Office Master AF518 Affirm High-Back Management Chair

AF518 is custom-made and non-returnable. All fabric colors shown on your computer screen are approximate depending on resolution of your monitor.

Product ID 18187


  • High-Back Management Chair
  • 3 stages upright lockout; locks the chair in low, medium and high back positions
  • Tilt tension knob
  • Seat Slider
  • 300 lbs weight capacity
  • 12 year limited warranty

NOTE: All chair/arm animations shown are approximate representations; your actual chair/arm may vary significantly in features and appearance. 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 AF518 is a management High Back shown with Del Ray Knit Jack, AR-11 arms, optional polished aluminum 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


  • Management high back
  • Pneumatic lift
  • Easy back height adjustment
  • 3-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

Model AF518
Manufacturer Office Master Chairs
Part Number AF518
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
Carton Weight 58 lbs
UPS Weight 101 lbs
Weight Capacity 300 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.

Officemaster Affirm Management Synchrotilt Chair Comparison Chart

Office Master AF514 Affirm Mid-Back Management Chair
This item: Affirm AF518 High-Back Management Chair
Office Master AF519 Affirm High-Back Management 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