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Mercury H-21S Hercules Floor Sander Machine – 1.5 HP Sealed Motor, 175 RPM

Mercury H-21S Hercules Floor Sander Machine – 1.5 HP Sealed Motor, 175 RPM

Brand: Mercury Floor MachinesSKU: H-21SIn Stock – Ready to Ship
$3,309.00
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21-Inch Commercial Floor Sander with Sealed Motor – Mercury H-21S Hercules

The Mercury H-21S Hercules is a 21-inch commercial floor sander machine built for large-area wood refinishing and sanding in commercial and industrial settings. Its 1.5 HP sealed motor with dual capacitors runs at 175 RPM, drawing 15 amps in a sealed housing that protects bearings from dust infiltration — extending service intervals on heavy-use sanding schedules. The polished aluminum chassis keeps weight at 108 lbs while maintaining the rigidity needed for consistent abrasive contact across wide floor areas.

H-21S Motor, Speed, and Sanding Performance

  • 1.5 HP AC sealed motor with 2 capacitors — sealed bearing design blocks wood dust from motor internals, reducing maintenance frequency compared to open-frame motors on heavy sanding operations.
  • 175 RPM brush/disc speed — the operating speed is optimized for controlled material removal on wood flooring without excessive heat buildup that can scorch finishes.
  • 21-inch apron/working width — the wide working path reduces the number of passes required to cover large commercial floors, improving productivity on gym floors, ballrooms, and warehouse office spaces.
  • 15-amp motor draw — operates on a standard 15-amp commercial circuit, allowing use in most commercial facilities without dedicated high-amperage electrical service.
  • Polished aluminum chassis — lightweight structural material provides stiffness for consistent drum-to-floor contact while keeping total machine weight at 108 lbs.

Commercial and Industrial Sanding Applications

School gymnasium floor refinishing contractors use the H-21S for seasonal resanding of hardwood gym floors where the 21-inch path reduces total passes on large open areas. Commercial flooring installers use it for surface prep on wide-plank hardwood and engineered wood installations in offices and retail spaces. Hotel renovation teams use it for ballroom and event space floor refinishing between renovation cycles. Industrial facility managers use it for wood mezzanine and warehouse office floor maintenance where consistent surface prep is required before refinishing.

Warranty and What Ships in the Box

5-year warranty on motor, transmission, and chassis. Ships with: Mercury H-21S machine unit, operator documentation, and standard accessory set. Seal bearings are serviceable per Mercury's maintenance schedule.

Model H-21S
Apron Size 21 inches
Motor 1.5 HP AC, 2 capacitors, 15 amp
Brush Speed 175 RPM
Weight 108 lbs
Chassis Polished aluminum
Warranty 5 years (motor, transmission, chassis)
Brand Mercury Floor Machines

Manufacturer's Warranty

This product comes with a full manufacturer's warranty. All warranty claims are handled directly by the manufacturer.

For specific warranty details, please contact us at +1 (978) 295-7538 or email info@uscleaningtools.com

B2B & Tax-Exempt Purchases

We supply contractors, restoration companies, property managers, schools, government agencies, and other tax-exempt organizations.

How to place a tax-exempt order:

  1. Write to us through our Contact Us page or email info@uscleaningtools.com and attach your valid tax exemption certificate (state resale or exemption certificate).
  2. We verify your certificate and mark your account tax-exempt — usually within one business day.
  3. Place your order and sales tax will not be charged.

For volume pricing or purchase orders, call +1 (978) 295-7538.

Shipping & Returns

Free shipping on most brands for orders over $300, delivered to the lower 48 states. Any brand-specific freight rate is shown at checkout before you pay.

Processing & delivery: in-stock orders are processed within 1–2 business days and typically deliver in 5–7 business days. Tracking is emailed within 24 hours of shipment. Built-to-order and backordered equipment shows its lead time on this page.

Freight deliveries: inspect your equipment on arrival and note any damage on the delivery receipt. Items damaged in transit or defective on arrival are fully covered at no cost to you.

Cancellations: cancel any time before your order ships for a full 100% refund.

30-day returns: return unused equipment in its original packaging within 30 days of delivery. Change-of-mind returns are subject to a restocking fee. To start a return, email info@uscleaningtools.com or call +1 (978) 295-7538.

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Mercury H-21S Hercules Floor Sander Machine – 1.5 HP Sealed Motor, 175 RPMMercury H-21S Hercules Floor Sander Machine – 1.5 HP Seal...
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Frequently Asked Questions

Why does the H-21S use a sealed motor?
A sealed motor housing prevents fine wood sanding dust from infiltrating the bearings and motor windings. In heavy commercial sanding operations, open motors require more frequent servicing; the sealed design on the H-21S reduces maintenance intervals and extends motor life.
What is the working width of the H-21S?
The H-21S has a 21-inch apron size, covering a 21-inch working path per pass. This wide coverage reduces total passes needed on large commercial floors like gymnasiums, ballrooms, and warehouse office spaces.
What warranty does Mercury provide on the H-21S?
Mercury covers the H-21S with a 5-year warranty on the motor, transmission, and chassis — one of the most comprehensive warranties in the commercial floor sander category.
What is the amp draw and can it run on a standard commercial circuit?
The H-21S draws 15 amps at the rated 1.5 HP load. It runs on a standard 15-amp commercial circuit, making it compatible with most commercial facilities without requiring dedicated high-amperage wiring.
What type of abrasives can the H-21S use?
The H-21S accepts standard 21-inch floor sanding discs and pads compatible with Mercury's apron specifications. Contact Mercury or your distributor for the recommended grit sequence for your specific wood species and finish removal application.

Frequently Asked Questions

1. What payment methods can I use?

We accept Visa, MasterCard, American Express, Diners Club, Discover, major debit cards, and digital wallets like PayPal, Google Pay, Meta Pay, and Apple Pay.

2. When will my payment be processed?

Your credit/debit card or PayPal account will be charged when you place your order. Secure payment processing protects your information.

3. Will I receive an order confirmation?

Yes, a confirmation email will be sent to the provided email address once the order is placed.

4. How long does it take to process an order?

Orders are processed within 1-2 business days and then prepared for shipment.

5. How long does it take for my order to arrive?

Estimated arrival time (ETA) is 5-7 business days for all orders.

6. Do you offer warranty?

All our products come with a manufacturer warranty of at least 1 year, depending on the brand.

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