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Flex Series (Clamshell Sockets)

RST introduces the most versatile machined socket program in the test industry. Flex combines the economy of an off-the-shelf molded socket with the design flexibility of a custom socket. The outcome is a socket series on six flexible platforms that can test a multitude of package types and pitches. With off the shelf design capabilities, FLEX is tailored to fit your particular package, lead, and pitch configuration.

Flex handles pitch dimensions as little as 0.35 mm spacing with no upper limit. From micro-sized chip scale to high count BGA, from JEDEC standard to ultra custom, FLEX will accommodate nearly any package configuration.

A variety of materials and contact types can be substituted within each socket platform to accommodate your specific test requirement. With the ability to substitute materials, FLEX sockets can be used in many different test and burn-in environments.


  • Socket Body: Black PEI (Ultem 1000)
  • Nest: Black PEI (Ultem 1000), optional Torlon 4203 for specific pitch spacing
  • Contacts: Spring Probe, surface mount typical, may vary with application
  • Contact Plating: Min. 30 microinches Gold typical, may vary with requirements


  • Temperature: -55°C to +150°C - Higher temperature options
  • Moisture: 85/85, consult factory for material options for HAST environments
  • Insertion Force: Varies with application


  • Current : 1amp continuous typical, consult factory for greater requirement Dielectric: > 1x1012
  • Insulation Resistance: Varies with application
  • Contact Resistance: Varies with application

  Flex Series:
  Flex 5
* 0.50" (12.7mm) sq
  Flex 7
* 0.75" (19.0mm) sq
  Flex 10
* 1.00" (25.4mm) sq
  Flex 12
* 1.25" (31.8mm) sq
  Flex 15
* 1.50" (38.0mm) sq
  Flex 20
* 2.00" (51.0mm) sq