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General Sheet Metal Works, inc. is a full line metal service and retail metal supply center that serves Northeast Iowa.

We offer a well-stocked retail center and warehouse filled with an extensive selection of metals. Our customer list has grown to over 500 companies in the Northeast Iowa region. We are consistently told that the personal service GSM provides is unique in the custom fabrication industry and that is what keeps them coming back year after year. We welcome your inquiries regarding metal supply and fabrication, and are ready to serve you at any time.

GSM has roots dating back to 1915, when it was one of Waterloo, Iowa’s early fabricators. The company was then known as Moore Manufacturing. Our founder, Walter M. Widmann worked as a foreman for Moore Manufacturing for many years before purchasing the business. The company was incorporated as General Sheet Metal Works in 1956 and has been operating as GSM ever since. It is currently at the same 217 Rath Street location next to the 18th Street bridge in Waterloo.

Our Team

Dakota, Zach, Buzz, Don, Jon









Stainless Steel
Carbon Steel


Up to 1/4 in thick x 120 in long


Up to 3/8 in thick X 96 in long


Up to 3/8 in thick x 120 in long


Up to 1/2 in thick x 120 in long

Tube Bending

Call for sizes


mill and lathe work per spec

Paint Booth

Custom spray
any finish

CNC Cutting

Cutting area
68 in x 132 in


Custom CNC and Modeling


Click photos for examples


Grain handling systems, equipment repair, trenching accessories, grain storage

Mechanical Ductwork & HVAC

grease duct, air duct, process plant chutes, cones, transitions, square to rounds

Consumer Products

light fixtures, grills, signs, fire rings, tv mounts, Etsy and Pinterest products

Metal Supply

Metal Types

  • Aluminum
  • Hot Rolled Carbon Steel
  • Stainless Steel
  • Galvanized Steel
  • Cold Rolled Steel

Metal Shapes

  • Flat
  • Angle
  • Sheet/Plate
  • Solid Square
  • Solid Round
  • Square Tubing
  • Perforated Metal
  • Tread/Floor Plate
  • Expanded Metal

Sizes (call for availability)

  • 1/4″ to 1/2″ thick, any L/W
  • 1/8″ to 1/4″ thick, any L/W
  • 3/16″ to 10 gauge, any L/W
  • 3/8″ L/W to 7/8″ L/W
  • 3/16″ to 3/4″ diameter, any L/W
  • 1/8″  wall, any L/W/H
  • 3/16″ to 1/2″ thick, any L/W/H 
  • .078″ to .250″ thick, any L/W/H
  • 1/2″ to 3/4″ thick, any L/W/H
  • Additional sizes available


217 Rath St. / P.O. Box 1535 Waterloo, IA 50704

Our hours

Mon-Thurs 8AM – 4:30PM
Fri 8AM – 4PM

Contact us

Phone: 319-234-5428
Fax: 319-234-5026

217 Rath St. / P.O. Box 1535 Waterloo, IA 50704

The GSM Guarantee

We will provide you with: knowledgeable staff who are experienced in metal fabrication, credit lines with good terms, current pricing on materials, and professional design work in order to meet your project needs.

We are in business to save you time and money.

Our Partners & Clients