4-40 x .400 Ball Stud Set (6) by JConcepts

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This is an optional JConcepts 4-40 x .400 Ball Stud Set. A great quality ball-stud is an underrated functioning component of a high performance R/C vehicle, and is the foundation for a solid tie-rod connection. Durability, smooth finish, thread engagement and adjustability play a significant role in the performance of your car. JConcepts is offering a precision machined, stainless steel ball-stud, that features an internal hex for installation and a smooth surface finish for ultra free movement. Packaged in quantities of six, the ball-studs are available to meet the demands for any Team Associated off-road vehicles.


  • Stainless steel material
  • Smooth surface finish
  • Deep thread engagement
  • Internal hex fits 5/64” and 2mm hex wrench
  • 4-40 x .400
  • Fits entire line of Team Associated off-road vehicles

This product was added to our catalog on September 5, 2013.

Friday, Dec 27 2013 (about 4 years ago)
JConcepts 4-40 x .400 Ball Stud Set (6)
I do not know what design they had in mind but these are too tight for new turnbuckle ends from Team Associated. I tried all three sizes and all are tight with new turnbuckle ends. They are a few thousandths larger in diameter than the stock ballstuds. I have not contacted Jconcepts about this yet. These appear very well made but possibly intended for aftermarket turnbuckle ends. I first noticed this problem with the carbon fiber ackerman kit Jconcepts sells for the b4/sc10 series cars and trucks.