The most common stud fittings for agricultural machinery

Mikayla Brock
on
10 November 2021

With so many different stud fitting on tractors and trailers, we decided to document the most common hubs on one page.  We’ve included measurements so you can check yours.

If you’re buying used wheel sets, you can use this page as a reference to check whether the wheels will fit on your axles.  Please bear in mind that the centre bore diameter of the wheel is normally 0.5-1mm larger than the centre bore on the tractor (this is to ensure they fit on).

The 10/335 is one of the most common stud fitting on tractors and agricultural machinery.  Some common machines include:  JD 6145R/6155R front axle, JD 6175R-6250R front and rear axle, Fendt 718-724 & 800 series front and rear axles, NH T7 & Case Puma long wheel base rear axles, some MF 7S front axles and sliding bar rear axles, many agricultural trailers and sprayers, etc

No. of studs:  10
PCD (Pitch Circle Diameter): 335mm
Centre Bore Diameter:  281mm
Stud Hole Diameter:  Varies.  See note A

Note A:  The 10 stud axle can have many different stud fittings, most common is 24mm (i.e. rear of a JD 6175R-6250R) or 22mm (Front of a JD 6R), 21mm (JCB 4000 series Fastrac Stage 4), or even 27mm with a countersink (Common on sprayers and some trailers)

The 8/275 is frequently seen on tractors.  Some common machines include:  JD 6145R/6155R rear axle, Fendt 714-716 rear axle, NH T7 & Case Puma short wheel base rear axles, some agricultural trailers, etc

No. of studs:  8
PCD (Pitch Circle Diameter): 275mm
Centre Bore Diameter:  221mm
Stud Hole Diameter:  Varies.  See note B

Note B:  The 8 stud axle can have many different stud hole diameters, common ones include 19mm (rear of a NH T7 or Case Puma SWB), 21mm (i.e. rear of a JD 6145R/6155R) or 24mm (Rear of Some MF’s, Valtra T series & some Claas tractors), or even 27mm with a countersink (Fendt 714-716).

The 8/203 is less common now however can still be found on the rear of older Massey tractors, the back of some smaller JD’s such as the 6M, front and rear on some smaller Kubota tractors, etc

Its very important to note that there are two different 8/203 hubs.  The first has a 153mm centre bore diameter the second a 151mm – it doesn’t sound like 2mm would make much difference, but it does.  If you try and fit a 151mm on the 153mm it simply won’t fit.  However, if you fit a 153mm hub when it should be a 151mm, the centre bore won’t hold the wheel on tight putting more strain on the studs and potentially leading to expensive and dangerous damage.

8/203 with a 153mm centre bore diameter is normally found on John Deeres and Kubota tractors.
All other machines with 8/203 hubs normally have a 151mm centre bore – however there are exceptions to the rule

The 8/203 hub is notorious for cracking wheel rims, particularly with larger diameter wheels.  Its a very small hub which puts a lot of strain on the metal around the studs.  Most tractor manufacturers are moving away from using this hub on their larger machines.  For larger tractors such as the rear of a MF or Claas, 15mm thick high grade steel is essential for the 8/203 axle.

No. of studs:  8
PCD (Pitch Circle Diameter): 203mm
Centre Bore Diameter:  153mm (6″) – see note above
Stud Hole Diameter:  Varies.  See note C

Note C:  The 8/203 axle can have many different stud hole diameters, common ones include 21mm (rear of some JD 6M, etc), 20mm or 21mm for Kubota rear axles, and 17mm/18mm for Kubota front axles

No. of studs:  8
PCD (Pitch Circle Diameter): 203mm
Centre Bore Diameter:  151mm – see note above
Stud Hole Diameter:  Varies.  See note C

Note C:  The 8/203 axle can have many different stud hole diameters,  most common is 20mm, but it does vary.

There was also a 8/203 hub with a 140mm centre bore diameter – this had 20mm stud holes for the New Hollands and  32mm countersunk stud holes for the older Ford tractors .

The 12/425 is most commonly found on the new stage 5 JCB 4000 series axles, however its been used for a number of years on the front of tractors such as larger JD 7R’s, MF and T8’s, etc.

John Deere make two similar 12 stud axles which can be confused: the 12/425 and the 12/500

No. of studs:  12
PCD (Pitch Circle Diameter): 425mm
Centre Bore Diameter:  363mm
Stud Hole Diameter:  Varies.  See note D

Note D:  The 12/425 axle normally has 22mm or 24mm stud holes

The 8/405 hub is used on the front of the New Holland T7 & some T6’s as well as the Case equivalent Case Puma’s & Case Maxxum.

Case/New Holland refer to this axle as the Class 4. (Class 4 is 8 stud 405, Class 3 is 8 stud 330)

No. of studs:  8
PCD (Pitch Circle Diameter): 405mm
Centre Bore Diameter:  362mm
Stud Hole Diameter:  17mm

New Holland & Case call this the Class 4 axle

The 8/330 hub is used on the front of the New Holland T6 and Case Maxxum.

Case/New Holland refer to this axle as the Class 3. (Class 4 is 8 stud 405, Class 3 is 8 stud 330)

No. of studs:  8
PCD (Pitch Circle Diameter): 330mm
Centre Bore Diameter:  291mm
Stud Hole Diameter:  17mm

New Holland & Case call this the Class 3 axle

Also see:  How to measure an axle width

Mikayla Brock