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HSI - Horizontal Shaft Impactor

Mega Slam Primary Impact Crusher

The primary impact crusher is 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 horizontal impactors features the thickest housing liners in the industry.

Primary Impact Crushers Models:

  • MS4230
  • MS4260
  • MS4860
  • MS5460
  • MS6460
  • MS6490
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Mega-Slam™ Primary Impact Crusher Units Specifications 

Mega-Slam™ HSI Models
Model Feed Size (Max) Capacity
(TPH - Tons Per Hour)
Horsepower (HP)  
MS4230 20" 100-125 75-100 Request Information
MS4260 24" 125-200 100-200 Request Information
MS4860 30" 200-300 350-400 Request Information
MS5460 36" 300-500 450-500 Request Information
MS6460 40" 500-700 600-900 Request Information
MS6490 40" 700-1200 700-1000 Request Information

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


Stedman Machine Company’s line of size-reduction equipment is found in industries and applications from A-to-Z. In fact, it would be easier to list the industries that don’t employ some type of size-reduction equipment!


Rock & Aggregate Crushers

rock & aggregate crushers

Specialty uses of limestone include the manufacturing of pharmaceuticals, toothpaste, paint, paper, caulking, and glass.

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Energy & Biomass Pulverizers

energy & biomass pulverizers

One of the first uses for the cage mill was as a coal pulverizer. By 1900 Nathan Stedman had built more than 100 cage mills designed to crush coal.

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Ceramic & Brick Clay Crushers

ceramic & brick clay crushers

Stedman revolutionized material preparation for the brick, clay, and ceramic industries by introducing more cost-efficient processes.

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Size reduction for a variety of minerals

mining industry crushers

Stedman crushers, mills, and grinders are used in nearly every mineral and mining industry. Whether you are processing coal, rock, salt, iron ore, wood chips or clay, we have your solution to size reduction.

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Industrial Food Rendering Crushers

industrial food rendering crushers

Stedman ensures nothing goes to waste by delivering reliable, durable pulverizers and crushers perfect for handling food waste and food rendering.

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Agricultural Crushers

agricultural crushers

Stedman delivers high-performing pulverizers crushers perfect for agricultural uses including crushing lime, processing animal feed, and reducing grain corn.

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Industrial Herb & Spice Crushing Equipment

industrial herb & spice crushing equipment

Stedman delivers high-performing, low-maintenance pulverizers crushers ideal for large-scale grinding, milling, and processing of herbs and spices.

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Grain Processing Equipment for Distilleries

distillery grain processing equipment

Stedman delivers high-performing, low-maintenance pulverizers & crushers ideal for large-scale grinding and milling grain and corn to supply distilleries.

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Fertilizer Crushing Equipment

fertilizer crushing equipment

Stedman’s reliable, durable lump breakers, chain mills, and cage mills are expertly engineered, sturdily constructed, and rigidly tested to meet the specifications you require for heavy-duty fertilizer processing and size reduction.

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Test Before You Buy™

The Stedman Testing and Toll Processing Facility is the place to test your material in our full size equipment. If it can be crushed, ground, pulverized or mixed, chances are we’ve done it. We have more than 10,000 test reports to help get you to the best solution quickly. To learn more about what to expect from testing, read our article that ran in POWDER BULK ENGINEERING magazine.

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Additional Information 

Delivering equipment & 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

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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Our 24 hour parts and service department along with our inventory of wear parts allow us to provide the fastest response time for parts and service.

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