MDC Vacuum 402500 100-75CRNF Conical Reducer 1" to 3/4" NF Vacuum Fitting

MDC Vacuum 402500 100-75CRNF Conical Reducer 1" to 3/4" NF Vacuum Fitting

The MDC Vacuum Products 402500 is a conical reducer vacuum fitting that transitions a 1-inch NF vacuum line down to a 3/4-inch NF connection. MDC Vacuum Products Corporation (headquartered in Hayward, CA) manufactures precision vacuum components widely used in research and industrial high-vacuum systems. This reducer features a tapered conical body with a metal flange and elastomer seal ring at the base, providing a reliable vacuum-tight transition between different line sizes.

Specifications & What's Included

• Part Number: 402500
• Model: 100-75CRNF
• Type: Conical reducer, NF vacuum fitting
• Inlet size: 1 inch (1.00")
• Outlet size: 3/4 inch (0.75")
• Connection standard: NF (vacuum flange)
• Body: Metal (aluminum) with elastomer base seal
• Manufacturer: MDC Vacuum Products Corporation, Hayward, CA
• Condition: New, unused open-box surplus

Applications

Conical vacuum reducers like the MDC 100-75CRNF are used wherever a vacuum system requires a line-size transition — connecting a larger-diameter vacuum line or component to a smaller port without breaking vacuum integrity. These fittings are common in research labs, semiconductor fabrication equipment, surface science systems, thin-film deposition chambers, and general high-vacuum or rough-vacuum plumbing setups. MDC Vacuum Products has supplied vacuum hardware to universities, national laboratories, and industrial facilities since the 1960s, and their NF-series fittings remain a standard choice for flexible vacuum line assemblies. This reducer is suited for any application where a 1-inch to 3/4-inch NF size transition is needed.