Office Master IU55 24-Seven Intensive Use Ergonomic Stool

IU55 is custom-made and non-returnable. All fabric colors shown on your computer screen are approximate depending on resolution of your monitor.

Product ID 14102


  • Designed for intensive use environments
  • Highly durable and adjustable for 24 hour use
  • Weight capacity: 300 lbs
  • Office Master soft casters CAS0065-S is suitable for wood and tile floor
  • For chairs with taller seat heights, we recommend glides GLD-R or reverse braking casters CAS0050-RB to ensure security and stability. This is our personal recommendation. What type of caster to choose for the chair comes down to the personal decision of the user as to what task and which environment, they are using the chair for. Please don't hesitate to call our customer service at 1-888-456-3746 for consultation on different type of Office Master casters.

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).


Office Master IU55 24-Seven Collection models are perfectly suited for combination seating environments that require 24-hour durability and adjustability. Also known as the Intensive Use (IU) Series, these models are designed for ease of adjustment, comfort and flexibility. With the added benefit of a heavy-duty metal base, and an extra-secure knobless, "turn-lock" footring, the IU55 is always a solid choice for Intensive Use environments.

Note: Arms sold separately, unless otherwise indicated.


Overall Width 27"
Overall Height 45 - 59"
Back 20" W x 20" H
Seat 21" W x 17-20.1" D
Seat Height 24" - 34"
COM 1.5 yards
Carton Weight 53 pounds
UPS Weight 101 pounds
Arms Groups 1 and 4
Weight Capacity 300 lbs
Warranty 7 years Limited


  • Pneumatic lift
  • Easy back height adjustment
  • Independent seat and back angle adjustment
  • Seat depth adjustment
  • Fabric panel back
  • 20" chrome footring
  • Turn-Lock footring
  • Optional 8" cylinder available (21" - 29")

Product Options/Accessories

Frequently Asked Questions

q What is the weight limit of this chair...ie: how much can a person weigh and not break this chair?

The weight capacity for the Office Master IU55 24-Seven Intensive Use Ergonomic Stool is 300lbs as recommended by the manufacturer.

q Is the foot ring adjustable?

Yes, the foot ring of the IU55 chair has a patented turn lock that can be turned to move up and down. It can then be locked in that position.

q How many inches does the seat of IU55 tilt forward/downward?

The IU55 has a 10" cylinder as standard. It also offers the option of an 8" cylinder for an additional price. Unfortunately, none of the high chairs (including the IU55) with a cylinder higher than 6" offer forward tilting. This is due to liability in tilt ratios. As such, we do not know of any chairs like this that would offer this sort of capability (neither that we carry or from competitors). There is one and only one exception which is a "non-traditional" seat Neutral Posture AbChair TAsk Lab Healthcare Cleanroom Stool which does offer forward tilting and can be ordered with an 8" cylinder bringing the seat height range to 23-31".

Model IU55
Manufacturer Office Master Chairs
Part Number IU55
Overall Width 27"
Overall Height 45 - 59"
Back 20"w x 20"h
Seat 21"w x 17-20.1"d
Seat Height 24 - 34"
COM 1.5 yards
Carton Weight 53 lbs
UPS Weight 101 lbs
Arms Groups 1 & 4
Warranty 7 year limited
Weight Capacity 300 lbs

Customer reviews

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  • 5 stars 1
(5 out of 1)
Task Chair

by James A, Georgia, Dec 11, 2016

Great product for the money. Using at a work table. The options for building the chair allowed for customizing it to fit the work table. Shipping was on time.

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.