Founded in 1968 and based in Milwaukee, Wisconsin, Triangle Tool LLC is a premier, full-service provider of custom injection molds, large-format machining, and specialty tooling solutions. From multi-cavity molds and stack tooling to heavy machining and fluid-end components, TT specializes in large, tight-tolerance, highly detailed work others can’t take on. Our team provides full-service support, design, build, machining, assembly, and sampling to ensure every project is delivered with the quality and reliability our customers expect.
A-1 Tool Corporation
Established in 1946, A1 Tool Corporation is a U.S.-based leader in complex plastic injection mold manufacturing, with a legacy built on precision, performance, and long-term customer partnerships. From high-output bucket and thin-wall packaging molds to multi-shot, multi-action, stack, tandem, modular, and T-molds (toggle), A1 engineers and builds tooling systems designed for durability, efficiency, and optimized production performance. Our vertically integrated team of engineers, designers, CNC and EDM machinists, and master toolmakers supports every phase of the mold lifecycle — from concept and DFM guidance through build, validation, refurbishment, and ongoing service. With advanced automation, rigorous inspection protocols, and a culture rooted in craftsmanship, A1 delivers tooling systems that meet demanding cycle times, tight tolerances, and high cavitation requirements. Supporting our mold building expertise is in-house injection molding capacity for tryouts, sampling, validation, and production support, allowing our team to conduct thorough mold testing, refine process parameters prior to launch, and support bridge, short-run, or contract manufacturing as needed. By combining advanced engineering, precision manufacturing, and hands-on molding experience, A1 ensures every tool leaves our facility production-ready and aligned with customer performance goals. For nearly eight decades, A1 has been trusted by leading manufacturers who demand reliability, repeatability, and long-term production success. We don’t just build molds — we build performance-driven production systems designed to run.