Primary Impact Crushers

A solid performer since its ground-breaking introduction, the Stedman Mega-Slam horizontal impactor effectively handles large feed sizes - beyond the range of secondary HSI crushers.

Mega-Slam primary impact crushers are engineered for low maintenance and feature simplified interior access to breaker bars, primary and secondary aprons, and side liners, maximizing production uptime. Our line of HSI’s features the thickest housing liners in the industry.

What is a primary impact crusher?

A primary impact crusher is a machine that uses striking as opposed to pressure to reduce the size of a material. Primary crushers are used within the first stage of processing and produce higher reduction ratios.


Horizontal Impactor Applications

  • Aggregate Industry: Common materials that Mega-Slam HSI can crush include limestone, asphalt, gravel and more
  • Brick & Clay Industry: Horizontal impactor applications and materials for this industry include brick, shale and more
  • Industrial Applications: Mega Slam Impact Crushers often reduce the size of lead slag, aluminum dross and more

Mega-Slam™ HSI Models

ModelFeed Size (Max)Capacity
(TPH - Tons per Hour)
Horsepower (HP) 
MS4230 20" 100-125 75-100 Quote »
MS4260 24" 125-200 100-200 Quote »
MS4860 30" 200-300 350-400 Quote »
MS5460 36" 300-500 450-500 Quote »
MS6460 40" 500-700 600-900 Quote »
MS6490 40" 700-1200 700-1000 Quote »

Capacities vary depending on feed size, feed rate, operating conditions, desired product output, characteristics of feed material, and equipment configuration

Mega Slam HSI Benefits

  • Dependable product control and rugged wear parts
  • Standard rear apron spring bridge assembly assures accurate product control
  • Hydraulic pump allows one person opening of the hinged rear housing
  • Side doors, double rear doors and large roof hatch permit unexcelled access for inspection and adjustment of gap settings
  • Hydraulic assist pump allows easy gap adjustment for both aprons, assuring superior product control
  • CE and TUV compliant

Mega Slam Horizontal Impactor Features

  • Reduction ratios up to 20:1
  • 360° Bearing contact = long bearing life
  • Features 2” thick housing liners
  • Solid Rotor with 3 or 4 breaker bar rows
  • Manual or power assist apron adjustment
  • Max-Yield™ automatic apron adjustment system
  • Reversible manganese monoblock aprons
  • Interchangeable side liners


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Test Before You Buy!

Why Test?

Stedman's testing facilities provide real-world conditions to view your materials being processed. Test out a range of different size reduction methods, saving you both time and money when selecting the proper size reduction method.

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Additional Resources

Why Stedman?

Delivering equipment and service you deserve

For nearly two centuries, Stedman Machine Company has produced quality, reliable and durable size reduction and industrial crushing equipment. Stedman has expert field service and installation technicians ready to assist with all maintenance and equipment commissioning needs.

  • Unsurpassed industry experience – operating since 1834
  • State-of-the-art equipment testing facilities
  • Dedicated, professional staff
  • Parts and service available 24 hours a day


International Capabilities

International Size Reduction Equipment


Stedman Machine has the capability to provide customer service across the globe. Our experienced team will work with you to create the best impact crusher system to make your processes the most efficient. Call us for more information!

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