The below item has been discontinued. See above for similar products that we offer instead. We apologize for this inconvenience.


Office Master WS15 Ergonomic Sit-Stand Workstool

  • WS15 is custom-made and non-returnable. All fabric colors shown on your computer screen are approximate depending on resolution of your monitor. 
Product ID 14188


  • A specialty work stool for standing desks
  • Designed to reduce stress on lower back from a prolonged standing position; recommended for users who would like to take short rests during a long standing position
  • Move easily from sitting to standing and leaning back
  • Seat tilts up to 20 degrees
  • Weight capacity: 250 lbs
  • Gliders are recommended for this stool. 
  • If casters are desired, Reverse braking casters are recommended by the manufacturer as they lock when you sit on the chair and minimize the possibility of the stool running away under the user, potentially causing an accident
  • For the upholstered version of WS15, please see WS15VS, which offers the comfort of WS15 and the upholstered seat of the CLVS stool

NOTE: The above video demonstrates general adjustment capabilities which vary depending on the model of the chair. The actual functions & appearance of your chair/arm may differ significantly from the video & illustration shown above. For a list of actual capabilities, please see the features list below or call and ask one of our knowledgeable customer service representatives at 1-888-456-3746. (Some options are available as an upgrade option and must be selected at time of purchase).


Workstools shouldn't require so much attention that adjusting them becomes a job unto itself. Office Master`s low-maintenance, easy-to-clean and affordable workstools are the perfect solution for any workplace or specialty application. In particular, office master WS15 is a great choice because of its unique base and seat tilting feature which make the WS15 a perfect choice for sit/stand applications.

Please note that the WS15 stool is for indoor use only and chemical cleaning is not recommended. For longevity of the stool, avoid round the clock usage that is typical of shift work environments (multiple rotating/consecutive shifts).


Overall Width 23"
Overall Height 28.5" - 38.5"
Back N/A
Seat 15" W x 13" D
Seat Height 22" - 32"
Carton Weight 30 pounds
UPS Weight 33 pounds
Arms N/A
Weight Capacity 250 lbs
Warranty 7 years Limited


  • Pneumatic lift
  • Tilting seat
  • Unibody ring base
  • Glides
  • Optional 8" chrome cylinder available (approx. 19-27")

Product Options/Accessories

Frequently Asked Questions

q What is the weight capacity for this stool?

The weight capacity is 250lbs.

q Are there casters available to make this stool roll?

Casters are not available for this stool as it is not safe or recommended.

Model WS15
Manufacturer Office Master Chairs
Part Number WS15
Overall Width 23"
Overall Height 28.5 - 38.5"
Back N/A
Seat 15" W x 13" D
Seat Height 22 - 32"
Carton Weight 30 lbs
UPS Weight 33 lbs
Arms N/A
Warranty 7 year limited
Weight Capacity 250 lbs

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Limited Warranty

Office Master, Inc. (OM) warrants to the original purchaser that its products are free from defects in materials and workmanship for the applicable warranty period, as indicated below.

Should any item fail, OM will at its sole discretion repair or replace, with a comparable product or part, any item found to be defective as a result of normal commercial use (i.e., a single 8-hour shift, 5 days per week).

This warranty does not apply to items subjected to abuse, misuse, neglect, alteration, or damage caused by shipment, storage, accident, fire, flood, or act of God.

Lifetime Limited Warranty - The OM5 Series (including the OM5 Active sub-series), Truly. Series, and Ginny are covered by a lifetime limited warranty on all structural components as defined below.

12-Year Limited Warranty - Unless otherwise specified, all models not classified as budget or 24/7 or heavy-duty are covered under a 12-year limited warranty on all structural components as defined below.

7-Year Limited Warranty - Unless otherwise specified, all models classified as budget or 24/7 or heavy-duty are covered under a 7-year limited warranty on all structural components as defined below. Budget series include: BC, SG, ST, and WS.

Warranty Terms - Within a given model’s applicable warranty period, all structural components, including gas cylinders, wood, metal and plastic parts (i.e., chair frames, bases and control handles) are guaranteed against
structural failure when under normal commercial use. All OM seating comes with a default 275 lbs. weight capacity limit unless otherwise specified by OM.

For all models, consumable items (i.e., casters, glides, etc.) are covered by a 5-year normal commercial use warranty.

Fabrics and Foam - OM in-stock upholstery & foam cushions are covered by a 5-year normal commercial use warranty. Normal wear and tear on fabrics such as wrinkling, dirt accumulation or gathering is not covered. This includes Truly. Series “Jackets” and “Wraps”. Natural, minor variations may exist in color, surface, grain or texture of upholstery materials. As a result, any such variations are not warranted. COM/COL and graded-in fabrics are not covered.

Claims Procedure - Should any item fail, contact the Dealer from whom it was purchased. A photograph of the damage(s)/issue(s) and of the “born-on” label underneath the seat will be required to help OM determine the cause and extent of any issues. If it is determined that a return is necessary, return that item and its product proof of purchase to the Dealer, whereupon that Dealer will send both to OM, freight prepaid. OM will repair or replace the defective part at its sole discretion and return it to the Dealer, freight prepaid. Please email related photos and details for any warranty claims to [email protected].

Returns - Written authorization from OM is required prior to a Dealer returning any failed or defective parts to OM. Any returned defective part(s) will NOT be accepted without this prior written authorization, or a “Returned Materials Authorization” (RMA) # assigned to it.

Warranty Labor - This warranty exclusively covers the repair or replacement of OM parts as determined by OM and does NOT cover any portion of field labor or service and does NOT cover any portion of field labor or service. For information regarding OM’s non-warranty shop time and related charges, please reference a current copy of OM’s pricebook, in the Terms and Conditions section.