About Casteel MFG., INC.

Our Founder's Journey

Frank Castillo arrived from Mexico at the age of 12 without knowing a single word of English.

Through dedication and determination, he worked hard in school, learned English, and pursued trade skills at Fox Tech High School. Encouraged by his father, Frank took sheet metal and welding classes, graduating with hands-on skills that would shape his future.

After high school, Frank worked multiple sheet metal fabrication jobs while serving in the Air Force Reserves. Following two layoffs in six months, he took a leap of faith—with his wife’s support—to start his own company.

In December 1980, Casteel Manufacturing was born in a two-car garage.

Growth & Success

Frank’s reputation for hard work, expertise, and problem-solving earned him strong relationships—even with competitors who helped him by renting equipment in the early years.

Casteel quickly expanded:

Early Years: Operated from a rented warehouse for 4 years.
1985: Built the current fabrication shop at 3747 Pitluk Avenue, San Antonio, TX.
Today: Two fabrication areas + office space, recognized as one of San Antonio’s top sheet metal and stainless steel fabrication shops.

A New Chapter

In 2024, Julio Gamez became the new owner, continuing Casteel’s tradition of quality stainless steel and sheet metal fabrication in South Central Texas.
Julio’s leadership focuses on:

Expanding custom fabrication offerings
Maintaining 99% repeat customer base
Building on over 47 years of industry experience

Our Clients

We are proud to serve a long list of repeat customers, including:

Bartlett Cocke General Contractors • Commercial Kitchen • D. Wilson • F.A. Nunnelly • Guido Construction • J.C. Stoddard General Contractors • Joeris General Contractors • Joe’s Industrial Machine Shop • Leonard Contracting • Marksmen General Contractors • Sharp Glass • SpawGlass General Contractors • The Struthoff Company • Twang Partners • UT Health Science Center SA • Weaver and Jacobs

To play, press and hold the enter key. To stop, release the enter key.

Facilities & Capabilities

Shop Size: 18,000 sq. ft.
Workforce: ~10 highly skilled employees
Hours: 8 hrs/day, 5 days/week
Investment: $500,000+ in equipment for quality and efficiency

Key Equipment

Press Brakes: 10' 125 Ton • 12' 90 Ton • 10' 60 Ton • 6' 25 Ton
Punch Presses: 33 Ton • 20 Ton
Iron Worker: 66 Ton
Shears: 10' 3/8 • (2) 10' 10 Ga.
Forklifts: 20,000 lb • (2) 4,000 lb • (3) 1,500 lb
Saws: 10" & 14" Horizontal (Wet) • 14" Cut-Off (Dry)
Rollers: 48" Power • 72" Power • 36" Hand
Welding: (13) Heliarc, ARC & MIG
Other: Air Compressors (3) • Thermal Arc Plasma Cutter • Grinders & Polishers

Let’s Work Together