Office Master PT78 (OM Seating) Paramount Large Task Chair
- PT78 is custom-made and non-returnable. All fabric colors shown on your computer screen are approximate depending on resolution of your monitor.
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NOTE: The interactive illustration above shows general adjustment capabilities, which vary by chair model. Actual functions and appearance may differ. For a list of capabilities, see the features list below or call our customer service at 1-888-456-3746. (Some options are available as upgrades and must be selected at purchase)
Description
Office Master PT78 comes from the PT Value Line and is a reliable desk chair that was built to meet the demands of daily cross-performance use. With a full complement of features that affords users the ability to adjust the chair to their comfort, each of the chairs from the PT value line offers a compelling combination of comfort, style, and affordability. PT78 is designed to accommodate users up to 300 pounds. Office Master is now known as OM Seating.
Note: Arms are sold separately unless otherwise indicated.
Specifications
| Overall Width | 27" |
| Overall Height | 40 - 48" |
| Back | 19.5" W x 22" H |
| Seat | 21" W x 18-21.1" D |
| Petite Seat Height - 4" cylinder Standard Seat Height - 5" cylinder Tall Seat Height - 6" cylinder | 15.5" - 19.5" (approx.) 17" - 22" (approx.) 19.5" - 26" (approx.) |
| COM | 1.5 yards |
| Carton Weight | 57 pounds |
| UPS Weight | 101 pounds |
| Arms | Groups 1 and 4 |
| Weight Capacity | 300 lbs |
| Warranty | 12 years Limited |
Features
Pneumatic Height: Pneumatic means powered by air or gas. The cylinder, controlling the seat height, uses pressurized air to adjust the seat to the desired level. The seat height adjustment lever is on the right side of the seat.
Tilting Backrest: Raise the last paddle on the right side of the seat to tilt the back freely. Push it down to lock and adjust the backrest angle for proper support.
Back Height Adjustment: Place your hands on both sides of the backrest and lift slowly. Raise it to the top, then push down to the bottom before raising and stopping at the desired position. Clicking sound indicates available height positions. Adjust the backrest to comfortably fit the small of your back.
Rocking Tilt: Use the second lever on the right side of the seat to control both rocking tilt and seat tilt. Pull up for free tilting, push down to set the angle.
Tilting Seat: Use the second lever on the right side of the seat to control both rocking tilt and seat tilt. Pull up for free tilting, push down to set the angle.
Seat Depth Adjustment: Find the seat slider paddle on the left of the seat. Raise the paddle while planting the feet firmly on the floor. Scoot forward or backward with the paddle in the raised position and release the paddle to lock the seat depth. Ensure you can sit with your back rested comfortably against the backrest and your feet flat on the floor.
Forward Tilting: First tilt the seat backward with the tilting seat lever. Now find the first lever on the right hand side and turn it clockwise to prevent forward tilting and anti-clockwise to unlock it.
Adjustable Lumbar: On the right side of the backrest towards the bottom, you will find a small knob. Turn the knob clockwise for increased lumbar support and anti-clockwise to reduce it.
Tension Knob: The tension knob. located underneath the seat, adjusts how much resistance you feel when leaning back. Turn it clockwise to increase tension (harder to lean back) and counterclockwise to decrease tension (easier to lean back).
Product Options/Accessories
Frequently Asked Questions
No, our chairs do not arrive assembled. They typically arrive in three pieces (base, seat and back) and can be easily assembled without any additional tools or professional help.
| Model | PT78 |
| Manufacturer | OM Seating Chairs |
| Part Number | PT78 |
| Weight | lb(s) |
| Overall Width | 27" |
| Overall Height | 40-48" |
| Back | 19.5" W x 22" H |
| Seat | 21" W x 18"-21.1" D |
| Seat Height | 15.5" - 19.5", 17" - 22", 19.5" - 26" |
| COM | 1.5 yards |
| Carton Weight | 57 lbs |
| UPS Weight | 101 lbs |
| Arms | Groups 1 & 4 |
| Warranty | 12 year limited |
| Weight Capacity | 300 lbs |
Customer reviews
- 1 stars 0
- 2 stars 0
- 3 stars 0
- 4 stars 2
- 5 stars 3
by Sean McArthur, Metairie, Louisiana, May 09, 2023
These chairs are legit office chairs and much higher quality than so-called ergonomic chairs you'll find for $300. If you need it all in a chair, invest in a chair like this and don't waste money on a cheaper chair you may not be happy with. I'm a tall guy at close to 6'4" and this promotes the best posture for me when i use the tilting feature and lock it in place. I would go with the next size up from this chair if you are a bigger guy. I'm only 195 and the seat is barely big enough. It's important to make sure the seat slider will get under your knees. I also got a good quality fabric that should last. I also didn't bother with arm rests as they just get in the way for me. Overall, this chair is much like more expensive office chairs that I used in office environments and were provided for me. I also opted for the tallest seat cylinder even though I don't think i needed it. Better to have it and not need it rather than need it and not have it.
by Justin McBride, Sandy, UT, Nov 28, 2019
I’ve had this chair for a year and I'm very happy with it. It’s comfortable, sturdy, and has all the adjustable features most people need. I recommend getting the memory foam seat. It’s worth the extra money.
by robert s, san francisco, California, Jan 09, 2018
Great Chair!
by Gregory A, Camarillo, California, Aug 30, 2017
So let me start by saying I very much enjoy the chair. Putting it together was easy and it came in a reasonable amount of time. The build quality is very high and the chair is mostly comfortable to sit in, I do feel I have better posture now than I did before getting this chair. My only complaint with the chair is the optional feature of the recline mechanism. It seem the the tilt function of the chair is lost with this mechanism installed which I was not aware of when purchasing the chair. Had I know that I would have just bought the standard mechanism instead of the added cost since I would rather have tilt over recline.
by Cesar R, California, Jan 19, 2017
I recommend this chair to everyone who care his or her back. I love it :-)
- Office Master Arm Types
- Brochure Paramount Value Series
- Assembly Paramount Value Series
- General Paramount Value Series
- How to adjust Office Master PT78 chair
- Backshell Replacement/Repair Instructions
- How to replace EZ back height adjustment mechanism
- Installation Manual for Group 1 and Group 4 OM Arms
- Back Hinge Angle Adjustment
- GREENGUARD Certificate
- BIFMA LEVEL Certificate
- Disassembly Recycling Instructions
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.
