Operating-weight guide

Attachments for the JCB 370X weight range

Bucket line: DB - heavy duty digging bucket1000–1800 mm wide

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Catalogue sizes for the 370X

Each size below has a catalogue row rated for a carrier of 39,888 kg operating weight. Tell us which sizes you want and we reply with an offer.

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Attachment	Sizes	Capacity [dm³]	Width [mm]	Weight [kg]
DB - heavy duty digging bucket	DB-400 · 6 width variants	1,082–2,288 SAE	1,000–1,800	957–1,480
SDB - heavy duty skeleton DB bucket	SDB-400 · 2 width variants	1,917–2,224 SAE	1,600–1,800	1,411–1,550
DBF - flat-top digging bucket for quick coupler	DBF-400 · 6 width variants	1,024–2,179 SAE	1,000–1,800	854–1,312
RDBF - flat-top skeleton DBF bucket on rods	RDBF-400 · 3 width variants	1,727–2,179 SAE	1,500–1,800	1,067–1,213
DSX - Nordic heavy duty digging bucket	DS-HD-400 · 3 width variants	921–1,462 SAE	1,000–1,400	952–1,214
GD - rigid grading & ditching bucket, 12–40 t	GD-400 · 3 width variants	1,395–1,851 SAE	2,000–2,600	856–1,055
GDH - heavy duty hydraulic grading & ditching bucket	GDH-400 · 3 width variants	1,336–1,780 SAE	2,000–2,600	1,218–1,415
SB - Dutch profile grading & ditching bucket	SB-400 · 4 width variants	1,739–2,242 SAE	2,000–2,500	889–1,065
DCB - grading & ditching bucket with round profile	DCB-400 · 3 width variants	1,307–1,735 SAE	2,000–2,600	721–893
RIP - heavy duty ripper	Ripper-E			490
CW - CW-System compatible quick-coupler	CW-45, CW-45 S, CW-55, CW-U-45, CW-U-45 S			435–1,146
QC-HS / QC-MS - MS-System compatible quick-coupler	QC-HS-25			310
QC-PG - pin-grabber quick-coupler for factory brackets	QC-PG-100, QC-U-PG-100			740–1,435

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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 product that carries the CE mark.

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Cite this table as https://sieruta.com/en/fit/jcb/jcb-370x, figures as of 2026-09-10.

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<table>
<caption>Families that fit the JCB 370X, with their own figures</caption>
<thead><tr><th scope="col">Attachment</th><th scope="col">Sizes</th><th scope="col">Capacity [dm³]</th><th scope="col">Width [mm]</th><th scope="col">Weight [kg]</th></tr></thead>
<tbody>
<tr><td><a href="https://sieruta.com/en/products/buckets/digging/db-heavy-duty-digging-bucket">DB - heavy duty digging bucket</a></td><td>DB-400 · 6 width variants</td><td>1,082–2,288 SAE</td><td>1,000–1,800</td><td>957–1,480</td></tr>
<tr><td><a href="https://sieruta.com/en/products/buckets/digging/sdb-heavy-duty-skeleton-bucket-for-excavator">SDB - heavy duty skeleton DB bucket</a></td><td>SDB-400 · 2 width variants</td><td>1,917–2,224 SAE</td><td>1,600–1,800</td><td>1,411–1,550</td></tr>
<tr><td><a href="https://sieruta.com/en/products/buckets/digging/dbf-flat-top-digging-bucket-for-excavator-with-quick-coupler">DBF - flat-top digging bucket for quick coupler</a></td><td>DBF-400 · 6 width variants</td><td>1,024–2,179 SAE</td><td>1,000–1,800</td><td>854–1,312</td></tr>
<tr><td><a href="https://sieruta.com/en/products/buckets/digging/rdbf-flat-top-skeleton-rod-dbf-bucket">RDBF - flat-top skeleton DBF bucket on rods</a></td><td>RDBF-400 · 3 width variants</td><td>1,727–2,179 SAE</td><td>1,500–1,800</td><td>1,067–1,213</td></tr>
<tr><td><a href="https://sieruta.com/en/products/buckets/digging/ds-nordic-heavy-duty-digging-bucket">DSX - Nordic heavy duty digging bucket</a></td><td>DS-HD-400 · 3 width variants</td><td>921–1,462 SAE</td><td>1,000–1,400</td><td>952–1,214</td></tr>
<tr><td><a href="https://sieruta.com/en/products/buckets/digging/gd-rigid-grading-bucket">GD - rigid grading &amp; ditching bucket, 12–40 t</a></td><td>GD-400 · 3 width variants</td><td>1,395–1,851 SAE</td><td>2,000–2,600</td><td>856–1,055</td></tr>
<tr><td><a href="https://sieruta.com/en/products/buckets/digging/gdh-heavy-duty-hydraulic-grading-ditching-bucket">GDH - heavy duty hydraulic grading &amp; ditching bucket</a></td><td>GDH-400 · 3 width variants</td><td>1,336–1,780 SAE</td><td>2,000–2,600</td><td>1,218–1,415</td></tr>
<tr><td><a href="https://sieruta.com/en/products/buckets/digging/sb-dutch-profile-grading-ditching-bucket">SB - Dutch profile grading &amp; ditching bucket</a></td><td>SB-400 · 4 width variants</td><td>1,739–2,242 SAE</td><td>2,000–2,500</td><td>889–1,065</td></tr>
<tr><td><a href="https://sieruta.com/en/products/buckets/digging/dcb-grading-ditching-bucket-round-profile">DCB - grading &amp; ditching bucket with round profile</a></td><td>DCB-400 · 3 width variants</td><td>1,307–1,735 SAE</td><td>2,000–2,600</td><td>721–893</td></tr>
<tr><td><a href="https://sieruta.com/en/products/tools/rippers-rakes/rip-heavy-duty-ripper">RIP - heavy duty ripper</a></td><td>Ripper-E</td><td></td><td></td><td>490</td></tr>
<tr><td><a href="https://sieruta.com/en/products/quick-couplers/cw-system/cw-system-quick-coupler">CW - CW-System compatible quick-coupler</a></td><td>CW-45, CW-45 S, CW-55, CW-U-45, CW-U-45 S</td><td></td><td></td><td>435–1,146</td></tr>
<tr><td><a href="https://sieruta.com/en/products/quick-couplers/ms-system/ms-system-quick-coupler">QC-HS / QC-MS - MS-System compatible quick-coupler</a></td><td>QC-HS-25</td><td></td><td></td><td>310</td></tr>
<tr><td><a href="https://sieruta.com/en/products/quick-couplers/pin-grabber/pin-grabber-quick-coupler">QC-PG - pin-grabber quick-coupler for factory brackets</a></td><td>QC-PG-100, QC-U-PG-100</td><td></td><td></td><td>740–1,435</td></tr>
</tbody>
</table>
<p>Figures from <a href="https://sieruta.com/en/fit/jcb/jcb-370x">https://sieruta.com/en/fit/jcb/jcb-370x</a>, as of 2026-09-10.</p>

Sizes are matched to the published operating weight of the 370X.

Weight Class: Heavy Excavator (30–65 t)
Operating Weight: 39,888 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 JCB, retrieved 2026-09-10. Source

No open-licence photo of this machine exists. The drawing shows the type (excavator, Heavy 30–65 t), not this machine.

Start here

The attachments buyers in your market ask for first, sized for the 370X.

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.

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 370X.

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Bucket line

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Machine, line and sizes

JCB 370X: DBF - flat-top digging bucket for quick coupler (DBF-400)

370X at a glance

Figure	Value	Source
Max dig depth	8,360 mm	maker's website (jcb.com)
Max reach	11,875 mm	maker's document (greenshieldsjcb.com)
Max dump height	7,275 mm	maker's document (greenshieldsjcb.com)
Arm length	2,630–4,030 mm	maker's document (greenshieldsjcb.com)
Main pump flow	604 l/min	maker's document (greenshieldsjcb.com)
Bucket capacity	2.34 m³	maker's document (greenshieldsjcb.com)
Lift capacity	9,074 kg	maker's document (greenshieldsjcb.com)
Quick coupler	Hydraulic Quickhitch	maker's document (greenshieldsjcb.com)
Transport width	3,200 mm	maker's document (greenshieldsjcb.com)

Only figures the maker publishes for this model. Where a figure is missing, no value is shown.

What the 370X figures mean for its attachments

The main pump delivers up to 604 l/min at 350 bar. That is the pump output of the whole machine, not the flow an attachment gets.
JCB lists this quick coupler for it: Hydraulic Quickhitch. The bracket on every attachment has to match the coupler.
It digs down to 8,360 mm. That is the deepest trench it can open.
Its maximum reach is 11,875 mm.
It dumps at up to 7,275 mm, so a truck or skip side has to sit below that height.
JCB offers arms from 2,630 to 4,030 mm. A longer arm reaches further, a shorter one handles a heavier bucket.
JCB lists a bucket capacity of 2.34 m³.
JCB gives a lifting capacity of 9,074 kg. Check a heavy grab or hammer, plus its load, against the full load chart.
For transport it measures 11,224 x 3,200 x 3,462 mm (length, width, height).
Engine power is 240 kW.

Figures as published by JCB in its own documents.

How the 370X compares with its neighbours

The nearest models by weight, with the difference to the 370X in parentheses where both makers publish the figure.

Model	Operating weight	Max dig depth	Main pump flow
370X	39.888 t	8,360 mm	604 l/min
JCB 420X	42.39 t (+2.502 t)	7,600 mm (-760)	622 l/min (+18)
JCB 520X	52 t (+12.112 t)	7,800 mm (-560)	808 l/min (+204)
Komatsu PC380LC-7	40 t (+0.112 t)	8,050 mm (-310)	536 l/min (-68)

Figures as each maker publishes them. A difference is shown only where both machines have a published value.

370X: build years and variants

Build years: 2024–2026

Variants

370X LC (2024–2026)
370X NLC (2024–2026)

Years and variants as listed in the LECTURA Specs database.

Questions about the 370X

What bucket size fits the 370X?: JCB lists a bucket capacity of 2.34 m³ for it.
Which quick coupler is installed on your 370X?: JCB lists this coupler for it: Hydraulic Quickhitch. Order attachments with the matching bracket.

Buckets Tools Quick couplers

JCB 370X: machine data

Operating weight: 39,888 kg
Engine power: 240 kW
Maximum digging depth: 8,360 mm
Maximum dump height: 7,275 mm
Quick coupler: Hydraulic Quickhitch

As published by JCB, retrieved 2026-09-18. Source

Before you order: check the interface

The weight class of the JCB 370X 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.

Heavy excavators dig rock, load trucks and work in quarries, so wear decides the bucket as much as capacity does. Rock and reinforced buckets carry thicker wear steel, teeth and side cutters, and the bucket is sized to the trucks it loads and to the density of the material.

Quick coupler brackets at this weight

In our model tables, the attachments listed for the JCB 370X 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:

Other JCB models of a similar weight

Other makes of a similar weight

Operating weight within 2 t of the JCB 370X.

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 JCB 370X.

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Do you sell JCB machines? Machine dealer supply

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.