Attachments for the Kubota KX121-3α weight range
- Bucket line
- GP - general purpose digging bucket300–600 mm wide
- We usually reply within 1 working day
- We check the fit before we send the quote
- Every offer names the dispatch week
- If a bracket we made is wrong and does not fit your machine, we replace it.
How is the attachment mounted on this machine?
Tell us what is on the machine now. It narrows the sizes we show and goes with your enquiry. It does not confirm fit: we check the bracket before we send the quote.
Catalogue sizes for the KX121-3α
Each size below has a catalogue row rated for a carrier of 3,980 kg operating weight. Tell us which sizes you want and we reply with an offer.
Each family shows its candidate models by operating-weight range.
The attachments buyers in your market ask for first, sized for the KX121-3α.
On a narrow screen the table scrolls sideways.
Buckets
Tools
| Attachment | Sizes | Heaped capacity ISO 7451 [dm³] | Width [mm] | Weight [kg] |
|---|---|---|---|---|
Other mini-ex attachments | ||||
| LR mini - straight land rakes for mini-excavator | LR-4 · 2 width variants | 1,000–1,200 | 127–150 | |
| LRS - short land rakes for mini-excavators | LRS-5 | 1,560 | 130 | |
| RIP mini - ripper shank for mini-excavator | Ripper-5.5 | 51 | ||
| MR mini - multi-ripper for mini-excavator | MRF 40 · 2 width variants | 600–800 | 62–69 | |
| AC mini - asphalt cutter for mini-excavator | AC-6 | 43 | ||
| GRB light - mini-excavator grading beam with lowered mass | GRB-MIKRO · 3 width variants, GRBH-MIKRO · 3 width variants | 1,500–2,000 | 86–141 | |
Non-bucket attachments | ||||
| DuoRIP - double ripper for root extraction | Duo-Ripper-6 | 365 | 102 | |
| GRB - excavator grading beam | GRB-MINI · 4 variants, GRBH-MINI · 2 width variants | 1,000–1,500 | 91–261 | |
Also available | ||||
| RC - root cutter | Root cutter-2 | 170 | 13 | |
| RRB - root rake bucket profile | RRB-40 | 1,200 | 148 | |
Quick couplers
| Attachment | Sizes | Heaped capacity ISO 7451 [dm³] | Width [mm] | Weight [kg] |
|---|---|---|---|---|
| QC-S - S-System Scandinavian quick-couplerStart herePrice & lead timeGet price & lead timeS-System (Scandinavian) | QC-S40-H, QC-S40-H/240, QC-S40-SA, QC-S40-SA/240, QC-U-S40-H, QC-U-S40-H/240 | 30–92 | ||
| CW - CW-System compatible quick-couplerCW-System | CW-10, CW-U-10 | 65–179 | ||
| QC-HS / QC-MS - MS-System compatible quick-couplerMS system | QC-HS-03, QC-MS-03, QC-U-HS-03 | 30–90 | ||
| QC-PG - pin-grabber quick-coupler for factory bracketsPin-grabber | QC-ML-M-40 | 32 |
Welded to EN ISO 3834-2. Agree it as a standing term of supply and the EN 10204 3.1 certificate ships with every attachment. You also get the CE declaration of conformity for every attachment. See the certificates.
Message us on WhatsAppPhotos and voice notes are welcome.Which coupler is on your machine?
Pick the system on your machine and we put it in your enquiry. We check the bracket before we send the quote.
How to measure your coupler
Not sure which system it is? Three measurements tell us which bracket you need.
- Measure the diameter of both pins.
- Measure the distance between the pin centres.
- Measure the width between the inside faces of the ears.
If the coupler has a make or type printed on it, send that too.
Before you order: check the interface
The weight class of the Kubota KX121-3α sizes the attachment. It does not tell you the pin diameter, the pin spacing or the stick width, and those decide whether an attachment fits. Measure them on the machine, or send us the measurements of the bucket it runs today.
On a mini excavator the weight of the attachment counts for more than on a larger machine, because every kilogram of bucket is taken from lift capacity and stability. A narrow trenching bucket and a wide grading bucket are the usual pair, and many machines run a small quick coupler to change between them.
Quick coupler brackets at this weight
In our model tables, the attachments listed for the Kubota KX121-3α at its weight are built with these brackets. Each code opens the models that list it.
- Measure the diameter of both bucket pins.
- Measure the distance between the pin centres.
- Measure the inside width between the stick ears.
- If the machine runs a quick coupler, note its make and type.
What these terms mean:
How to choose an attachment for the job:
Send me the spec sheet for my machine
Pick a bucket line and we email you its spec sheet, with the sizes we build for the KX121-3α.
Send this answer to a colleague or dealer
Kubota KX121-3α: GP - general purpose digging bucket (GP-40)
Sizes are matched to the published operating weight of the KX121-3α.
- Weight Class
- Mini Excavator (1–6 t)
- Operating Weight
- 3,980 kg
- Family-owned group, founded in 1996
- More than 50,000 attachments delivered
- Built in our own factory in Poland
Operating weight as published by Kubota, retrieved 2026-09-10. Source
Kubota KX121-3α: machine data
- Operating weight
- 3,980 kg
- Maximum digging depth
- 3,510 mm
- Bucket breakout force
- 32.5 kN
- Arm crowd force
- 20.5 kN
- Auxiliary circuit flow
- 60 l/min
- Auxiliary circuit pressure
- 245 bar
- Arm length
- 1,300–1,600 mmmaker's document (ke.kubota-eu.com)
- Main pump flow
- 94.5 l/minmaker's document (ke.kubota-eu.com)
- Bucket capacity
- 0.12 m³maker's document (ke.kubota-eu.com)
- Bucket width
- 600–624 mmmaker's document (ke.kubota-eu.com)
- Lift capacity
- 1,410 kgmaker's document (ke.kubota-eu.com)
As published by Kubota, retrieved 2026-09-19. Source
- Pin diameter
- 40 mmSource: Tuff Buckets, Equipment Plus, and Attachment Co.
A guide only. Measure the pins before you order.
What the KX121-3α figures mean for its attachments
- Its auxiliary circuit is rated at 60 l/min and 245 bar. A breaker, auger, tilt rotator or other hydraulic tool states the oil flow it needs, so choose one whose range includes this figure.
- The main pump delivers up to 94.5 l/min at 245 bar. That is the pump output of the whole machine, not the flow an attachment gets.
- It digs down to 3,510 mm. That is the deepest trench it can open.
- Kubota offers arms from 1,300 to 1,600 mm. A longer arm reaches further, a shorter one handles a heavier bucket.
- Kubota lists buckets from 600 to 624 mm wide for this machine.Our sizes in that range: GP - general purpose digging bucket (GP-40); GPO - GP bucket with perforated bottom (GPO-40); GPL - general purpose digging bucket (GPL-40); GPLO - GPL bucket with perforated bottom (GPLO-40); PDP mini - skeleton BDP stone bucket (PDP-40); DS mini - Scandinavian deep digging bucket for mini-excavator (DS-50); CB mini - hydraulic clamp bucket for mini-excavator (CBR-40)
- Kubota lists a bucket capacity of 0.12 m³.
- Bucket breakout force is 32.5 kN and arm crowd force 20.5 kN. That is the force a bucket or ripper works with at the tooth.
- Kubota gives a lifting capacity of 1,410 kg. Check a heavy grab or hammer, plus its load, against the full load chart.
Figures as published by Kubota in its own documents.
How the KX121-3α compares with its neighbours
The nearest models by weight, with the difference to the KX121-3α in parentheses where both makers publish the figure.
| Model | Operating weight | Max dig depth | Main pump flow | Auxiliary flow |
|---|---|---|---|---|
| KX121-3α | 3.98 t | 3,510 mm | 94.5 l/min | 60 l/min |
| Kubota KX042-4 | 4.125 t (+0.145 t) | 3,375 mm (-135) | 92.4 l/min (-2.1) | 65 l/min (+5) |
| Kubota KX042-4α | 4.15 t (+0.17 t) | 3,455 mm (-55) | 92.4 l/min (-2.1) | 65 l/min (+5) |
| Volvo ECR40 | 3.985 t (+0.005 t) | 3,727 mm (+217) | 110 l/min (+15.5) | 65 l/min (+5) |
Figures as each maker publishes them. A difference is shown only where both machines have a published value.
KX121-3α: build years and variants
Build years: 2005–2017
Variants
- KX121-3α GL (2005–2017)
Years and variants as listed in the LECTURA Specs database.
KX121-3α: what the brochure names
Features Kubota names in its own brochure for the KX121-3α. Some of them may be optional, so check the machine's spec before you order.
- A load-sensing hydraulic system.
- Operator protection certified to ROPS and FOPS.
- Two-speed travel.
- Automatic engine idle when the controls are left alone.
From Kubota's published brochure. We keep the source document on file.
Other Kubota models of a similar weight
Other makes of a similar weight
Operating weight within 2 t of the Kubota KX121-3α.
Other Kubota models with the same coupler brackets
Our model tables give these machines the same quick coupler brackets.
Why buy from the factory
- Cutting, machining, welding and painting on one site, our own factory in Poland, EU
- More than 50,000 attachments delivered since 2008
- A record for every serial number, so the spare parts match your attachment
Need Custom Specifications?
We can manufacture attachments to your exact pin spacing and requirements for Kubota KX121-3α.
Questions about the KX121-3α
- What bucket width fits the KX121-3α?
- Kubota lists buckets from 600 to 624 mm wide for it. Pick a width in that range.
- Can the KX121-3α run a hydraulic attachment?
- Yes, if the tool's rated range covers the auxiliary circuit: 60 l/min at 245 bar.
For publishers: cite or embed this table
Cite this table as https://sieruta.com/en/fit/kubota/kubota-kx121-3a, figures as of 2026-09-10.
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Machine makes and model names belong to their owners. Sieruta is not affiliated with them. We use the names only to show which machines we offer attachments for, by operating weight.