Office Master AF508 Affirm High-Back Simple Chair

AF508 is custom-made and non-returnable. All fabric colors shown on your computer screen are approximate depending on resolution of your monitor.

Product ID 18185


  • High-Back Simple Chair
  • 1 stage upright lockout; locks in one upright position only
  • Tilt tension knob
  • Seat Slider
  • 300 lbs weight capacity
  • 12 year limited warranty


Office Master AF508 is a simple High Back shown in Night Fall Black Mesh, JR-49 arms, standard modern black package, and dual color soft casters (additional charges may apply).

Affirm’s modern, sleek, frameless mesh design evinces the confidence to fit in to any workspace - whether a tech start-up, a healthcare environment, an educational facility, an architectural firm or a more traditional office place it’s the perfect combination of class and comfort.


Overall Width 27"
Overall Height 41.5" - 49"
Back 21" W x 24" H
Seat 20.5" W x 17.5-20.6" D
Seat Height 17" - 22"
COM 1 yard
Carton Weight 58 pounds
UPS Weight 101 pounds
Arms Groups AR, 1 and 4
Weight Capacity 300 lbs
Warranty 12 years Limited


  • Simple high back
  • Pneumatic lift
  • Easy back height adjustment
  • 1-stage locking tilt
  • Synchronous seat/back tilt
  • "Frameless" mesh back design
  • Seat depth adjustment
  • Dual-tone oversized soft casters
  • Nightfall black mesh is default
  • Tension knob

Product Options/Accessories

Frequently Asked Questions

q What is the weight limit on this chair please?

The weight capacity of Office Master AF508 Affirm Simple Synchro High-Back Chair is 250lbs.

Model AF508
Manufacturer Office Master Chairs
Part Number AF508
Overall Width 27"
Overall Height 41.5 - 49"
Back 21"w x 24"h
Seat 20.5"w x 17.5 - 20.6"d
Seat Height 17 - 22"
COM 1 yard
Arms Groups AR, 1, and 4
Warranty 12 year limited
UPS Weight 101 lbs
Carton Weight 58 lbs
Weight Capacity 300 lbs

Customer reviews

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  • 5 stars 1
(5 out of 1)
Awesome chair!

by Scott D, Lancaster, California, May 08, 2016

I purchased this chair for my son who is at college. He loves it! He spends 60+ hours in it a week doing homework, online, and gaming. He thinks the chair was well worth it and would definitely recommend it.

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.

Officemaster Affirm Simple Synchrotilt Comparison Chart

Office Master AF504 Affirm Mid-Back Simple Chair
This item: Affirm AF508 High-Back Simple Chair
Office Master AF509 Affirm High Back Simple Chair with Headrest
Overall Height 38.25 - 45.75" 41.5 - 49" 47 - 58"
Overall Width 27" 27" 27"
Back 19.75" W x 20.5" H 21"w x 24"h 21"w x 24"h plus 6" headrest
Seat 19" W x 17.5-20.6" D 20.5"w x 17.5 - 20.6"d 20.5"w x 17.5 - 20.6"d
Seat Height 17 - 22" 17 - 22" 17 - 22"
  Details Details