Gray Flange Gaskets - Grainger Industrial Supply

Previously Purchased

In Stock at Branch

Gasket Material

EPDM (ethylene propylene diene monomer) is a synthetic rubber that resists chemicals, steam, and water.
FKM (fluoroelastomer) is resistant to oils, chemicals, and corrosive fluids.
Neoprene is a synthetic rubber that resists compression, chemicals, saturated steam, and oils.
Buna-N (nitrile) is a synthetic rubber that is compressible and resists oil, water, and mild chemicals.
PTFE (polytetrafluoroethylene) resists heat, chemicals, and friction.
ePTFE expanded PTFE (polytetrafluoroethylene) resists heat, chemicals, and friction, and is more compressible than standard PTFE.
Graphite has the highest temperature resistance compared to other nonmetal materials in addition to good chemical resistance.
SBR (styrene-butadiene rubber) is a synthetic rubber, also referred to as red rubber, that resists abrasion, water, and inert gases.
Silicone is a flexible synthetic rubber that is electrically insulating and withstands a wide range of temperatures, including high heat.
Aramid is a flexible, compressed, synthetic fiber that resists wear, heat, and insulates against electrical current.

Graphite

Gasket Type

Ring Gasket fits inside the bolt area of a flange and is typically used on raised-face (RF) flange. It can be dropped into a flange assembly without fully disassembling the joint.
Full-Face Gasket covers the full surface area of the flange with holes to insert and align the flange bolts. The joint must be fully disassembled to install.

Resistance Properties

Chemical-Resistant
Heat-Resistant
Temperature-Resistant

For Flange ANSI Class

The ANSI class rating of the flange that will work with the gasket. ANSI class ratings specify the maximum amount of pressure the pipe can withstand at increasing temperatures. The higher the class rating, the more pressure the flange can withstand.

For Pipe Size

The nominal pipe size that fits the gasket. This is not a measurement but an industry-accepted standardized size based on the pipe's inside diameter (ID).

1/2 in
3/4 in
1 in
1-1/4 in
1-1/2 in
2 in
2-1/2 in
3 in
4 in
5 in
6 in
8 in

Inside Diameter

27/32 in
1-1/16 in
1-5/16 in
1-21/32 in
1-29/32 in
2-3/8 in
2-7/8 in
3-1/2 in
4-1/2 in
5-9/16 in
6-5/8 in
8-5/8 in

Outside Diameter

1-7/8 in
2-1/8 in
2-1/4 in
2-5/8 in
2-7/8 in
3 in
3-1/4 in
3-3/8 in
3-1/2 in
3-3/4 in
3-7/8 in
4-1/8 in
4-1/4 in
4-3/8 in
4-5/8 in
4-7/8 in
5 in
5-1/8 in
5-1/4 in
5-3/8 in
5-7/8 in
6 in
6-1/8 in
6-1/2 in
6-7/8 in
7 in
7-1/8 in
7-1/2 in
8-1/4 in
8-3/4 in
9 in
9-7/8 in
10 in
11 in
12-1/8 in
12-1/2 in
13-1/2 in
15 in

Thickness

The thickness of the gasket measured in inches. Thinner gaskets handle higher compression stress but require a more finished flange surface. Thicker gaskets help fill surface irregularities and absorb vibration, but allow more room for leaks to permeate and may require retightening. As a general rule, the thinnest gasket possible should be selected to fit the needs of the application.

1/16 in
1/8 in

FDA Approved

Meets FDA standards for use in food, beverage, and pharmaceutical applications.

Metal Detectable

The gasket material is imbedded with steel particles to ensure metal detection devices can find gasket remnants should they enter the pipe system.

X-Ray Detectable

Indicates the gasket material is detectable on x-ray devices should remnants enter the pipe system. X-ray detects all foreign matter in addition to metal.

Minimum Operating Temperature

-400 °F
-100 °F

Maximum Operating Temperature

390 °F
400 °F
800 °F
975 °F

Maximum Operating Pressure

150 psi
300 psi
1,200 psi

Number of Bolt Holes

The number of bolt holes on the gasket that align with the number of mounting bolt holes on the flange fitting.

Bolt Hole Diameter

5/8 in
3/4 in
7/8 in
1 in

Bolt Circle Diameter

The diameter of the bolt hole centers, measured from the outer edge to the inner edge of bolt holes that sit directly opposite from each other on the flange.

2-3/8 in
2-3/4 in
3-1/8 in
3-1/2 in
3-7/8 in
4-1/2 in
4-3/4 in
5-1/2 in
5-7/8 in
6 in
6-5/8 in
7-1/2 in
7-7/8 in
8-1/2 in
9-1/2 in
10-5/8 in
11-3/4 in
13 in

Hardness

Also known as durometer, measures the elasticity of a material created by force: a lower durometer rating indicates a flexible and soft rubber, while a higher durometer rating indicates a harder rubber. Softer rubbers are measured on the A scale, whereas harder rubbers are measured on the D scale or Rockwell R scale.