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Blue aramid ring gasket, flat circular shape, 1/16 inch thick

Value Brand

Value Brand 4 in 1/16 in Aramid Ring Gasket Blue

SKU CH-ZCFP-KCAXS

An aramid ring gasket with Buna-N binder for 4-inch ANSI Class 150 flanges, rated from -100 to 750 degrees F

  • Aramid construction resists temperatures up to 750°F
  • Buna-N binder performs down to -100°F
  • ANSI Class 150 rating fits standard flanges
  • 1/16 in thickness provides reliable sealing
  • Blue colour aids quick visual identification

4-inch ANSI Class 150 Aramid Ring Gasket

This blue aramid ring gasket is built for 4-inch piping systems that conform to ANSI Class 150 flanges. It suits maintenance crews and plant operators who need a reliable seal in standard industrial pipework. The gasket arrives with Grade A zinc-plated carbon-steel bolts included, so installation can proceed without sourcing separate hardware. Its construction targets general-purpose flange connections where non-metallic sealing is specified.

Temperature and pressure envelope

The gasket operates continuously from -100 °F up to 750 °F, covering cryogenic lines and high-temperature steam or process media. Its 1/16-inch thickness and aramid composition with Buna-N binder determine the practical sealing load the flange assembly can develop. Because the hardness is not rated, designers must verify bolt torque and surface finish against their own piping code rather than relying on a published compression value. The Class 150 rating sets the maximum pressure boundary for the flange pair, not the gasket alone.

4 3/8-inch inside diameter

The 4 3/8-inch bore matches the nominal 4-inch pipe size and aligns with the ANSI Class 150 bolt circle when centred on the flange faces. If the pipe bore or flange facing differs from this dimension, the gasket will not seal correctly and a different ring size is required. No other diameter in the data will compensate for a mismatch at this critical sealing surface.

How it compares

Measured against everything we stock in Drain Cleaners & Plumbing Tools, at today’s prices. Recalculated every night.

Price $15.99
Cheaper than about 82% of the 1,087 comparable items (median $57.99).

Specifications

Product
Brand nameZORO SELECT

Questions about this item

Which thickness should I choose for a 4-inch ANSI Class 150 flange?

The 1/16-inch thick aramid ring gasket matches the 4-inch nominal pipe size and ANSI Class 150 flange rating listed in the specifications.

What does the 750-degree Fahrenheit maximum temperature mean once the gasket is installed?

It indicates the highest continuous service temperature the aramid material with Buna-N binder can withstand without degradation in the piping system.

How does the ANSI Class 150 rating limit the gasket in practice?

The Class 150 designation caps the maximum allowable pressure at the operating temperature, so the gasket must be used within those pressure-temperature limits for the 4-inch flange.

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