What is the diameter at the bottom end? Will it fit a hole about 1.86" wide at the bottom? (I get that it is 2" at its widest dia)

It measures 1.560" in diameter with a digital caliper. If your chair's leg piece has a hole that is 1.86", this would be a loose fit. The reduced diameter section extends about the same dimension (1.560") in length. Note that many cylinders have a bottom end reduction that is much shorter.

Will this one work on chair model svx-11?

couldn't tell you but most of the lower price chairs 100-200$ use the same cylinder !

What is the contact info for the warranty?

Another good question. Let me know too

Will this fit a Steelcase Leap 462 V1 work chair from 2001?

No idea! But will say that it did not last very long - all my chairs sink to the lowest position possible. :(

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ZITRIOM Office Chair Gas Lift Cylinder Replacement, Heavy Duty Hydraulic Pneumatic Shock Piston Universal Size Fits Most Executive Chairs

ZITRIOM Office Chair Gas Lift Cylinder Replacement, Heavy Duty Hydraulic Pneumatic Shock Piston Universal Size Fits Most Executive Chairs

Product ID: 32686856

📏Universal 15-inch length fits most chairs

🔄360° smooth rotation & noiseless lift

⚙️Heavy-duty build supports up to 150kg

Description

🚀 Elevate your workspace comfort—because your chair should work as hard as you do!

BUILT TO ENDURE - Heavy-duty hydraulic piston engineered for maximum durability and weight support up to 150kg—no more chair failures during crunch time.
RISK FREE UPGRADE - Backed by a 5-year guarantee and 100% money-back promise—join thousands who’ve revitalized their office setup with confidence.
EFFORTLESS 360 MOBILITY - Seamless up/down adjustment with smooth, noiseless 360-degree rotation—because your workflow deserves fluid movement.
QUICK EASY INSTALLATION - Replace your worn-out gas lift in under 10 minutes with minimal tools—get back to work faster and stress-free.
UNIVERSAL FIT ZERO HASSLE - Precision-crafted to fit most executive, computer, and desk chairs across the US and Canada—upgrade your chair, not your budget.

The ZITRIOM Office Chair Gas Lift Cylinder Replacement is a heavy-duty, universal hydraulic piston designed to fit most executive and desk chairs in North America. Measuring 15 inches fully extended with a 1.1-inch stroke, it supports up to 150kg and offers smooth, noiseless 360-degree rotation. Easy to install in under 10 minutes, it revitalizes your chair’s height adjustment and mobility with a durable build backed by a 5-year warranty and hassle-free replacement guarantee.

Specifications

ASIN	B01D4YBFBQ
Batteries	1 AA batteries required.
Best Sellers Rank	#820,264 in Office Products ( See Top 100 in Office Products ) #4,797 in Office Chairs & Sofas #8,907 in Home Office Desk Chairs
Customer Reviews	4.2 4.2 out of 5 stars (2,333)
Date First Available	March 18, 2016
Item Weight	1.92 pounds
Item model number	zt1
Product Dimensions	13 x 3 x 3 inches

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