Does this make the chair taller?

Yes, it makes the chair Taller. The original Herman Miller cylinder sit about 2 inches past the wheel base. The heavy duty cylinder sold here sits taller as it doesn’t go past the base. Hope this helps!

does this come with the bearing already installed

Yes, the bearing installed already, Inside outer tube, thank you!

How can you tell how old the chair is (if it is between 1996 and 2012)?

Check the serial number and or Part numbers on the chair. Call the manufacturer my chair was a Herman Miller chair and they were able to tell me when it was sold to me and that I had a 10-year warranty... S0 the numbers on the chair sometimes indicate MFG year. Good Luck

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MingYi.officeGas Cylinder Heavy Duty for Herman Miller Classic Aeron Chair as Replacement

MingYi.officeGas Cylinder Heavy Duty for Herman Miller Classic Aeron Chair as Replacement

Product ID: 143354091

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Details

Brand
MingYi.office
Color
Black
Product Dimensions
25"D x 25"W x
Size
2D x 2W x
Back Style
Solid Back

💪350 lbs load capacity, heavy-duty strength

📏4.5" stroke for smooth height adjustment

🛠️ANSI/BIFMA5.1-2011 certified durability

Description

🚀 Elevate your workspace with precision and power!

BUILT TO ENDURE - Supports up to 350 pounds, engineered for long-lasting performance.
UNIVERSAL AERON FIT - Compatible with Herman Miller Aeron chairs Size A, B, and C (1996-2012 models).
WORRY FREE WARRANTY - Backed by a 5-year replacement guarantee for ultimate peace of mind.
EFFORTLESS HEIGHT CONTROL - Precision 4.5-inch pneumatic stroke for seamless seat adjustments.
CERTIFIED QUALITY ASSURANCE - Exceeds rigorous ANSI/BIFMA5.1-2011 standards for office furniture safety.

The MingYi.officeGas Cylinder is a premium Class 4 pneumatic gas lift designed specifically for Herman Miller Aeron chairs (1996-2012). Featuring a 4.5-inch stroke and a robust 350-pound load capacity, it surpasses ANSI/BIFMA5.1-2011 standards, ensuring reliable, smooth height adjustments. Compatible with all Aeron sizes (A, B, C), it comes with a 5-year replacement warranty, making it the ultimate upgrade for your classic office chair.

Specifications

Seat Height	16 Inches
Item Weight	1.15 Kilograms
Unit Count	1 Count
Item Dimensions D x W x H	2"D x 2"W x 11.8"H
Size	2D x 2W x 11.8H in
Item Shape	Cylindrical
Furniture Finish	革
Pattern	Solid
Finish Types	Lacquered
Color	Black
Style	Classic
Product Care Instructions	Wipe Clean
Fill Material	Foam
Seat Material	Foam
Frame Material	Metal
Material Type	Metal
Maximum Weight Recommendation	350 Pounds
Is Customizable?	No
Is Electric	No
Furniture Base Movement	Glide
Tilting	No
Special Features	转

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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Good experience, but the tracking updates could be better.

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