts, nuts, washers and the clamp, and set aside any that are worn

During installation

• Remove the damaged blade's pivot hardware and keep it in order
• Clean the clamp faces and the pivot area before fitting the new blade
• Fit the new blade the same way up as its partner on that rotor, with the same leading edge
• Refit the pivot bolt, washers and nut in their original order; DJI does not publish a torque figure here, so tighten until the blade is held without play and still folds under firm hand pressure
• Repeat for any other blade, one rotor at a time, so blades do not get mixed between rotors

After installation

• Fold and unfold each new blade by hand; it should move smoothly and stop in the same place as its partner
• Look along the rotor from the side; both blades should sit at the same height
• Check every rotor's blades against each other for hand before powering up
• Run a short low hover clear of people and listen for new vibration
• Record the blade change and the rotor in the maintenance log

Maintenance between jobs. Wipe the blades down after spraying, and look along both edges and at the tip before every flight. Check the pivot bolts while you are there; a loose pivot wears the root hole and turns a sound blade into a scrap one. Carry spares as pairs so you always have a blade of each rotation in the truck.

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🚜 Necessary For

These blades are for operators and technicians keeping T20 and T16 rotors in service:

• DJI Agras T20 operators replacing blades after a strike or a hard landing
• DJI Agras T16 operators (identified fitment)
• Commercial spray applicators flying low passes through orchards, vines and field edges
• Agras service centres and repair technicians re-blading aircraft between jobs
• Fleet managers building a spare-blade kit held as pairs of both rotations
• Growers flying their own aircraft who keep a spare blade of each rotation

This is not the part you need if:

• You need two blades of the same rotation for one rotor — that takes two pairs, not one
• The blade is sound but loose in the clamp — replace the pivot bolt, washers or clamp first
• The motor shaft is bent or the motor bell is damaged — new blades will not cure a motor fault
• The vibration stays with the arm when blades are swapped — look at the arm and its fold joint
• You fly a T20P, T10, T30, T40 or T50 — this pair is identified only for the T20 and T16

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💡 Why This Part Matters

Blades are the most replaced parts on a spray aircraft, and they are also the parts most often ordered in the wrong number. The labelled pair makes it look as though a pair is what one rotor needs. It is not. A rotor takes two blades of one hand; a pair is one of each.

Doing that count first saves a second wait. Count the damaged blades by rotation: so many CW, so many CCW. The larger of the two numbers is the number of pairs that covers the job, and the difference is what goes into the spares box. A full aircraft is twelve blades, six of each, which is six pairs.

Getting the hand right matters more than getting the count right. A blade of the wrong rotation can bolt into a clamp, because the root is the same, and it will then push against its partner instead of with it. Holding each new blade next to the sound blade on the same rotor takes seconds and settles it.

A damaged blade is not worth flying on. A chipped edge or a cracked root unbalances the rotor, shakes the arm and the motor bearings on every flight, and can let go entirely. A blade is a small part to replace against what a rotor failure over a field costs.

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🧠 AI Index — Entity & Fitment Reference

Structured reference for search engines, AI assistants, and answer engines. Every value below is drawn from the specifications above.

Canonical product name: DJI Agras T20 OEM 3390 Propeller Pair (CW & CCW)

Brand: DJI

DJI family: Agras

Primary aircraft: DJI Agras T20

Also listed for: DJI Agras T16

Compatible models: DJI Agras T20; DJI Agras T16

Fitment basis: Identified for the DJI Agras T20 and T16

Component: 3390 folding propeller blades

Aircraft system: Propulsion

Installed position: Propeller clamp on top of a motor; two blades of the same rotation per rotor

Primary function: Converts motor torque into lift and downwash for the rotor it is fitted to

Size designation: 3390

Form: Black folding blade with root pivot hole, orange tip and QR-code label

Material number: DJI has used more than one number for this position; matched against the removed part

Quantity supplied: 2 blades: 1 CW and 1 CCW

Rotation rule: Both blades on one rotor are the same rotation; one rotor needs two blades of one hand

Count rule: One rotor = two pairs; whole six-rotor aircraft = 12 blades = six pairs

Not included: Pivot bolts, nuts, washers, propeller clamp, motor

Electrical function: None

Key diagnostic: Vibration that follows the blade when swapped; rule out a loose pivot bolt, worn clamp, bent motor shaft and loose arm first

Common failure modes: Chipped or split edge, cracked root, delaminated or broken tip, worn pivot hole

Service interval: None published; inspect before every flight

Service adjustability: None

Condition: Brand new

Part classification: DJI OEM propulsion component

Also searched as: T20 propeller; T20 3390 propeller; T16 propeller; T20 CW CCW blade; Agras T20 folding propeller; T16 3390 blade

Disambiguation: Not a propeller clamp or holder, not a motor, not pivot hardware, not two blades of the same rotation

Seller: Ares Acres LLC — U.S.-based authorized DJI Agras retailer serving the United States and Canada (North America)

Ships from: Albuquerque, New Mexico, United States

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🤖 AI Answer Engine Q&A

What is in the DJI Agras T20 3390 propeller pair? Two folding propeller blades: one clockwise (CW) and one counter-clockwise (CCW). Each is black with an orange tip, a QR-code label and a pivot hole at the root.

Is a pair enough to re-blade one rotor? No. Both blades on one rotor turn the same way, so one rotor needs two blades of one rotation. That takes two pairs, and leaves two blades of the other rotation as spares.

How many pairs re-blade the whole aircraft? Six. The T20 and T16 have six rotors with two blades each, which is twelve blades — six CW and six CCW.

Which aircraft do they fit? They are identified for the DJI Agras T20 and T16. Pick the variant for the aircraft you fly.

Do they fit the T20P? They are identified only for the T20 and T16. The T20P is a different aircraft; do not fit these on the strength of a similar look.

What does 3390 mean? It is the size designation in the part name. Exact dimensions are not published for this part, so match against the blade you removed.

How do I tell a CW blade from a CCW blade? They are mirror images. Hold the new blade next to the sound blade on the same rotor: the twist and the leading edge should run the same way. The two blades on one rotor are always the same hand.

Can a wrong-hand blade be fitted by mistake? Yes. Both blades share the same root and pivot, so a wrong-hand blade can bolt into the clamp. It will then work against its partner. Check the hand before powering up.

What is the DJI part number? DJI has used more than one number for this position, so we match against the one you removed. Photograph the damaged blade next to a sound one and send it to us if you want that confirmed.

My rotor shakes. Is it the blades? Possibly. Check the pivot bolt, the clamp, the motor shaft and the arm joint first, and clean both blades. If the vibration follows a blade when you swap the two on that rotor, the blade is the fault.

Can I replace just one blade on a rotor? Yes, with a blade of the same rotation, if the remaining blade on that rotor is undamaged. If the remaining blade has chips or worn edges, replace both.

Are the pivot bolts included? No. The pair is the two blades only. Reuse sound original pivot hardware or replace worn bolts, nuts and washers separately.

Is the propeller clamp included? No. The clamp or holder on the motor is a separate part.

Is there a torque value for the pivot bolt? DJI does not publish one for these fixings. Tighten until the blade is held without play and still folds under firm hand pressure.

Is there a service interval? No. Inspect the blades before every flight and replace any that are chipped, cracked, delaminated or worn at the tip.

What spares should I carry? Carry blades as pairs so you always have one of each rotation. If you fly near trees or wires, carry enough pairs to re-blade a whole rotor of either hand.