OM5XT Series Work Chair Xtra Tall Back with Black Frame

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Ships in 7-10 Business Days

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The OM5 Series® XT Version offers a taller back and longer, fixed depth seat when compared to the regular OM5. The OM5 series features patent-pending “body-activated motion” that automatically adjusts to the user. A collaboration between talented designer Francisco Romero of Phidesign and the engineering team at Office Master, it is intuitive, user adaptive, and uniquely suited for today’s flexible working environments. Advanced ergonomics, finely tailored styling, and attention to comfort – all found in the truly innovative, yet attractively priced OM5 Series. This model available in Black frame, arm-less, with a black PolyFlex back, and multi-surface soft casters12 Year Limited Warranty. Ships Free in 7-10 Business Days.

For the OM5 Series® XT Palladium Grey Frame Version see here.



  • Extra Tall 5 Star Base
  • Tall Back and Deep Seat
  • Specifically designed for tall users
  • Poly Flex Back provides firm or soft support as needed
  • Body-Activated Motion
  • Virtual Pause/Lock
  • Variable Back Resistance - rollers in the seat and back respond with more or less resistance to recline
  • Front Edge Waterfall Flex - adjusts to each user’s thigh length and range of motion needs
  • Standard Armless - see options below for choices
  • PolyFlex Back comes in 3 colors - see below
  • See below for arm and base options
  • 300 lbs. user weight capacity



  • Overall Width 28"
  • Overall Height 40.5-45.5"
  • Back 18"W x 24.5"H
  • Seat 19.75"W x 20"D 
  • Seat Height 19-24"


Frame Color: Black


PolyFlex Back Color Options: Modern Black, Palladium Grey, Arctic White



Arm Options: 

  • Height adjustable T-arms OM5
  • Multi-adjustable With ht./width fore/aft, inward pivot Arms; RP45 
  • Fully-adjustable With ht./width fore/aft, pivot Arms Code: RP50

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Base Accent Option: Standard Black or Polished Aluminum

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Standard Multi-surface Soft Casters






Office Master offers the following warranties to the original user. 12 Year Limited warranty unless otherwise specified, all models not classified as 'budget' or 24/7 or heavy duty. 7 Year Limited Warranty unless otherwise specified, all models classified as budget or 24/ 7 or heavy duty. Fabrics and foams are covered by a period of 5 years. All models are equipped to handle sitters up to 250 pounds unless noted otherwise. Warranty does not cover labor. To start a claim contact us at 888-355-4999 for products bought directly from us or Office Master at 877-776-5678