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May 24, 2018


Ball stud 789 and 793

Geographe have created a ball stud, designed to give a superior life span when used in a CAT 789 or 793 Haul Truck. This ball stud is equivalent to 8X-9620.

8 commonly asked questions regarding the Geographe equivalent of  Ball Stud 8X-9620


1 – What are the strength and fatigue properties of a Geographe 789/793 Ball Stud compared to that of an equivalent Caterpillar Ball Stud? 

  • OEM measured samples: 15-17 J (Izod)
  • Geographe specification: 40 J (Izod)

Geographe Ball Studs have over twice the impact resistance of an Caterpillar 8X-9620 Ball Stud tested, so are tough and wear extremely well.


2 – Is there a material difference when manufacturing the Geographe ball stud, in comparison to the OEM?

Yes, our material choice offers optimum toughness and impact resistance when coupled with our heat treatment specification in order to help create a superior stud.


3 – How does the Geographe ball stud design differ from the original OEM design in order to reduce the risk of cracking?

Geographe use high tensile alloy steel that is heat treated to a very tough, impact resistant condition. The neck radius has been control shot peened to provide a layer of compressive residual stress.


4 – What life span should we expect from a Geographe Ball Stud when used in CAT 789 and 793 trucks?

Geographe conducted a trial with a valued international client conducting periodic inspections up to 18,000 hours.  Upon final inspection the trial, had been considered a success and the components were utilised in accordance with scheduled maintenance practices.  The stud lifespan may vary depending on the conditions in which mining is taking place.


5 – What is the recommended Geographe inspection & maintenance strategy?

Geographe recommends inspecting the ball studs as per the Caterpillar OEM specifications.


6 – Do Geographe offer oversized versions of these studs?

Yes – we offer two oversized  ball stud versions.  The nominal diameter (dimension “z” in the figure below) of the standard, first and second oversized versions are:

  • Standard              Dia. 82.55mm
  • 1st Oversize          Dia. 83.34mm
  • 2nd Oversize        Dia. 84.14mmBall Stud

Oversized Ball Studs are usually made to order.  Please contact us regarding manufacturing lead times.


7 – Can I purchase your 8X-9620 equivalent as part of a ball stud kit

Yes you can, the 789 and 793 Ball Stud Kits contain the following items :

1 x 11514372 (SNAP RING – 5T6667)
1 x 11491437 (BALL STUD CAP – 5T6503)
1 x 11476972 (RACE BEARING – 6V7959)
1 x 11513943 (BALL STUD COVER – 5T6809)
1 x 11477808 (BALL STUD – 8X9620EP)
1 x 11472913 (HI TENSILE NUT – 3J6899)

The complete Geographe Ball Stud Kit to suit Caterpillar 789 & 793 trucks can be seen here.

8 – Do Geographe offer a tool which can assist us when it’s time to remove these studs?

Yes – we have tooling to suit standard Caterpillar 789 and 793 Haul Trucks, and also additional tooling to suit those  Caterpillar 793  Trucks fitted with Extended Life Brake Packs (ELBP).  Please see our blog post regarding our Patented Ball Stud Removal Tool.


Geographe are proud to have sold thousands of our ball studs and ball stud kits to suit Caterpillar Haul Trucks to a wide variety of customers worldwide for over 20 years.

In summary, Geographe ball stud design improvements include a material change, heat treatment plus lubrication and machining tolerance enhancements.

The taper to socket radii is machined to N6 and shot peened to apply a state of compression at the surface.

We have also added figure 8 grease grooving to the socket area increasing the lubrication spread by approximately 200%.

As of 2020, we have yet to have a recorded failure…. Why not see why a Geographe Ball Stud is a better ball stud.

Download our Ball Stud Kit flyer now for more information

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