Selecting and Measuring Expansion Joints
For information about selecting pipe size, see Selecting and Measuring Pipe & Fittings.
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How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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Fiberglass Pipe Flanges for Corrosive Chemicals
- For Use With: Acetic Acid (75%), Alcohol, Calcium Chloride, Chlorine, Fuel Oil, Gasoline, Hydrochloric Acid (37%), Nitric Acid (10%), Oil, Phosphoric Acid, Salt Water (30%), Sodium Hydroxide (50%), Solvents, Sulfuric Acid (70%), Water
- Temperature Range: 32° to 200° F
- Specifications Met: ASTM D4024
Flanges have excellent corrosion resistance to handle a wide range of acids and other highly-corrosive chemicals. Use in metal surface treating applications, plating solution lines, and other chemical process applications. They are reinforced with fiberglass layers for better strength and durability than any of our other pipe flanges for chemicals. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line. Flanges meet ASTM D4024 specifications and testing requirements for product dimensions, performance, and material quality.
To connect flanges to pipe, first sand the inside of the flange and the end of the pipe to remove the surface finish. Next, mix the adhesive (sold separately) until the color is uniform with no streaks. Apply a thin layer of mixed adhesive to the sanded area of the pipe, approximately 1/8” thick. Repeat this process with the inside of the flange, applying a layer approximately 1/16” thick. After sealant has been applied, push the flange onto the pipe until it is fully engaged. Make sure you align the bolt holes prior to installing to minimize rotation after the flange is installed. Finally, use the adhesive-curing heat cable (sold separately) to cure the adhesive. Wrap the tape around the pipe and flange at the joint, taking care to not overlap the tape. Once you have waited the full cure time, the pipe and flange will be ready to use.
Warning: Never use plastic pipe flanges and pipe with compressed air or gas.
For technical drawings and 3-D models, click on a part number.
| Pipe Size  | Socket Dp. | Flange OD | For Bolt Dia. | Bolt Hole Dia. | Number of Bolt Holes | Bolt Circle Dia. | Material | Color | Max. Pressure | Each | |
| 1 1/2 | 1 3/8" | 5" | 1/2" | 5/8" | 4 | 3 7/8" | Fiberglass | Black | 300 psi @ 72° F | 0000000 | 0000000 |
| 2 | 1 3/4" | 6" | 5/8" | 3/4" | 4 | 4 3/4" | Fiberglass | Black | 250 psi @ 72° F | 0000000 | 000000 |
| 3 | 2" | 7 1/2" | 5/8" | 3/4" | 4 | 6" | Fiberglass | Black | 250 psi @ 72° F | 0000000 | 000000 |
| 4 | 2 1/2" | 9" | 5/8" | 3/4" | 8 | 7 1/2" | Fiberglass | Black | 150 psi @ 72° F | 0000000 | 000000 |
| Pipe Cement (11.8-fl. oz. Can) | 0000000 | Each | 000000 |
Cap flanges are also known as blind flanges.
| Pipe Size | Flange OD | For Bolt Dia. | Bolt Hole Dia. | Number of Bolt Holes | Bolt Circle Dia. | Material | Color | Max. Pressure | Each | |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | Fiberglass | Black | 300 psi @ 72° F | 0000000 | 0000000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | Fiberglass | Black | 250 psi @ 72° F | 0000000 | 000000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | Fiberglass | Black | 250 psi @ 72° F | 0000000 | 000000 |
| 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | Fiberglass | Black | 150 psi @ 72° F | 0000000 | 000000 |
| Pipe Cement (11.8-fl. oz. Can) | 0000000 | Each | 000000 |
| Voltage | Max. Heat Output, °F | Lg. | Wd. | Thick. | Plug Type | Cord Lg. | Each | |
| 120V AC | 270° | 6 ft. | 1" | 1/8" | Two Prong | 6 ft. | 0000000 | 0000000 |
Expansion Joints with Flanged Ends
These joints reduce stress, vibration, and noise in piping systems by providing a point of flexibility to absorb movement. The flanged ends rotate for easy bolt hole alignment during installation. They mate with a same-size flat-surface Class 150 flange without the need for a gasket. Joints have a flexible body that is reinforced with nylon for added strength.
Position the expansion joints as close as possible to anchor points. Attach limit rod sets (sold separately) to the flanges to prevent overextension where anchoring is insufficient. To accommodate the thickness of the limit rod mounting plate, use bolts that are 7/8" longer than the bolts connecting the expansion joint to the pipe flange. Each set of limit rods requires eight bolts (not included).
For technical drawings and 3-D models, click on a part number.
- For Use With: Alcohol, Water
- Temperature Range: -20° to 250° F
- Maximum Pressure: 220 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
Expansion Joints | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Distance | Limit Rod Sets | ||||||||||||
| Flange OD | Pipe Size | Lg. | No. of Bolt Holes | Compression | Expansion | Offset | Expansion Joint Type | Flange Material | For Bolt Dia. | Each | Pair | ||
| 5" | 1 1/2 | 6" | 4 | 1/2" | 3/8" | 1/2" | Single Bulb | Zinc-Plated Steel | 5/8" | 0000000 | 000000 | 0000000 | 0000000 |
| 6" | 2 | 6" | 4 | 1/2" | 3/8" | 1/2" | Single Bulb | Zinc-Plated Steel | 3/4" | 0000000 | 00000 | 0000000 | 000000 |
| 7" | 2 1/2 | 6" | 4 | 1/2" | 3/8" | 1/2" | Single Bulb | Zinc-Plated Steel | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 7 1/2" | 3 | 6" | 4 | 1/2" | 3/8" | 1/2" | Single Bulb | Zinc-Plated Steel | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 9" | 4 | 6" | 8 | 3/4" | 1/2" | 1/2" | Single Bulb | Zinc-Plated Steel | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 10" | 5 | 6" | 8 | 3/4" | 1/2" | 1/2" | Single Bulb | Zinc-Plated Steel | 7/8" | 0000000 | 000000 | 0000000 | 000000 |
| 11" | 6 | 6" | 8 | 3/4" | 1/2" | 1/2" | Single Bulb | Zinc-Plated Steel | 7/8" | 0000000 | 000000 | 0000000 | 000000 |
| 13 1/2" | 8 | 6" | 8 | 3/4" | 1/2" | 1/2" | Single Bulb | Zinc-Plated Steel | 7/8" | 0000000 | 000000 | 0000000 | 000000 |
| 16" | 10 | 8" | 12 | 1" | 5/8" | 3/4" | Single Bulb | Zinc-Plated Steel | 1" | 0000000 | 000000 | 0000000 | 000000 |
| 19" | 12 | 8" | 12 | 1" | 5/8" | 3/4" | Single Bulb | Zinc-Plated Steel | 1" | 0000000 | 000000 | 0000000 | 000000 |
Expansion Joints with Sealing Flanged Ends for Plastic Pipe
These joints reduce stress, vibration, and noise in plastic piping systems by providing a point of flexibility to absorb movement. Joints provide a tighter seal than other expansion joints because the flanges are molded into the body for a wide sealing surface. Each flange is supported by a zinc-plated steel plate. Flanges mate with a same-size flat-surface Class 150 flange without the need for a gasket.
Position the expansion joints as close as possible to anchor points. Attach limit rod sets (sold separately) to the flanges to prevent overextension where anchoring is insufficient. To accommodate the thickness of the limit rod mounting plate, use bolts that are 7/8" longer than the bolts connecting the expansion joint to the pipe flange. Each set of limit rods requires eight bolts (not included).
For technical drawings and 3-D models, click on a part number.
- For Use With: Alcohol, Water
- Temperature Range: -20° to 250° F
- Maximum Pressure: 220 psi @ 72° F
- Maximum Vacuum: 24 in. of Hg @ 72° F
Expansion Joints | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Distance | Limit Rod Sets | ||||||||||||
| Flange OD | Pipe Size | Lg. | No. of Bolt Holes | Compression | Expansion | Offset | Expansion Joint Type | Flange Material | Bolt Hole Size | Each | Pair | ||
| 5" | 1 1/2 | 6" | 4 | 1 1/4" | 5/8" | 9/16" | Single Bulb | EPDM Rubber | 5/8" | 0000000 | 0000000 | 0000000 | 0000000 |
| 6" | 2 | 6" | 4 | 1 1/4" | 5/8" | 9/16" | Single Bulb | EPDM Rubber | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 7" | 2 1/2 | 6" | 4 | 1 1/4" | 5/8" | 9/16" | Single Bulb | EPDM Rubber | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 7 1/2" | 3 | 6" | 4 | 1 1/4" | 5/8" | 9/16" | Single Bulb | EPDM Rubber | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 9" | 4 | 6" | 8 | 1 1/4" | 5/8" | 9/16" | Single Bulb | EPDM Rubber | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 11" | 6 | 6" | 8 | 1 1/4" | 5/8" | 9/16" | Single Bulb | EPDM Rubber | 7/8" | 0000000 | 000000 | 0000000 | 000000 |
| 13 1/2" | 8 | 6" | 8 | 1 1/4" | 5/8" | 9/16" | Single Bulb | EPDM Rubber | 7/8" | 0000000 | 000000 | 0000000 | 000000 |
Expansion Joints with Flanged Ends for High Vibration
These expansion joints have a double-bulb design for extra movement and vibration absorption. The flanged ends rotate for easy bolt hole alignment during installation. They mate with a same-size flat-surface Class 150 flange without the need for a gasket. Joints have a flexible body that is reinforced with nylon for added strength.
Attach limit rod sets (sold separately) to the flanges to prevent overextension where anchoring is insufficient. To accommodate the thickness of the limit rod mounting plate, use bolts that are 7/8" longer than the bolts connecting the expansion joint to the pipe flange. Each set of limit rods requires eight bolts (not included).
For technical drawings and 3-D models, click on a part number.
- For Use With: Alcohol, Water
- Temperature Range: -20° to 250° F
- Maximum Pressure: 220 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
Expansion Joints | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Distance | Limit Rod Sets | ||||||||||||
| Flange OD | Pipe Size | Lg. | No. of Bolt Holes | Compression | Expansion | Offset | Expansion Joint Type | Flange Material | Bolt Hole Size | Each | Pair | ||
| 5" | 1 1/2 | 7" | 4 | 2" | 1 3/16" | 1 3/4" | Double Bulb | Zinc-Plated Steel | 5/8" | 0000000 | 000000 | 0000000 | 0000000 |
| 6" | 2 | 7" | 4 | 2" | 1 3/16" | 1 3/4" | Double Bulb | Zinc-Plated Steel | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 7" | 2 1/2 | 7" | 4 | 2" | 1 3/16" | 1 3/4" | Double Bulb | Zinc-Plated Steel | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 7 1/2" | 3 | 7" | 4 | 2" | 1 3/16" | 1 3/4" | Double Bulb | Zinc-Plated Steel | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 9" | 4 | 9" | 8 | 2" | 1 3/8" | 1 9/16" | Double Bulb | Zinc-Plated Steel | 3/4" | 0000000 | 000000 | 0000000 | 000000 |
| 10" | 5 | 9" | 8 | 2" | 1 3/8" | 1 9/16" | Double Bulb | Zinc-Plated Steel | 7/8" | 0000000 | 000000 | 0000000 | 000000 |
| 11" | 6 | 9" | 8 | 2" | 1 3/8" | 1 9/16" | Double Bulb | Zinc-Plated Steel | 7/8" | 0000000 | 000000 | 0000000 | 000000 |
| 13 1/2" | 8 | 13" | 8 | 2 3/8" | 1 3/8" | 1 3/8" | Double Bulb | Zinc-Plated Steel | 7/8" | 0000000 | 000000 | 0000000 | 000000 |
| 16" | 10 | 13" | 12 | 2 3/8" | 1 3/8" | 1 3/8" | Double Bulb | Zinc-Plated Steel | 1" | 0000000 | 000000 | 0000000 | 000000 |
| 19" | 12 | 13" | 12 | 2 3/8" | 1 3/8" | 1 3/8" | Double Bulb | Zinc-Plated Steel | 1" | 0000000 | 000000 | 0000000 | 000000 |
Expansion Joint Reducers with Flanged Ends
Connect different pipe sizes in your line while adding a point of flexibility between them. These expansion joints absorb movement between two connected pipes to reduce stress, vibration, and noise. Their flanged ends mate with same-size Class 150 flanges without the need for a gasket. Each flange is supported by a zinc-plated steel plate. The body of these expansion joints is reinforced with cord for added strength.
Your pipe system must be rigidly anchored on both sides of the expansion joint to control expansion or contraction of the line. When proper anchoring cannot be provided, limit rods (sold separately) are required.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Alcohol, Calcium Chloride, Coolant, Grain Alcohol, Grease, Hydraulic Fluid, Sodium Carbonate (20% in Water), Water
- Temperature Range: -20° to 250° F
- Maximum Pressure: See Table
- Maximum Vacuum: 26 in. of Hg @ 72° F
Unthreaded Bolt Holes | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Flange OD | Pipe Size | No. of Bolt Holes | Distance | Bolt Hole Size | ||||||||||||
(A) | (B) | (A) | (B) | Lg. | (A) | (B) | Compression | Expansion | Offset | Max. Pressure | Expansion Joint Type | Flange Material | (A) | (B) | Each | |
EPDM Rubber | ||||||||||||||||
| 6" | 4 1/4" | 2 | 1 | 8" | 4 | 4 | 1" | 1/2" | 1/2" | 200 psi @ 72° F | Single Bulb | EPDM Rubber | 3/4" | 5/8" | 0000000 | 0000000 |
| 6" | 5" | 2 | 1 1/2 | 8" | 4 | 4 | 1" | 1/2" | 1/2" | 200 psi @ 72° F | Single Bulb | EPDM Rubber | 3/4" | 5/8" | 0000000 | 000000 |
| 7 1/2" | 6" | 3 | 2 | 8" | 4 | 4 | 1 3/8" | 11/16" | 1/2" | 200 psi @ 72° F | Single Bulb | EPDM Rubber | 3/4" | 3/4" | 0000000 | 000000 |
| 9" | 6" | 4 | 2 | 8" | 8 | 4 | 1 3/8" | 11/16" | 1/2" | 200 psi @ 72° F | Single Bulb | EPDM Rubber | 3/4" | 3/4" | 0000000 | 000000 |
| 9" | 7 1/2" | 4 | 3 | 8" | 8 | 4 | 1 3/8" | 11/16" | 1/2" | 200 psi @ 72° F | Single Bulb | EPDM Rubber | 3/4" | 3/4" | 0000000 | 000000 |
| 11" | 9" | 6 | 4 | 8" | 8 | 8 | 1 9/16" | 3/4" | 1/2" | 190 psi @ 72° F | Single Bulb | EPDM Rubber | 7/8" | 3/4" | 0000000 | 00000000 |
| 13 1/2" | 11" | 8 | 6 | 8" | 8 | 8 | 1 9/16" | 3/4" | 1/2" | 190 psi @ 72° F | Single Bulb | EPDM Rubber | 7/8" | 7/8" | 0000000 | 00000000 |
For Pipe Size | |||||
|---|---|---|---|---|---|
| (A) | (B) | Rod Lg. | Includes | Pkg. | |
| 2 | 1 | 14" | Four Limit Rod Plates, Two Limit Rods with Nuts | 00000000 | 0000000 |
| 2 | 1 1/2 | 14" | Four Limit Rod Plates, Two Limit Rods with Nuts | 00000000 | 000000 |
| 3 | 2 | 14" | Four Limit Rod Plates, Two Limit Rods with Nuts | 00000000 | 000000 |
| 4 | 2 | 14" | Four Limit Rod Plates, Two Limit Rods with Nuts | 00000000 | 000000 |
| 4 | 3 | 14" | Four Limit Rod Plates, Two Limit Rods with Nuts | 00000000 | 000000 |
| 6 | 4 | 14" | Four Limit Rod Plates, Two Limit Rods with Nuts | 00000000 | 000000 |
| 8 | 6 | 17" | Four Limit Rod Plates, Two Limit Rods with Nuts | 00000000 | 000000 |