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Home/Floor Buffers/Mercury DC-21-1170 Ultra D.C. High-Speed Burnisher – 21", 1170 RPM
Mercury DC-21-1170 Ultra D.C. High-Speed Burnisher – 21", 1170 RPM

Mercury DC-21-1170 Ultra D.C. High-Speed Burnisher – 21", 1170 RPM

SKU: DC-21-1170In stock
$2,218.00
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Mercury DC-21-1170 Ultra D.C. Burnisher – 21" Floor Polisher at 1170 RPM

The DC-21-1170 pairs Mercury's largest 21" apron with a 1170 RPM burnishing speed — lower than the DC-21-2000, which makes it the better choice for facilities that burnish daily or multiple times per week. At 1170 RPM, the machine generates less friction heat per pass, which means less thermal stress on the floor finish coat over time.

DC-21-1170 Motor, Speed, and Chassis

  • Motor: 1.5 HP D/C rectified, 15 Amp — eliminates burnouts and handles voltage variation in large facilities
  • Speed: 1170 RPM — lower heat burnishing; gentler on finish coats, suited for frequent burnishing programs
  • Apron size: 21" polished aluminum with full-wrap non-marking bumpers
  • Pad pressure: flexible pad holder with threaded pad-centering device
  • Chassis: polished aluminum, 86 lbs. machine weight
  • Operating wheels: 6" non-marking; transport wheels: 4" non-marking
  • Handle: adjustable 48" — interlock switch, non-conductive dual triggers
  • Power cord: 50-ft. 14/3-gauge safety cord

Where the DC-21-1170 Gets Used

The DC-21-1170 suits large-area floors where burnishing is part of a daily maintenance program rather than a periodic restoration event. Hotel lobbies, convention center floors, grocery store main aisles, and healthcare facility corridors that require daily shine maintenance are the typical applications. At 1170 RPM, the machine is quiet enough to use during light occupancy without significant noise complaints, and the reduced heat cycle means the finish coat can sustain daily burnishing without premature deterioration.

Pro Application Details for the DC-21-1170

The choice between 1170 RPM and 2000 RPM in the DC-21 line comes down to burnishing frequency and finish coat durability goals. Daily burnishing at 2000 RPM generates enough heat to gradually break down the finish polymer structure, requiring re-coating more often. At 1170 RPM, the gloss result is slightly less intense — a satin rather than wet-look — but the finish coat lasts longer before needing stripping and re-coating. Use white or tan pads at 1170 RPM; natural fiber pads also work well. The 21" apron and 86-lb. machine weight give the DC-21-1170 a slight weight advantage over the 84-lb. DC-19-1170 for pad seating on smooth VCT.

Attribute Details
Model DC-21-1170
Motor 1.5 HP D/C Rectified, 15 Amps
Speed 1170 RPM
Apron Size 21"
Chassis Polished Aluminum
Operating Wheels 6" Non-Marking
Transport Wheels 4" Non-Marking
Power Cord 50-ft. 14/3-gauge safety cord
Machine Weight 86 lbs.

Documents

Mercury DC-21-1170 Owners Manual

Mercury DC-21-1170 Wiring Diagram

Mercury DC-21-1170 Part List

Mercury DC-21-1170 Sell Sheet

Video

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

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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.

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Frequently Asked Questions

What is the difference between the DC-21-1170 and DC-21-2000?
Both use the same 21" apron and 1.5 HP DC rectified motor. The DC-21-1170 runs at 1170 RPM, generating less friction heat — better for daily burnishing programs where finish longevity matters. The DC-21-2000 runs at 2000 RPM, producing a brighter wet-look gloss but generating more heat per pass, which can accelerate finish degradation with frequent use.
What pads should I use with the DC-21-1170 at 1170 RPM?
Use white or tan burnishing pads, or natural fiber pads, at 1170 RPM. Do not use black, green, or blue scrubbing pads — those are designed for low-speed operations (175–300 RPM) and will damage the finish at any high-speed burnishing RPM.
How heavy is the Mercury DC-21-1170?
The DC-21-1170 weighs 86 lbs. — 2 lbs. heavier than the DC-19-1170 (84 lbs.) due to the larger aluminum chassis. The additional weight improves pad seating on smooth VCT and similar hard surfaces.
Is 1170 RPM fast enough to produce a high-gloss finish?
Yes. At 1170 RPM, the DC-21-1170 produces a satin-to-semi-gloss finish rather than a wet-look gloss. For facilities that prioritize finish coat longevity and burnish daily, 1170 RPM is the appropriate speed range. For a wet-look gloss, choose the DC-21-2000 at 2000 RPM.
What safety features does the DC-21-1170 include?
The DC-21-1170 includes a safety interlock switch that stops the machine when the handle is released, non-conductive dual triggers to reduce electric shock risk, and full-wrap non-marking bumpers that protect walls and baseboards.
Why is the DC-21-1170 better suited for daily burnishing than the DC-21-2000?
1170 RPM generates less friction heat than 2000 RPM. Daily burnishing at 2000 RPM accumulates enough heat stress on the floor finish over time to cause premature polymer breakdown, requiring more frequent strip-and-recoat cycles. At 1170 RPM, the same daily burnishing program extends the finish coat's useful life.

Parts & Accessories That Fit the Mercury DC-21-1170 Ultra D.C. High-Speed Burnisher

Confirmed-fit wear parts and accessories for this machine. Not sure which you need? Call 9782957538.

Part or accessorySKU
Namco Premier Kote – 1-Gallon, Case of 4 (2030C) 2030C
Namco Beauty Kote – 1-Gallon, Case of 4 (2513C) 2513C
Namco First Kote Floor Sealer – 1-Gallon, Case of 4 (2069C) 2069C

How the Mercury DC-21-1170 Ultra D.C. High-Speed Burnisher Compares to Other Mercury Floor Machines floor machines

The closest 5 models from the 9 Mercury Floor Machines floor machines we carry, by capacity. Not sure which size fits the job? Call +1 (978) 295-7538.

This modelMercury DC-21-1170 Ultra D.C. High-Speed Burnisher Mercury DC-21-1170 Ultra D.C. High-Speed Burnisher
Mercury Floor Machines Ultra DC Burnisher DC-20-1500 Mercury Floor Machines Ultra DC Burnisher DC-20-1500Mercury Floor Machines DC-20-1100 Ultra DC Burnisher Mercury Floor Machines DC-20-1100 Ultra DC BurnisherMercury DC-21-2000 Ultra D.C. High-Speed Burnisher Mercury DC-21-2000 Ultra D.C. High-Speed BurnisherMercury Floor Machines DC-21-1500 Burnisher Mercury Floor Machines DC-21-1500 Burnisher
Price$2,218$2,416$2,316$2,298$2,238
Size21 in20 in20 in21 in21 in
Pad speed1,170 RPM1,500 RPM1,100 RPM2,000 RPM1,500 RPM
Weight86 lb85 lb—89 lb86 lb
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