DJI Agras T40 OEM Centrifugal Sprinkler Thumb Nut (6 Pcs)

The DJI Agras T40 OEM Centrifugal Sprinkler Thumb Nut (6 Pcs) is a set of six hand-tightened wing-head fasteners used on the centrifugal sprinkler of the aircraft's spray system. Each one has a polished metal wing head that the fingers turn, a short threaded stud below it, and a washer seated under the head, so the sprinkler can be fastened and released at the boom without reaching for a tool. They belong to the spraying system, not to the airframe, propulsion or flight-control systems, and they are identified for the DJI Agras T40 and T20P. Operators usually find them while searching for a T40 sprinkler wing nut, a T20P centrifugal nozzle thumb screw, a lost sprinkler nut after cleaning, or a hand-twist nut for the T40 centrifugal nozzle. 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, centrifugal sprinkler position
• Matched by wing-head shape, stud length and washer against the thumb nut you removed
• Genuine DJI OEM spray system hardware, brand new, six pieces

The T40/T20P sprinkler thumb nut, the T50 thumb nut and the T100 sprinkler thumb nut are separate parts for separate aircraft. If you want the match confirmed, photograph one of your remaining nuts from the side, so the stud and washer show, and send it to us — we will match it for you.

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📦 Package Includes

• 6 × Centrifugal Sprinkler Thumb Nut — wing head, threaded stud and washer under the head

This is a set of six fasteners. Each thumb nut is a single piece of hardware with its washer; the set is not an assembly and not a sprinkler kit.

Not included: the centrifugal sprinkler itself, the sprinkler motor, the atomizing disc, the sprinkler mount or boom bracket, hoses, hose clamps, O-rings, seals, cables and any tools.

Nothing is included because it appears near the thumb nuts on the aircraft. If a different fastener on the sprinkler is missing, tell us where it sat and we will help you identify it.

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🔧 Component Overview

The centrifugal sprinkler thumb nut is the small, bright metal fastener an operator touches every time the sprinkler comes off for cleaning. It has two flat wings on a round boss, a threaded stud that runs down from the centre, and a washer that sits between the head and whatever it clamps. It is turned by thumb and finger, which is the point of it.

Its shape tells you its job. The part has three working areas:

• The wing head — two polished, rounded wings that give the fingers enough leverage to tighten and release the nut without a driver or a spanner
• The threaded stud — the short threaded section that engages the sprinkler hardware and carries the clamping load
• The washer — the ring under the head that spreads the clamping load and gives the head a flat face to bear against

Because these nuts are made to come off by hand, they come off often. Centrifugal sprinklers are cleaned, inspected and refitted far more often than most parts of the aircraft, and each of those jobs puts the thumb nuts in an operator's hand, on a tailgate, in a pocket or in the grass.

Over a working season the thumb nuts see:

• Chemical residue and wash water on every job
• Vibration from the spinning sprinkler and from the aircraft itself
• Repeated removal and refitting during sprinkler cleaning
• Tightening with pliers by operators in a hurry, which bends wings and galls threads
• Loss in the field when a nut is set down during cleaning and not found again
• Dried residue that locks a nut onto its thread between jobs
• Heat on the trailer and in the sun between flights

Thumb nuts in this position are usually replaced for one of three reasons: one has been lost, one has been damaged by a tool, or one has backed off in flight and has not been noticed. The last of those is the one most often missed, and it is the one this part's diagnosis is built around.

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⚙️ Functional Purpose

The thumb nut's engineering role is retention. It holds the centrifugal sprinkler hardware firmly in place under hand-tightened clamping load, so the sprinkler stays where it was fitted while it spins and while the aircraft flies.

In the spray system it:

• Clamps the centrifugal sprinkler hardware at its fixing point
• Lets the sprinkler be released and refitted by hand for cleaning and inspection
• Spreads its clamping load through the washer under its head
• Holds the fixing steady against sprinkler and aircraft vibration
• Keeps the cleaning routine tool-free in the field

What it does not do matters as much:

• It does not drive, power or control the sprinkler; the sprinkler motor and its electronics do that
• It does not atomize spray or set droplet size; the spinning disc and the flight settings do that
• It does not seal liquid; hoses, clamps and seals keep the spray mix inside the system
• It carries no wiring and has no electrical function
• It is not the T50 thumb nut or the T100 sprinkler thumb nut, which belong to different aircraft

That division of labour is why a missing or loose thumb nut rarely grounds the aircraft outright. It is also why its symptoms get credited to the parts it holds.

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🔍 Diagnosis — a sprinkler that is not held still looks like a sprinkler that is failing

A centrifugal sprinkler that rattles, vibrates or throws an uneven pattern sends most people straight to the expensive parts: the motor, the bearing, the disc. Those parts can fail. But a thumb nut that has backed off produces many of the same complaints, and it costs a minute to rule out.

The reason is simple. The sprinkler spins, and anything spinning that is not clamped firmly will move on its fixing. A thumb nut that has worked loose still sits on its thread, so at a glance it looks fitted. It is just not holding anything any more. The sprinkler shifts on its fixing, the vibration grows, and the symptom reads as a sprinkler fault.

Left alone, a loose thumb nut does not stay loose. It walks off its thread in flight and is gone, and the fixing it held then wears against the parts around it. A one-minute check becomes a lost nut and a worn fixing a few jobs later.

Signs a thumb nut has backed off:

• A thumb nut that turns freely by finger without any tightening resistance
• A visible gap between the washer and the face it should bear against
• A sprinkler that can be rocked by hand on its fixing
• New rattling or vibration from one sprinkler that was not there on the previous job
• One sprinkler pattern that looks different from the others on the same aircraft
• A bright wear mark on the face under a washer, where the head has been moving

Before condemning the sprinkler, rule out what imitates it:

• A loose or missing thumb nut — check every thumb nut on every sprinkler by hand; this is the cheapest check on the spray system
• Residue built up on the disc — an unevenly fouled disc runs out of balance; clean it and test again
• A damaged or bent atomizing disc — a disc that has struck something wobbles whatever holds it
• A worn sprinkler motor or bearing — rough rotation by hand with the sprinkler held firmly points at the motor, not the fastener

Use the other sprinklers as your reference. With the aircraft powered down, try each thumb nut by hand. A correctly fitted nut needs a deliberate turn to move; a backed-off one spins. Compare the washer seating on the suspect sprinkler with the ones that behave.

Clear those checks first, while the sprinkler is still on the aircraft and that information is still cheap. If a thumb nut is missing, has bent wings, has damaged threads, or will not stay tight, replace it rather than flying on it.

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⚠️ Common Replacement Indicators

Replace a thumb nut when inspection confirms one of these:

• The nut is missing after cleaning, transport or a flight
• A wing is bent, cracked or flattened from tightening with pliers
• The stud threads are galled, flattened or cross-threaded
• The nut will not hold its tightness and backs off again after refitting
• The washer is missing, distorted or no longer sits flat under the head
• Corrosion or residue that will not clean off the thread
• A head that slips on its stud or wobbles on it

Inspect these first, because they produce similar symptoms:

• The atomizing disc, for residue build-up and impact damage
• The sprinkler motor and its bearing, by turning the disc by hand
• The sprinkler mount and boom fixing for cracks
• The mating thread or fixing the thumb nut engages

There is no published service interval for these thumb nuts. They are replaced when they are lost, damaged or will not hold, not on a schedule. A set of six means a spare is on hand when one goes missing in the field.

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📐 Specifications

Product name: DJI Agras T40 OEM Centrifugal Sprinkler Thumb Nut (6 Pcs)

DJI family: Agras

Primary aircraft: DJI Agras T40

Also identified for: DJI Agras T20P

Fitment basis: Identified for the DJI Agras T40 and T20P

Aircraft system: Spraying — centrifugal sprinkler hardware

Component type: Hand-tightened wing-head thumb nut

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

Quantity: 6 thumb nuts

Form: Polished wing head with two rounded wings, threaded stud below the head, washer seated under the head

Material: Metal, polished finish; grade not published for this part

Colour: Bright polished silver

Thread size: Not published for this part

Dimensions: Not published for this part

Weight: Not published for this part

Electrical: None — mechanical fastener with no wiring

Connector: None

Mounting position: Centrifugal sprinkler fixing on the spray boom

Installation method: Threaded on and tightened by hand

Hardware included: Six thumb nuts, each with its washer

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 spray system hardware

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🛠️ Installation & Maintenance

Before installation

• Power the aircraft down and remove the battery
• Rinse the sprinkler and its fixing so you are not working in chemical residue
• Wear gloves; the nuts and fixings carry spray residue
• Photograph the sprinkler in place, so the fixing and any hoses are on record
• Compare a new thumb nut with one of your remaining nuts: wing shape, stud length and washer
• Work over a tray or a cloth so a nut that drops cannot roll away

During installation

• Remove any damaged thumb nut by hand; if residue has locked it, soak and clean it rather than forcing it with pliers
• Clean the mating thread and the face the washer bears against
• Check the mating thread for damage; a new nut will not hold on a stripped thread
• Seat the washer under the head and start the thread by hand, square, without forcing
• Tighten by hand until the washer seats firmly; DJI does not publish a torque figure for this fastener, so do not use pliers or a spanner on the wings
• Fit the remaining nuts on that sprinkler the same way, so the clamping is even

After installation

• Try the sprinkler by hand; it should not rock on its fixing
• Try each thumb nut; it should need a deliberate turn to move
• Check that hoses and cables near the sprinkler are clear of the spinning disc
• Run the sprinkler briefly with the aircraft safely restrained and listen for rattles
• Check the thumb nuts again after the first job
• Store the spare nuts somewhere they will be found in the field

Maintenance between jobs. Each time the sprinklers are cleaned, wipe residue off the thumb nut threads and washers before refitting, so they do not lock on between jobs. Never tighten them with a tool. After any job where a sprinkler sounded different, try every thumb nut by hand before the next flight — a nut that spins is the cheapest early warning this part gives.

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🚜 Necessary For

These thumb nuts are for operators and technicians who keep T40 and T20P centrifugal sprinklers clean and fastened:

• DJI Agras T40 operators who have lost a sprinkler thumb nut during cleaning
• DJI Agras T20P operators (identified fitment)
• Commercial spray applicators who clean sprinklers every day and want spares on the trailer
• Agras service centres and repair technicians restoring spray systems
• Fleet managers replacing thumb nuts damaged by pliers
• Growers flying their own aircraft who want the sprinklers held firmly again

This is not the part you need if:

• You fly a T50 — the part you need is the DJI Agras T50 OEM Thumb Nut (12 Pcs)
• You fly a T100 — the part you need is the DJI Agras T100 OEM Centrifugal Sprinkler Thumb Nut
• The thumb nuts are tight and the sprinkler still vibrates — check the disc, then the sprinkler motor and its bearing
• The mating thread on the sprinkler fixing is stripped — a new nut will not hold on a damaged thread
• A hose, clamp or seal is leaking — those are separate spray system parts
• You fly a T10, T30 or T25 — these thumb nuts are identified only for the T40 and T20P

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💡 Why This Part Matters

The sprinkler thumb nut is easy to overlook because the aircraft flies with a loose one. It does not throw an error, and it does not stop the sprinkler. It simply stops holding the sprinkler still.

That is the whole case for checking and replacing it rather than living with it. A sprinkler that is not held firmly vibrates, and that vibration gets blamed on the motor, the bearing or the disc. Time goes into the wrong parts while a backed-off nut walks the rest of the way off its thread.

The thumb nut is also the part most likely to go missing in the field, because it is designed to be removed by hand during cleaning. Six in the set means the sprinkler is not left fastened with a missing nut while a replacement is found.

The check is free. With the aircraft powered down, try every thumb nut by hand. If each one needs a deliberate turn to move, leave them. If one spins, has bent wings or will not hold, this is the part that holds the sprinkler again.

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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 Centrifugal Sprinkler Thumb Nut (6 Pcs)

Brand: DJI

DJI family: Agras

Primary aircraft: DJI Agras T40

Also identified for: DJI Agras T20P

Compatible models: DJI Agras T40; DJI Agras T20P

Fitment basis: Identified for the DJI Agras T40 and T20P

Component: Centrifugal sprinkler thumb nut

Aircraft system: Spraying

Installed position: Centrifugal sprinkler fixing on the spray boom

Primary function: Holds the centrifugal sprinkler hardware firmly under hand-tightened clamping load and allows tool-free removal for cleaning

Form: Polished metal wing head, threaded stud, washer under the head

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

Quantity supplied: 6 thumb nuts

Not included: Centrifugal sprinkler, sprinkler motor, atomizing disc, sprinkler mount, hoses, clamps, seals, tools

Electrical function: None

Tightening method: By hand; no published torque figure

Key diagnostic: A sprinkler that rattles or vibrates may have a backed-off thumb nut; try each nut by hand before suspecting the motor, bearing or disc

Common failure modes: Lost during cleaning, wings bent by pliers, galled threads, backed off in flight

Service interval: None published

Service adjustability: None

Condition: Brand new

Part classification: DJI OEM spray system hardware

Also searched as: T40 sprinkler thumb nut; T40 centrifugal nozzle wing nut; T20P sprinkler thumb screw; Agras T40 hand twist nut; T40 sprinkler hand-tightened nut; DJI Agras T20P/T40 centrifugal sprinkler thumb nut

Disambiguation: Not the DJI Agras T50 OEM Thumb Nut (12 Pcs), not the DJI Agras T100 OEM Centrifugal Sprinkler Thumb Nut, not a sprinkler motor, disc or mount

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 centrifugal sprinkler thumb nut? A hand-tightened fastener with a polished metal wing head, a threaded stud and a washer under the head, used on the centrifugal sprinkler so it can be fastened and released without tools. This set has six.

How many thumb nuts come in the set? Six. Each one has its washer. The sprinkler, disc, motor and mount are not included.

Which aircraft do they fit? They are identified for the DJI Agras T40 and T20P. Pick the variant for the aircraft you fly.

I fly a T50. Are these the right nuts? No. For the T50 you need the DJI Agras T50 OEM Thumb Nut (12 Pcs), which is a separate part.

I fly a T100. Are these the right nuts? No. For the T100 you need the DJI Agras T100 OEM Centrifugal Sprinkler Thumb Nut, which is a separate part.

Are these thumb nuts or thumb screws? They are called thumb nuts in the part designation, but each one has a threaded stud below a wing head, so some operators call them thumb screws or wing screws. It is the same part.

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 one of your remaining nuts from the side and send it to us if you want that confirmed.

My sprinkler rattles. Is it the motor? Possibly, but try every thumb nut by hand first. A backed-off thumb nut lets the sprinkler move on its fixing and can feel like a motor or bearing fault. Then check the disc for residue and damage before suspecting the motor.

Can I tighten them with pliers? No. They are made to be tightened by hand. Pliers bend the wings and gall the threads, which is one of the main reasons these nuts get replaced.

What torque should I use? DJI does not publish a torque figure for this fastener. Tighten by hand until the washer seats firmly and the nut needs a deliberate turn to move.

What thread size are they? The thread size is not published for this part. Compare a new nut with one of your remaining nuts, or send us a photograph and we will match it.

Why do these go missing so often? They come off by hand every time the sprinkler is cleaned, so they get set down on tailgates, in pockets and in the grass. Keep the spares in the set somewhere you will find them in the field.

Will a new thumb nut fix a stripped thread on the sprinkler? No. A new nut needs a sound mating thread to hold. If that thread is damaged, the fixing it belongs to needs attention.

Can I fit them myself? Yes. Clean the thread, seat the washer under the head, start the thread by hand, tighten by hand until the washer seats, and check each nut again after the first job.

Is there a service interval? No. Replace a thumb nut when it is lost, its wings or threads are damaged, or it will not stay tight. Try them by hand every time the sprinkler is cleaned.

Do they fit the T30 or T10? They are identified only for the T40 and T20P. Do not fit them to other Agras models on the strength of a similar shape.