Chicago Harware and Fixture Company
A family owned company that specializes in the manufacture of drop forged and turned wire hardware for, but not limited to, Commercial construction, Industial and Marine applications.

The Caldwell Group
A collection of brands that specialize in standard and custom manufacturing of industrial lifting and material handling devices.

Gunnebo Johnson Corporation
Gunnebo manufactures Grade 80 & 100 chain, chain sling components and fittings. Johnson manufacturers crane blocks, sheaves and components. A wide variety of these products are stocked at Prime Line's warehouse in West Springfield, MA.