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Black Viton full-face flange gasket with four bolt holes

Zoro Select

Zoro Select BULK-FG-478 Full Face Viton Flange Gasket

SKU CH-NMSF-15BES

Full-face Viton flange gasket for 1-inch pipe, ANSI Class 300, rated from -20 to 450 degrees Fahrenheit

  • FKM material resists chemicals up to 450 °F
  • Full-face design seals 1 in pipe at ANSI 300
  • Four 3/4 in bolt holes ensure secure fit
  • 1/8 in thickness provides reliable compression sealing
  • Operates from -20 °F for cold environments

Full-Face Viton Flange Gasket

This full-face Viton flange gasket fits 1-inch pipe and ANSI Class 300 flanges. It provides a chemical-resistant seal for process piping and equipment connections. The FKM material handles aggressive fluids and temperatures from minus 20 to 450 degrees Fahrenheit. The gasket arrives new and ready for installation.

Suits high-temperature chemical lines.

Maintenance teams and plant engineers use this gasket on 1-inch Class 300 flanges where Viton resistance is required. Buyers needing a different pipe size, bolt pattern or pressure class must select another part. The four-bolt-hole layout matches only the stated standard.

1-inch pipe, Class 300, four bolt holes

The decisive specification is the combination of 1-inch pipe size, ANSI Class 300 rating and four bolt holes measuring 3/4 inch each. Confirm these three values against your flange drawing before ordering. Incorrect matching will prevent a proper seal.

Highlights

  • FKM material resists chemicals up to 450 °F
  • Full-face design seals 1 in pipe at ANSI 300
  • Four 3/4 in bolt holes ensure secure fit
  • 1/8 in thickness provides reliable compression sealing
  • Operates from -20 °F for cold environments

Specifications

BrandZORO SELECT

Questions about this item

Will the 1/8" thick Viton gasket seal properly against the worn surface of my existing ANSI Class 300 flange?

The 1/8" thickness provides conformability to minor surface imperfections, and the FKM material maintains sealing force across the -20°F to 450°F range on ANSI Class 300 flanges.

How can I verify the gasket is seated correctly after bolting up the 4-hole pattern?

After torquing the four 3/4" bolts in a cross pattern, check for uniform bolt stretch and zero visible leakage at the 4 7/8" OD during hydrostatic test.

Does the box include the four 3/4" bolts needed for the ANSI Class 300 flange, or must I supply them?

Fasteners are not included; you must supply four bolts matching the 3/4" hole diameter and your flange thickness.

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