Description

FS-Curtis ES50 Bare Pump | 5-7.5 HP Single-Stage Cast Iron Air Compressor Pump | Part # FES50B

Short Product Description

The FS-Curtis ES50 Bare Pump (Part #FES50B) is a premium industrial-duty single-stage reciprocating air compressor pump engineered for 5 to 7.5 horsepower compressor systems. Constructed from heavy-duty cast iron and designed to operate between 500 and 1,000 RPM, the ES50 delivers reliable compressed air while minimizing wear for long service life.

Whether you're replacing a failed compressor pump or building a custom air compressor package, the ES50 offers the durability, efficiency, and proven reliability expected from FS-Curtis. Its slow-speed design, generous lubrication capacity, and robust construction make it an excellent choice for commercial garages, manufacturing facilities, woodworking shops, and industrial maintenance operations.

Full Product Description

The FS-Curtis ES50 Bare Pump is built for professionals who need dependable compressed air every day. Designed for compressors in the 5 to 7.5 HP range, this heavy-duty cast iron pump combines rugged construction with low operating speeds to maximize reliability and service life.

Unlike lightweight aluminum pumps commonly found on consumer-grade compressors, the ES50 features an industrial cast iron design that dissipates heat efficiently while resisting wear under continuous operation. Operating between 500 and 1,000 RPM, the pump experiences less internal stress than high-speed alternatives, resulting in quieter operation, lower operating temperatures, and extended component life.

The ES50 is ideal for replacing worn pumps on existing compressor packages or for OEMs and fabricators building custom compressed air systems. With its 2A flywheel configuration, 3/4" BSPP discharge connection, and 1.5-quart oil capacity, installation is straightforward for many commercial compressor applications.

For decades, FS-Curtis has built compressors trusted by industrial professionals throughout North America. The ES50 continues that tradition by delivering dependable compressed air production with minimal maintenance requirements.

Key Features

• Genuine FS-Curtis OEM bare compressor pump
• Designed for 5 to 7.5 HP compressor systems
• Heavy-duty cast iron construction
• Industrial single-stage reciprocating design
• Slow operating speed of 500-1,000 RPM
• Splash-lubricated crankcase
• 2A flywheel configuration
• 3/4" BSPP discharge connection
• 1.5-quart oil capacity
• Excellent replacement for worn or damaged compressor pumps
• Designed for long service life in demanding industrial environments

Benefits

• Longer pump life thanks to slow-speed operation
• Heavy cast iron construction withstands years of industrial use
• Lower operating temperatures help improve reliability
• Easy replacement for many existing compressor packages
• Ideal foundation for custom-built compressor systems
• Genuine OEM quality from one of the industry's most respected manufacturers
• Simple maintenance and dependable operation
• Built for continuous commercial and industrial service

Best For / Typical Applications

The FS-Curtis ES50 is ideal for:

• Automotive repair shops
• Fleet maintenance facilities
• Tire service centers
• HVAC contractors
• Manufacturing plants
• Woodworking shops
• CNC equipment
• Agricultural operations
• Industrial maintenance departments
• Custom compressor builders
• Compressor rebuild projects

Technical Specifications

Why Choose the FS-Curtis ES50?

When replacing a compressor pump, durability matters. The ES50 is engineered for long-term reliability using industrial-grade cast iron components and a slow-speed operating design that reduces heat buildup and internal wear.

Whether you're restoring an existing compressor or assembling a custom package, the ES50 provides the proven performance and build quality professionals have trusted from FS-Curtis for generations.

Why Buy from Compressed Air Advisors Online?

Compressed Air Advisors Online specializes exclusively in industrial compressed air equipment. Our experienced team helps customers select the correct replacement pumps, compressors, dryers, filters, and accessories for virtually every application.

When you purchase from us, you receive:

• Expert technical support
• Genuine FS-Curtis OEM products
• Competitive pricing
• Fast nationwide shipping
• Knowledgeable assistance before and after the sale
• Personalized recommendations for replacement and upgrade applications

If you're unsure whether the ES50 is the correct replacement for your compressor, our compressed air specialists are happy to help.

Frequently Asked Questions

Is the FS-Curtis ES50 a complete compressor?

No. The ES50 is a bare compressor pump only. It does not include the electric motor, air tank, belt guard, pressure switch, or mounting hardware.

What horsepower motor is this pump designed for?

The ES50 is designed for compressors using 5 to 7.5 horsepower electric motors.

Is this an OEM FS-Curtis replacement pump?

Yes. Part number FES50B is a genuine FS-Curtis OEM compressor pump.

What type of compressor is the ES50?

The ES50 is a single-stage reciprocating air compressor pump designed for industrial and commercial applications.

What discharge connection does the ES50 use?

The pump features a 3/4-inch BSPP discharge connection.

What RPM should this pump operate at?

The recommended operating speed is 500 to 1,000 RPM.

Can this pump replace another brand of compressor?

In many cases, yes. Compatibility depends on mounting dimensions, pulley ratio, flywheel configuration, motor horsepower, and system requirements.

Is oil included?

No. Compressor oil is sold separately.

Click Here To Download FS Curtis ES-50 Tech Data

Click Here To Download FS Curtis ES-50 Dimensions