Everflex ZM X918519

36.0" Height

18.25" Width

23" Depth

18" Seat Width

19" Seat Height

18.2 lbs. Weight

8 high Stacks

call C.O.M. Req.

Product Overview

The EVERFLEX™ banquet chair X918519 blends the comfort of a flexible back with the ergonomic characteristics of Bertolini’s proprietary Flex-Fit™ polymer seat providing your guests with five star seating comfort that will last all day long. You’ll love the unbeatable durability as much as your guests will love the five star comfort. Just take the industry’s strongest banquet chair frame, our ZERO Maintenance Flex-Fit™ Seat with BosScrew™ technology, and the million cycle EVERFLEX™ composite spring system for a chair that lasts longer and needs replacing less often. The EVERFLEX™ delivers five star comfort and a strong return-on-investment perfect for today’s banquet facilities.

Technical Specs

Back Shape:


Frame Construction:

Back Loop:

3/4” 16 gauge square steel tubing, flux-cored arc welded and mandrel-formed loop assembly.

Seat Sub-frame:

3/4” 16 gauge square steel tubing, flux-cored arc welded and mandrel-formed loop assembly
with rear support bar.

Flex Device:

Flex device constructed using composite pultrusion springs tested to over 1 million flex cycles. Everflex system included in structural warranty.


1” 17 gauge radius edged square tubing for 6% more strength than standard 1” 16 gauge square tubing.

Stack Bars:

1/2” 18 gauge electric welded steel tube with two stack buttons per bar. Stacks 10 high.

Torsion Bars:

5/16” diameter solid steel torsion rods for superior vibration absorption.

Steel Tubing:

    Meets ASTM A-1008-03-CS-TYPE B/SAE-1010-AK
  • 16 gauge wall thickness of .060" +/- 10%.
  • 17 gauge wall thickness of .054" +/- 10%
  • 18 gauge wall thickness of .048" +/- 10%


28+ individual MIG welds

Bertolini Inc. frames are made from the strongest American steal in the seating industry. Frames are randomly tested for quality and durability. Bertolini exceeds all ANSI/BIFMA requirements. Bertolini regularly test to three or four times BIFMA standards to ensure the best in quality and performance.

Self-Tightening BosScrew™

Back Construction:

Back Attachment:

Back is attached with #10x5/8 screws through 6 cold-rolled steel tabs.

Inner Back:

Inner wood back is 1/2” plywood board with 1.0” thick 1.5 LB/CU.FT. flame retardant polyurethane foam. Meets CAL-117-2013 requirements.

Outer Back:

Outer back is contract grade chip board with 3/8” flame retardant polyurethane foam. Outer back is attached using 17 pull-stop nylon fasteners offering a two-piece back supported within the steel back loop without exposed fasteners. Each fastener is tested to 40 lbs. holding strength.

Flex Back:

Exclusive Everflex flex-back system featuring two composite flex springs hidden under the chairs seat. Includes flex bumpers ensuring users a pinch-free experience. Surpasses all BIFMA requirements and standards. Cycle tested to over 1 million full flex cycles. Features dining pitch in upright position.

Million Cycle Everflex

Seat Construction:

Flex-fit blow molded seat made from post-industrial recycled plastic for the most environmentally friendly banquet chair on the market. Seat offers double the break strength of a traditional wood or wood/webbed seat base while still offering a flexible base for comfort and foam life. Seat offers 1.5” of 2 LB/CU. FT. Density and ILD of 55 Lbs commercial grade American foam. Meets CAL-117-2013 requirements.

Innovative Flex-Fit™ Seat



Four Clear, Non-Corrosive, Ribbed and Double Booted Rocker Glides offered exclusively by Bertolini Inc. Self-leveling rocker glides eliminate the common failures of swivel-glides and are backed by a lifetime replacement guarantee.

Stack Buttons:

Friction-fit, non-rigid polymer stack buttons providing non-marring stacking assistance and support.

Variations to this Model include:

  • X918119: non-flexback
  • X916519: 16” wide seat with stack bars


20 Year Structural Frame Warranty, 10 Year Component Warranty. Glides for Life of your chair.

Often specified with these accessories:

  • Clear or Black Glides:

    Clear plastic glides complement any chair; for floors that tend to show scuff marks.

  • Radius Interlocks

    Radius interlocks allow enough space to make a semi-circle.

  • Retractable Interlocks

    These interlocks can be retracted to hide away when not in use.


Longest Banquet Chair Warranty in the Industry

20 years structural and 10 years components.

Maximum ROI for Your Property

We've brought together the Industry's Strongest Banquet Chair Frame, zero maintenance seat and longest warranty to provide you with maximum return on investment.

Sustainability Profile

A Banquet Chair that is Built and Sourced Locally in the USA:

Quality built in the USA for a chair that lasts longer and needs replacing less often; locally sourced with components such as recyclable USA steel, bio-based foam cushioning, and 30+% post industrial recycled seat polymers.

Read more about our sustainability efforts...


Available Downloads for this Product

Download Our Banquet Chair Overview(PDF)

Download Specifications Sheet(PDF)

For a complete list of all available downloads visit our Download Page.