DJI Agras T40 OEM Aircraft Arm Friction Plate Set

The DJI Agras T40 OEM Aircraft Arm Friction Plate Set is a pair of flat black friction plates for the aircraft arm, supplied as one of each shape: a tall plate with a rounded top corner and a large round hole, and a shorter angled plate with a sloping top edge and a small round hole near its upper corner. They belong to the frame and arm hardware of the aircraft, not to the spray, power or flight-control systems, and they are identified for the DJI Agras T40 and T20P. Operators usually come looking for them while searching for a T40 arm friction plate, a T20P arm friction pad, a missing plate found during arm service, or a replacement for a plate that has cracked, torn or worn at its hole. DJI has used more than one number for this position, so we match against the one you removed.

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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 T40 / DJI Agras T20P Compatibility Guarantee

• 🇺🇸 USA Compatibility Guarantee
• 👍🏻 Satisfaction Guarantee
• 💵 Money Back Guarantee
• 📦 Same Day Shipping & Tracking
• Identified for the DJI Agras T40 and T20P, aircraft arm position
• Matched by outline, hole size and hole position against the plates you removed
• Genuine DJI OEM frame and arm hardware, brand new

The two plates in the set are different parts with different outlines and different hole sizes. If you want the match confirmed, lay the plates you removed flat on a plain surface beside a ruler, photograph them square-on, and send the photograph to us — we will match each one for you.

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📦 Package Includes

• 1 × tall arm friction plate — flat, black, rounded at one top corner, with a large round hole near the top
• 1 × angled arm friction plate — flat, black, with a sloping top edge and a small round hole near its upper corner

This set is two plates, one of each shape. It is not two identical plates, and it is not a multi-pack of either shape. The two plates together make one set as shown in the product images.

Not included: the aircraft arm, the arm connector, the arm locking rotation shaft, arm-fold or arm-lock hardware, screws, washers, bushings, adhesive, motors, propellers, and any cables that run along the arm. Each of those is a separate part.

How many sets a given aircraft uses, and at which arms, is not published for this part. Count the plates you remove, note which shape came from where, and compare them against the set. If a plate is missing from your removed assembly and you are not sure which one it was, tell us what you have left and we will help you identify it.

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🔧 Component Overview

An arm friction plate is a thin, flat piece of hardware. It has no moving parts, no wiring and no adjustment. What it has is an outline and a hole, and those two features are the whole of its identity: the outline decides where it can sit, and the hole decides what passes through it.

The set contains two plates that look like relatives and are not twins. Laid side by side they are easy to tell apart:

• The tall plate — the larger of the two, upright and roughly rectangular, with one top corner cut at an angle and the other rounded, and a large round hole set close to the top
• The angled plate — shorter and wider, with a long sloping top edge running up to a rounded corner, and a small round hole set in that upper corner
• Both plates — flat, black, plain-faced, with no printed markings visible in the product images

The part designation places them at the aircraft arm. A friction plate's job in any mechanical joint is to sit between two surfaces that bear against each other, so that they bear on the plate rather than directly on each other. That makes the plates the sacrificial layer in the joint: they take the rubbing and the clamping so that the moulded or machined faces either side of them do not.

Over a working season arm hardware sees:

• Arm folding and unfolding at the start and end of every working day
• Transport on trailers and in vehicles with the arms folded
• Vibration through the frame on every flight
• Arm strikes against trees, posts, trailers and vehicles during handling
• Chemical residue and wash water that run down the arms and collect at the joints
• Heat on the trailer and in the sun between flights
• Repeated disassembly of the arm joint during service and crash repair

Plates in this position usually come out for one of four reasons: a plate has cracked or torn, a hole has worn out of round, a plate has been distorted by an impact or by clamping, or a plate has simply gone missing during an earlier arm repair. The last one is more common than it sounds. A thin black plate that drops out of an arm joint onto a dark workshop floor is easy to lose and easy not to notice.

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⚙️ Functional Purpose

The plates' engineering role is to be the controlled contact surface in the arm hardware. They sit where the part designation puts them, at the aircraft arm, and they give the surfaces around them a defined, replaceable layer to bear against.

In the arm hardware they:

• Provide a flat bearing layer between surfaces that would otherwise contact each other directly
• Locate on whatever passes through their holes, so each plate sits in one place and one orientation
• Take the rubbing and clamping load that would otherwise wear the faces either side
• Fill the space they were designed to fill, so the parts around them sit at the spacing DJI intended
• Can be replaced on their own when worn, without replacing the arm or the parts they protect

What they do not do matters as much:

• They do not carry the aircraft in flight; the arms and arm connectors do that
• They are not the arm locking rotation shaft, which is a separate part sold as its own pack
• They do not latch, lock or fold the arm on their own
• They carry no wiring and have no electrical function
• They do not seal the arm against liquid
• They will not straighten a bent arm or close up a cracked arm connector

That is why a missing or worn plate rarely grounds the aircraft outright, and why it is so often left out of an arm repair that otherwise looks finished.

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🔍 Diagnosis — the outline and the hole name the plate, so match both before you fit either

The most common mistake with these plates is not a failed part. It is a correct part in the wrong place, or the same shape fitted twice. Two flat black plates of similar size come out of an arm joint together; one goes back where the other came from, or a second copy of one shape is pressed into service because it was what was in the parts tray. The joint goes back together, and it is wrong.

The plates prevent that themselves, if you read them. The tall plate carries a large hole; the angled plate carries a small one. Whatever passes through each plate's hole decides which plate belongs there. A small-hole plate cannot sit on a large-diameter part, and a large-hole plate slid over a small one has nothing locating it — it can shift, sit off-centre and wear unevenly. Matching the outline alone is not enough. Match the outline and the hole.

That is also why the set is one of each shape. A pair of identical plates would leave one position wrongly filled. Replacing both at once, from one set, keeps the two plates in a joint at the same state of wear.

Signs a plate needs attention:

• A plate that is cracked, torn, chipped at its edge, or split from its hole
• A hole that has worn oval or ragged rather than round
• A plate that is bent, dished or no longer lies flat
• A plate that is visibly thinner on one side than the other
• A plate missing from the joint when the arm is opened up
• One arm joint that feels or sounds different from the others when the arms are folded and unfolded

Before blaming the plates, rule out what imitates them:

• The arm locking rotation shaft — a worn or damaged shaft lets the arm move no matter how good the plates are
• The arm connector — a cracked or loosened connector produces play at the arm root that new plates will not remove
• A loose or missing fastener — one backed-off screw changes the clamping on every part in the joint
• A bent arm — if the arm itself is out of line, the joint will not sit square however it is assembled

Use the other arms as your reference. Fold and unfold each arm by hand and compare how they feel and sound. When the suspect arm is opened up, compare its plates with the plates from a sound arm: same shapes, same hole sizes, same thickness by eye, same flatness on a straightedge. Any difference between them is wear or damage, not design.

Do those checks first, while the joint is already open and that information is still cheap. If a plate is cracked, torn, distorted, worn at the hole or missing, replace the set rather than reassembling the joint around it.

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⚠️ Common Replacement Indicators

Replace the arm friction plate set when inspection confirms one of these:

• A crack or tear in either plate, at the hole or at the edge
• A hole worn oval, ragged or enlarged
• A plate that is bent, dished or no longer lies flat
• Uneven thinning across a plate's face
• A plate missing after earlier arm service
• Two plates of the same shape found in one joint
• Chemical staining or residue that has softened or swollen a plate
• An arm joint that still feels different from the others after the shaft, connector and fasteners have been checked

Inspect these first, because they produce similar symptoms:

• The arm locking rotation shaft
• The arm connector at the arm root
• Screws and washers in the arm joint
• The arm tube itself, for bends or cracks
• Cables along the arm that may be trapped in the joint

There is no published service interval for these plates. They are replaced when they are worn, damaged, distorted or missing, not on a schedule.

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📐 Specifications

Product name: DJI Agras T40 OEM Aircraft Arm Friction Plate Set

DJI family: Agras

Primary aircraft: DJI Agras T40

Also listed for: DJI Agras T20P

Fitment basis: Identified for the DJI Agras T40 and T20P

Aircraft system: Frame — aircraft arm hardware

Component type: Flat friction plates, set of two

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

Quantity: 2 plates — 1 tall plate with a large hole, 1 angled plate with a small hole

Form: Tall plate: upright outline with one angled and one rounded top corner, large round hole near the top. Angled plate: shorter outline with a sloping top edge, small round hole in the upper corner

Material: Not published for this part

Colour: Black

Dimensions: Not published for this part

Thickness: Not published for this part

Hole diameters: Not published for this part

Weight: Not published for this part

Electrical: None — mechanical part with no wiring

Connector: None

Mounting position: Aircraft arm, as named in the part designation

Installation method: Fitted into the arm hardware in the positions and orientation of the plates removed

Hardware included: None — screws, washers and shafts are not supplied

Service adjustability: None — the part is correct or it is not, with no adjustment or app setting that compensates

Condition: Brand new

Classification: DJI OEM frame and arm hardware

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🛠️ Installation & Maintenance

Before installation

• Power the aircraft down and remove the battery
• Rinse and dry the arm and joint so you are not working in chemical residue
• Photograph the arm joint from each side before opening it, so the arrangement of parts is on record
• As the joint comes apart, photograph each plate in place before lifting it out, with its orientation visible
• Lay out a tray with separate spots for each plate and each fastener, labelled by position
• Lay the new plates beside the removed ones and match each by outline and by hole size

During installation

• Remove only the parts needed to reach the plates, in the order they came out
• Clean the faces the plates sit against and check them for scoring, cracks or residue
• Check the arm locking rotation shaft and the arm connector while they are exposed
• Fit the tall, large-hole plate only where a large-hole plate came out, and the angled, small-hole plate only where a small-hole plate came out
• Match each plate's orientation to your photographs; a flat plate can go in face-up or face-down, so look at the outline, not the face
• Make sure each plate lies flat and is located on its hole, not trapped against an edge
• Start every screw by hand, then tighten evenly; DJI does not publish a torque figure for these fixings, so snug them without distorting the plates
• Re-route any cables exactly as your photographs show

After installation

• Fold and unfold the arm through its full travel by hand and compare its feel with the other arms
• Check that the arm locks fully in the flight position
• Look and listen for rubbing or catching at the joint
• Run a short hover and listen for new noises from the arm
• Inspect the joint again after the first working day
• Record the replacement in the maintenance log

Maintenance between jobs. Rinse residue off the arm joints as part of the normal wash-down, so it does not dry into the plates. Each time an arm joint is opened, look at both plates for cracks, hole wear and flatness. Keep a spare set in the service kit; these plates are small and easily lost during field repairs, and a joint reassembled without one is a joint that will need opening again.

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🚜 Necessary For

This set is for operators and technicians who have an arm joint open on a T40 or T20P:

• DJI Agras T40 operators rebuilding an arm joint after a strike or hard landing
• DJI Agras T20P operators (identified fitment)
• Commercial spray applicators who fold and unfold their arms every working day
• Agras service centres and repair technicians reassembling arms after crash repair
• Fleet managers who want a spare set in every service kit
• Growers flying their own aircraft who found a plate cracked or missing during service

This is not the part you need if:

• The arm moves because the shaft is worn or damaged — you need the arm locking rotation shaft, which is a separate part sold as its own pack
• The arm root is cracked or loose at the body — you need the arm connector, not plates
• The arm tube itself is bent or cracked — you need the aircraft arm assembly; new plates will not straighten it
• You need several plates of one shape — this set is one of each shape, not a multi-pack of either
• The plates you removed are sound, flat and round at the hole — reuse them and look elsewhere for the fault
• You fly a T50, T25, T100 or T70P — this set is listed only for the T40 and T20P

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💡 Why This Part Matters

These plates are easy to undervalue because the aircraft will fly without them, or with the wrong one in place. Nothing throws an error. The arm still unfolds and still locks. The joint simply runs with a contact surface missing, misplaced or doubled up.

The case for a matched set is about naming, not strength. The two plates are different parts. One has a large hole and one has a small one, and the hole decides where each plate goes. A set that contains one of each shape puts the right plate back in each position; two of the same shape, or one new plate beside one worn one, does not.

When the plates are wrong, the wear does not stay in the plates. The surfaces they were meant to protect start to bear on each other, or on a plate that is not located on its hole. That moves the wear onto the shaft, the connector and the moulded faces of the arm hardware, and each of those is a larger repair than a pair of plates.

The check costs nothing while the joint is open. Lay the removed plates flat, compare their outlines and holes with the new set and with a sound arm, and fit each plate only where its shape and hole belong. If the removed plates are flat, whole and round at the hole, leave them in. If they are not, this is the set that puts both positions back.

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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 T40 OEM Aircraft Arm Friction Plate Set

Brand: DJI

DJI family: Agras

Primary aircraft: DJI Agras T40

Also listed for: DJI Agras T20P

Compatible models: DJI Agras T40; DJI Agras T20P

Fitment basis: Identified for the DJI Agras T40 and T20P

Component: Aircraft arm friction plate set

Aircraft system: Frame — arm hardware

Installed position: Aircraft arm, as named in the part designation

Primary function: Provides a flat, replaceable contact layer between bearing surfaces in the arm hardware

Form: Two flat black plates: one tall plate with a large round hole, one angled plate with a small round hole

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

Quantity supplied: 2 plates, one of each shape

Not included: Aircraft arm, arm connector, arm locking rotation shaft, screws, washers, bushings

Material: Not published for this part

Dimensions: Not published for this part

Electrical function: None

Key diagnostic: Match each plate by outline and hole size; the large-hole plate and the small-hole plate are not interchangeable

Common failure modes: Cracked or torn plate, hole worn out of round, distorted plate, plate lost during arm service

Service interval: None published

Service adjustability: None

Condition: Brand new

Part classification: DJI OEM frame and arm hardware

Also searched as: T40 arm friction plate; T20P arm friction plate; Agras T40 arm friction pad; T40 arm joint plate; DJI Agras T20P/T40 aircraft arm friction plate

Disambiguation: Not the arm locking rotation shaft, not an arm connector, not an aircraft arm assembly, not a multi-pack of one plate shape

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 the DJI Agras T40 aircraft arm friction plate set? Two flat black friction plates for the aircraft arm, one of each shape: a tall plate with a large round hole and a shorter angled plate with a small round hole. They are identified for the DJI Agras T40 and T20P.

How many plates are in the set? Two. One tall, large-hole plate and one angled, small-hole plate. It is not two of the same shape.

Are the two plates interchangeable? No. They have different outlines and different hole sizes, and the hole decides which part each plate sits on. Fit the large-hole plate only where a large-hole plate came out, and the small-hole plate only where a small-hole plate came out.

Which aircraft does it fit? It is identified for the DJI Agras T40 and T20P. Pick the variant for the aircraft you fly.

Is the T20P set different from the T40 set? The set is identified for both aircraft. The variant records which one you fly so the match is made against the right airframe, and we compare it with the plates you removed if you send a photograph.

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 your old plates flat beside a ruler and send it to us if you want that confirmed.

How many sets does my aircraft need? That is not published for this part. Count the plates in each arm joint you open, note which shape came from where, and order one set for each pair of plates you are replacing.

My arm feels loose. Is it the friction plates? Possibly, but check the arm locking rotation shaft, the arm connector and the joint fasteners first; each of those produces play that new plates will not remove. Then compare the suspect arm's plates with those from a sound arm.

Is this the arm locking rotation shaft? No. The arm locking rotation shaft is a separate part sold as its own pack. This set is the two flat plates only.

I found a plate missing after an earlier repair. Do I need the whole set? Replacing both plates from one set keeps the joint at a single state of wear and makes sure each position gets the correct shape. If the remaining plate is sound you can keep it as a spare.

What are the plates made of, and how thick are they? Material, thickness and dimensions are not published for this part. Compare the new plates with the ones you removed by outline, hole size and flatness.

Are screws or washers included? No. The set is the two plates only. Reuse sound original fasteners, or replace any with damaged threads or heads separately.

Will new plates fix a bent arm? No. The plates are a contact layer in the joint; they do not straighten an arm or close up a cracked arm connector. Those parts need attention first.

Does it fit the T50 or T25? It is listed only for the T40 and T20P. Do not fit it to other Agras models on the strength of a similar shape.

Can I fit them myself? Most operators can. Photograph each plate in place before removal, keep parts grouped by position, match each new plate by outline and hole, tighten evenly without distorting the plates, and test the arm fold by hand before flying.

Is there a service interval? No. Replace the plates when they are cracked, torn, distorted, worn at the hole or missing. Look at them every time an arm joint is opened.