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Yellow composite pneumatic polisher with lever throttle and rear exhaust

DYNABRADE

DYNABRADE 57550 Air Polisher 1/4 in NPT Composite 0.3 hp 2400 RPM 18 cfm 90 psi

SKU CH-4KYW-M7DW3

Air polisher with rotary motion, 0.3 hp, 2400 RPM, 18 cfm at 90 psi, 1/4 in NPT inlet, 3 in hook-and-loop pad

  • 3 hp motor delivers consistent rotary polishing power
  • 2400 RPM fixed speed suits heavy-duty finishing tasks
  • 18 cfm air consumption at 90 psi for efficient operation
  • 1/4 in NPT inlet with 1/4 in hose requirement for simple hookup
  • Rear exhaust directs airflow away from the work surface

Purpose & User

The Dynabrade 57550 is a pneumatic rotary polisher built for heavy-duty surface finishing. It suits technicians and detailers who need consistent 2400 RPM performance on 3-inch discs for polishing, buffing or light sanding tasks in automotive or industrial settings.

Build & Connections

A composite housing keeps the tool lightweight while resisting shop chemicals and impacts. The 1/4-inch NPT air inlet and 1/4-inch minimum hose size connect to standard shop supply lines, while the hook-and-loop pad mount allows quick disc changes without tools. Rear exhaust directs airflow away from the work surface and the operator.

Thermals Noise Power

At 90 psi the motor draws 18 cfm, delivering 0.3 hp with minimal vibration during extended runs. Fixed-speed operation eliminates throttle hunting, so airflow and sound levels stay steady. The rear exhaust design reduces perceived noise at the operator's ear while preventing heat build-up on the polishing head.

How it compares

Measured against everything we stock in Air & Hydraulic Power Tools, at today’s prices. Recalculated every night.

Price $480.99
Pricier than about 86% of the 243 comparable items (median $61.99).

Specifications

Product
Brand nameDYNABRADE

Questions about this item

What does the 1/4 in NPT air inlet require for airflow?

The 1/4 in NPT inlet needs a 1/4 in minimum hose and 90 psi supply to deliver the rated 18 cfm at 2,400 RPM.

What spindle and pad combination fits this polisher?

A 1/4 In.-20 spindle thread accepts 3 in hook-and-loop pads, which are the only diameter the tool supports.

How is the polisher connected and what step is often missed?

Attach a 1/4 in hose to the NPT inlet, set the regulator to 90 psi, then fit the pad onto the 1/4 In.-20 spindle before pulling the lever throttle.

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