Flex Joint Information:

Two New Sizes Now Available!

The Summit Machine Flex Joint is going on five years of perfection. You will not find a higher quality, better functioning "Cartridge Style" joint than the Summit Machine Flex Joint. Along with all of our other products, we design and build our flex joints to MIL standards!

A rebuildable spherical joint for the builder on a budget. Housing is unplated steel for easy welding. Races are molded from Nylatron GS, which is a grade of nylon (a proprietary nylon mixture) created specifically for bearing applications which has undergone years of study and perfection. The Nylatron GS races along with our ultra smooth machined and Nickel plated pivot ball achieve ultra long service years and lube-less "if you choose" performance. Case studies have proven that our flex joints have surpassed over 2 years (and still counting!) with no service or grease and are still as tight as the day they were assembled!

Degree of Travel

  • SM-FJS with 10mm bolt hole 35 degrees
  • SM-FJS with 12mm bolt hole 25 degrees (JK ball)
  • SM-FJM 26 degrees
  • SM-FJL 35 degrees
  • SM-FJXL 34 degrees

Introducing two new sizes:

  • Medium Flex Joint- 2-3/8" OD 2-5/16" mounting width with a 9/16" - 14mm bore ball. These are perfect for Jeep JK rear upper control arms or Toyota FJ cruiser rear control arms.
  • Extra Large Flex Joint- 3" OD 3" mounting width with a 5/8" bore ball. These are designed as a budget rebuild-able joint for larger vehicles.


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Flex Joint Specifications
part # A B C D
SM-FJXL 3.000 3.000 .625 2.125
SM-FJL 2.625 2.625 .565 1.875
SM-FJM 2.375 2.3125 .5625 1.650
SM-FJS 2.000 2.000 .375 1.500
rebuild kit part #

Flex Joint w/ Shank Information:

Flex Joint with a shank casing to ensure strong and easy installation and use. Available in Right and Left Hand Thread.

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Flex Joint Specifications
part # A B C D
SM-FJXL (1-14) LR & RH 3.000 3.000 .625 2.125
SM-FJL (7/8-14) LR & RH 2.625 2.625 .565 1.875
SM-FJM (3/4-16) LR & RH 2.375 2.3125 .5625 1.650
SM-FJS (3/4-16) LR & RH 2.000 2.000 .375 1.500

Flex Joint Tool Information:

Spanner socket used to disassemble and reassemble Summit Machine Flex Joints. Fits most 1/2" drive ratches.

Flex Joint Tool Specifications
part # description
SM-FJXL-TOOL Extra Large Flex Joint Tool
SM-FJL-TOOL Large Flex Joint Tool
SM-FJM-TOOL Medium Flex Joint Tool
SM-FJS-TOOL Small Flex Joint Tool
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