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Proco Style 240

Proco Style 240 molded single-sphere rubber expansion joints are built to withstand even the most rigorous piping system configurations. They allow for axial compression or axial extension, and lateral deflection as well as angular movement. Their easy installation makes them the logical choice for even the toughest jobs.

Some of the notable features and benefits of the Proco Style 240 are:

  • Absorption of Directional Movement
  • Easy Installation with Rotating Metallic Flanges
  • Wide Range of Flange Materials Available
  • Absorption of Vibration, Noise and Shock
  • Wide Range of Service and Lighter Weight
  • Easy Material Identification

For more information about the features and benefits of the Proco Style 240, download our brochure.

For up-to-date pricing and availability information, contact Proco today.

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proco series 240 UPDATED

Notes:

All Products are reinforced with Nylon Tire Cord, except 240-A and 240-C which are reinforced with Polyester.
1.  All NN & NP elastomer designated joints meet the Coast Guard Requirements and conform to ASTM F 1123-87 and are marked accordingly.
2.  Branding Label will be marked as “Food Grade”.
3.  BB, EE, or EE-9 are good for 300°F blower service at 20 PSI or less.
4.  240-A & 240-C expansion joints have black EPDM tube, but are FDA compliant.
5.  EE-9 joints are peroxide cured.
6.  NP-9 joints have ABS certification.
7.  Elastomers are in accordance with NSF/ANSI 372, File MH47689 Und. Lab. Classified.
8.  All elastomers above are not intended for steam service.
9.  For PTFE lined single sphere see www.www.procoproducts.com/ptfelined.html
10.  For 240A & 240C Rubber Joints, Vacuum Support devices are available.  Published movements will be reduced by approximately 50% for this option.
11.  Series 240AV,D,E&M + 242A,B&C In Elastomers EPDM & Neoprene are all listed for lead content in accordance with NSF/ANSI 372

  

Nominal Pipe Size I.D.

Neutral Length

PROCO Style Number1

240 Movement Capability: From Neutral Position (Non-Concurrent)2

Pressure4

Standard Flange Drilling Dimensions8

Weight in lbs.

Axial Compression Inches

Axial Extension Inches

Lateral deflection Inches

Angular Deflection Degrees

Thrust Factor3

Positive PSIG5

Vacuum6
Inches of Hg

Flange O.D. Inches

Bolt Circle Inches

Number of Holes

Size of Holes
Inches

Bolt Hole Thread

Exp. Joint & Flanges

Control Unit Set (2 Rod)

1
(25)

5.00
6.00

240-C
240-AV

1.063
0.500

1.250
0.375

1.188
0.500

45
37

4.43

225

26

4.25

3.13

4

0.625

1/2-13 UNC

3.8

3.3

1.25
(32)

3.74
5.00
5.00
6.00

240-D
240-C
240-E
240-AV

0.312
1.063
0.500
0.500

0.188
1.250
0.375
0.375

0.312
1.188
0.500
0.500

45
17
31
31

6.34

225
235
225
225

26
21
26
26

4.63

3.5

4

0.625
0.625
0.625
0.625




1/2-13 UNC

4.6
5.0
5.0
5.0

3.3

1.5
(40)

3.74
4.00
5.00
5.00
6.00

240-D
240-M
240-C
240-E
240-AV

0.375
0.375
1.063
0.500
0.500

0.188
0.188
1.250
0.375
0.375

0.312
0.312
1.188
0.500
0.500

14
14
45
27
27

6.49

225
225
235
225
225

26
26
18
26
26

5.0

3.88

4

0.625
0.625
0.625
0.625
0.625





1/2-13 UNC

5.4
5.5
5.1
6.0
6.1

4.6

2
(50)

4.00
4.13
5.00
5.00
6.00
6.00
6.00

240-M
240-D
240-C
240-E
240-A
240-AV
Q-240-HW

0.375
0.375
1.063
0.375
1.188
0.500
0.500

0.188
0.188
1.250
0.375
1.188
0.375
0.375

0.312
0.312
1.188
0.500
1.188
0.500
0.500

11
11
45
20
45
20
20

7.07

225
225
235
225
235
225
300

26
26
18
26
18
26
26

6.0
6.0
6.0
6.0
6.0
6.0
6.5

4.75
4.75
4.75
4.75
4.75
4.75
5.0

4
4
4
4
4
4
8

0.750
0.750
0.750
0.750
0.750
0.750
0.750






5/8-11 UNC

8.3
8.5
7.1
8.5
7.1
12.3
11.0

6.3
6.3
6.3
6.3
6.3
7.6
7.6

2.5
(65)

4.0
4.53
5.00
5.00
6.00
6.00

240-M
240-D
240-C
240-E
240-A
240-AV

0.375
0.500
1.063
0.500
1.188
0.500

0.188
0.188
1.250
0.375
1.188
0.375

0.375
0.375
1.188
0.500
1.188
0.500

8
11
45
17
43
17

11.05

225
225
235
225
235
225

26
26
18
26
18
26

7.0

5.5

4

0.750
0.750
0.750
0.750
0.750
0.750






5/8-11 UNC

12.0
12.3
10.6
12.0
12.0
12.3

7.6

3
(80)

5.00
5.00
5.12
6.00
6.00
8.00
6.00

240-C
240-E
240-D
240-A
240-AV
240-AV
Q-240-HW

1.063
0.500
0.500
 1.188
0.500
0.500
0.500

1.250
0.375
0.375
1.188
0.375
0.375
0.375

1.188
0.500
0.500
1.188
0.500
0.500
0.500

40
14
14
38
14
14
14

13.36

235
225
225
235
225
225
300

15
26
26
15
26
26
26

7.5
7.5
7.5
7.5
7.5
7.5
8.25

6.0
6.0
6.0
6.0
6.0
6.0
6.62

4
4
4
4
4
4
8

0.750
0.750
0.750
0.750
0.750
0.750
0.875





5/8-11 UNC
5/8-11 UNC

13.3
14.0
14.0
13.8
14.0
15.0
17.5

8.3
8.3
8.3
8.3
8.3
8.7
8.3

3.5
(90)

6.00

240-AV

0.500

0.375

0.500

12

18.67

225

26

8.5

7.0

8

0.750

5/8-11 UNC

17.6

7.4

4
(100)

5.00
5.00
5.32
6.00
6.00
8.00
6.00

240-C
240-E
240-D
240-A
240-AV
240-AV
Q-240-HW

1.063
0.750
0.750
1.188
0.750
0.750
0.750

1.250
0.500
0.500
1.188
0.500
0.500
0.500

1.188
0.500
0.500
0.500
1.188
0.500
0.500

32
14
14
30
14
14
14

22.69

235
225
225
235
225
225
300

15
26
26
15
26
26
26

9.0
9.0
9.0
9.0
9.0
9.0
10.0

7.5
7.5
7.5
7.5
7.5
7.5
7.88

8
8
8
8
8
8
8

0.750
0.750
0.750
0.750
0.750
.0750
0.750





5/8-11 UNC
5/8-11 UNC

16.5
17.0
17.1
17.5
18.3
19.3
26.0

7.4
7.4
7.4
7.4
7.4
7.8
7.4

5
(125)

5.00
5.00
6.00
6.00
6.69
8.00
6.00

240-C
240-E
240-A
240-AV
240-D

240-AV
Q-240-HW

1.063
0.750
1.188
0.750
0.750
0.750
0.750

1.250
0.500
1.188
0.500
0.500
0.500
0.500

1.188
0.500
1.188
0.500
0.500
0.500
0.500

27
11
25
11
11
11
11

30.02

235
225
235
225
225
225
300

10
26
10
26
10
26
26

10.0
10.0
10.0
10.0
10.0
10.0
11.0

8.5
8.5
8.5
8.5
8.5
8.5
9.25

8
8
8
8
8
8
8

0.875
0.875
0.875
0.875
0.875
0.875
0.875




3/4-10 UNC

3/4-10 UNC

20.3
22.0
21.8
22.8
23.6
25.0
28.0

 8.3
8.3
8.3
8.3
8.5
10.8
14.0

6
(150)

5.00
5.00
6.00
6.00
7.09
8.00
6.00

240-C
240-E
240-A
240-AV
240-D

240-AV
Q-240-HW

1.063
0.750
1.188
0.750
0.750
0.750
0.750

1.250
0.500
1.188
0.500
0.500
0.500
0.500

1.188
0.500
1.188
0.500
0.500
0.500
0.500

23
9
21
9
9
9
9

41.28

225
225
235
225
225
225
300

8
26
10
26
26
26
26

11.0
11.0
11.0
11.0
11.0
11.0
12.5

9.5
9.5
9.5
9.5
9.5
9.5
10.62

8
8
8
8
8
8
12

0.875
0.875
0.875
0.875
0.875
0.875
0.875




3/4-10 UNC

3/4-10 UNC

22.6
26.0
24.0
26.8
29.0
29.1
39.0

10.4
10.4
10.4
10.4
10.6
10.8
10.4

8
(200)

5.00
5.00
6.00
6.00
8.07
6.00

240-C
240-E
240-A
240-AV
240-D

Q-240-HW

1.063
0.750
1.188
0.750
1.000
0.750

1.188
0.500
1.188
0.500
0.563
0.500

1.188
0.500
1.188
0.500
0.875
0.500

17
7
16
7
8
7

63.62

235
225
235
225
225
300

8
26
8
26
26
26

13.5
13.5
13.5
13.5
13.5
15.0

11.75
11.75
11.75
11.75
11.75
13.0

8
8
8
8
8
12

0.875
0.875
0.875
0.875
0.875
1.000




3/4-10 UNC

35.5
40.0
38.5
40.6
41.3
70.0

13.4
13.4
13.4
13.4
14.0
13.4

10
(250)

5.00
5.00
8.00
8.00
9.00
9.45
10.00
8.00

240-C
240-E
240-A
240-AV
240-AV
240-D

240-AV
Q-240-HW

1.063
1.000
1.188
1.000
1.000
1.000
1.000
1.000

1.188
0.625
1.188
0.625
0.625
0.625
0.625
0.625

1.188
0.750
1.188
0.750
0.750
0.750
0.875
0.750

14
7
13
7
7
7
7
7

103.87

235
225
145
225
225
225
225
275

6
26
6
26
26
26
26
26

16.0
16.0
16.0
16.0
16.0
16.0
16.0
17.5

14.25
14.25
14.25
14.25
14.25
14.25
14.25
15.25

12
12
12
12
12
12
12
16

1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.125




7/8-9 UNC
7/8-9 UNC

7/8-9 UNC

49.3
56.0
53.6
56.6
57.0
58.5
60.5
56.0

21.0
21.0
21.3
21.3
22.0
22.0
26.5
22.0

12
(300)

5.00
5.00
8.00
8.00
9.00
10.24
8.00

240-C
240-E
240-A
240-AV
240-AV

240-D
Q-240-HW

1.063
1.000
1.188
1.000
1.000
1.000
1.000

1.250
0.625
1.188
0.625
0.625
0.625
0.625

1.188
0.750
1.188
0.750
0.750
0.750
0.750

12
6
11
6
6
6
6

137.89

235
225
145
225
225
225
275

6
26
6
26
26
26
26

19.0
19.0
19.0
19.0
19.0
19.0
20.5

17.0
17.0
17.0
17.0
17.0
17.0
17.75

12
12
12
12
12
12
16

1.000
1.000
1.000
1.000
1.000
1.000
1.250




7/8-9 UNC
7/8-9 UNC

73.4
74.0
80.0
83.0
88.0
89.0
100.0

26.5
26.5
27.0
27.0
27.0
28.0
27.0

14
(350)

8.00
8.00

240-C
240-AV

1.000
1.000

1.063
0.625

1.188
0.750

8
6

182.65

232
150

6
26

21.0

18.75

12

1.125
1.125


112.0
115.0

28.0
28.0

16
(400)

8.00
8.00
8.00
9.00
10.43

240-C
240-HW
240-AV
240-M

240-D

1.000
1.000
1.000
1.000
1.000

1.063
0.625
0.625
0.625
0.625

1.118
0.750
0.750
0.750
0.750

8
4
4
4
4

240.53

232
175
125
125
125

6
26
26
26
26

23.5

21.25

16

1.125
1.125
1.125
1.125
1.125





136.0
186.0
165.0
168.0
170.0

26.8
26.8
26.8
27.0
27.0

18
(450)

8.00
8.00
9.00
10.43

240-HW
240-AV
240-M
240-D

1.000
1.000
1.000
1.000

0.625
0.625
0.625
0.625

0.750
0.750
0.750
0.875

4

298.65

175
125
125
125

26
26
26
26

25.0

22.75

16

1.250
1.250
1.250
1.250




209.0
168.0
169.0
170.0

31.4
31.4
33.1
33.1

20
(500)

8.00
8.00
8.00
9.00
10.43

240-C
240-HW
240-AV
240-M
240-D

1.000
1.000
1.000
1.000
1.000

1.063
0.625
0.625
0.625
0.625

1.118
0.750
0.750
0.750
0.750

6
3
3
3
3

363.05

145
175
125
125
125

6
26
26
26
26

27.5

25.0

20

1.250
1.250
1.250
1.250
1.250





154.0
234.0
170.0
173.0
175.0

32.4
32.4
32.4
32.4
34.1

24
(600)

8.00
10.00
10.00
10.00

240-C
240-AV
240-HW
240-D

1.000
1.000
1.000
1.000

1.063
0.625
0.625
0.625

1.118
0.750
0.750
0.875

5
3
3
3

510.70

145
110
160
110

6
26
26
26

32.5

29.5

20

1.375
1.375
1.375
1.375




214.0
255.0
297.0
265.0

44.0
45.5
45.5
46.0

30
(750)

10.00

240-AV

1.000

0.625

0.750

2

779.31

110

26

38.75

36.0

28

1.375

295.0

57.0

NOTES:
Standard Proco Style 240-AV Expansion Joints shown in Bold Type are considered Standards and are inventoried in large quantities.
1. “HW” denotes Heavy Weight Construction. For sizes 2” I.D. thru 12” I.D., Proco will only offer these items with 300 lb. drilling and are denoted by Q-242-HW. 
All Q-240-HW units will only be sold with control units.
2. Concurrent Movements – Concurrent movements are developed when two or more movements in a pipe system occur at the same time. If multiple movements exceed single arch design there may be a need for an additional arch.
To perform calculation for concurrent movement when a pipe system design has more than one movement, please use the following formula:
formulaCalculation must be equal to or less than 1 for expansion joint to operate within concurrent movement capability.
3. Calculation of Thrust (Thrust Factor). When expansion joints are installed in the pipeline, the static portion of

the thrust is calculated as a product of the area of the I.D. of the arch of the expansion joint times the maximum
pressure (design, test or surge) that will occur in the line. The result is a force expressed in pounds. Take design, surge or test pressure X thrust factor to calculate end thrust.
4. Pressure rating is based on  1700 F operating temperature. The pressure rating is reduced at higher temperatures.
5. Pressures shown at maximum “operating pressure”. Test pressure is 1.5 times “operating pressure”. Burst pressure is 4 times “operating pressure”. If factory hydro-test is required, an additional joint per size must be purchased and tested. Once hydro-tested this joint may not be sent to field for installation as the beaded end will have taken a (compressed) set and can not be reused.
6. Vacuum rating is based on neutral installed length, without external load. Products should not be installed in extension for vacuum applications. Flattening of the arch in extended mode will cause the arch to collapse.

7. Style 242A/NN (neoprene elastomer only) expansion joints 1.0” I.D. thru 12” I.D. are available with tapped (threaded) holes and must be specified at time of order.
8. In addition to standard 150 lb. drilled flanges, Proco can provide expansion joints listed above in 300 lb. drilling, BS-10 (British) drilling, Metric PN10 and PN16 drilling and JIS 10kg/cm drilling.
9. For PTFE lined single sphere see www.www.procoproducts.com/ptfelined.html

NOMINAL Pipe Size
Inch/(mm)

American 125/150#
Conforms to ANSI B16.1 and B16.5

American 250/300#
Conforms to ANSI B16.1 and B16.5

British Standard 10:1962
Conforms to BS 10 Table E

Flange ThicknessFlange O.D.Bolt CircleNo. of HolesDrilled Hole SizeThreaded Hole SizeFlange ThicknessFlange O.DBolt CircleNo. of HolesHole SizeFlange ThicknessFlange O.D.Bolt CircleNo. of HolesHole Size

1
(25)

0.55
(14.0)

4.25
(108.0)

3.13
(79.4)

4

0.62
(15.9)

1/2-13 UNC

0.63
(16.0)

4.88
(124.0)

3.5
(88.9)

4

0.75
(19.1)

0.59
(15.0)

4.5
(114.0)

3.25
(82.6)

4

0.62
(15.9)

1.25
(32)

0.55
(14.0)

4.63
(118.0)

3.5
(88.9)

4

0.62
(15.9)

1/2-13 UNC

0.63
(16.0)

5.25
(133.0)

3.88
(98.4)

4

0.75
(19.1)

0.59
(15.0)

4.75
(121.0)

3.44
(87.3)

4

0.62
(15.9)

1.5
(40)

0.55
(14.0)

5.0
(127.0)

3.88
(98.4)

4

0.62
(15.9)

1/2-13 UNC

0.63
(16.0)

6.12
(156.0)

4.50
(114.3)

4

0.88
(22.2)

0.59
(15.0)

5.25
(133.0)

3.88
(98.4)

4

0.62
(15.9)

2
(50)

0.63
(16.0)

6.0
(152.0)

4.75
(120.7)

4

0.75
(19.1)

5/8-11 UNC

0.71
(18.0)

6.50
(165.0)

5.00
(127.0)

8

0.75
(19.1)

0.63
(16.0)

6.0
(152.0)

4.5
(114.3)

4

0.75
(19.1)

2.5
(65)

0.71
(18.0)

7.0
(178.0)

5.5
(139.7)

4

0.75
(19.1)

5/8-11 UNC

0.71
(18.0)

7.5
(191.0)

5.88
(149.2)

8

0.88
(22.2)

0.71
(18.0)

6.5
(165.0)

5.0
(127.0)

4

0.75
(19.1)

3
(80)

0.71
(18.0)

7.5
(191.0)

6.0
(152.4)

4

0.75
(19.1)

5/8-11 UNC

0.79
(20.0)

8.25
(210.0)

6.62
(168.2)

8

0.88
(22.2)

0.71
(18.0)

7.25
(184.0)

5.75
(146.1)

4

0.75
(19.1)

3.5
(90)

0.71
(18.0)

8.5
(216.0)

7.0
(177.8)

8

0.75
(19.1)

5/8-11 UNC

0.79
(20.0)

9.0
(229.0)

7.25
(184.2)

8

0.88
(22.2)

0.71
(18.0)

8.0
(203.0)

6.5
(165.1)

8

0.75
(19.1)

4
(100)

0.71
(18.0)

9.0
(229.0)

7.5
(190.5)

8

0.75
(19.1)

5/8-11 UNC

0.79
(20.0)

10.0
(254.0)

7.88
(200.0)

8

0.88
(22.2)

0.71
(18.0)

8.5
(216.0)

7.0
(177.8)

8

0.75
(19.1)

5
(125)

0.79
(20.0)

10.0
(254.0)

8.5
(215.9)

8

0.88
(22.2)

3/4-10 UNC

0.87
(22.0)

11.0
(279.0)

9.25
(235.0)

8

0.88
(22.2)

0.79
(20.0)

10.0
(254.0)

8.25
(209.6)

8

0.75
(19.1)

6
(150)

0.87
(22.0)

11.0
(279.0)

9.5
(241.3)

8

0.88
(22.2)

3/4-10 UNC

0.87
(22.0)

12.5
(318.0)

10.62
(269.9)

12

0.88
(22.2)

0.87
(22.2)

11.0
(279.0)

9.25
(235.0)

8

0.88
(22.2)

8
(200)

0.87
(22.0)

13.5
(343.0)

11.75
(298.5)

8

0.88
(22.2)

3/4-10 UNC

0.95
(24.0)

15.0
(381.0)

13.0
(330.2)

12

1.00
(25.4)

0.87
(22.2)

13.25
(337.0)

11.5
(292.1)

8

0.88
(22.2)

10
(250)

0.95
(24.0)

16.0
(406.0)

14.25
(362.0)

12

1.00
(25.4)

7/8-9 UNC

1.02
(26.0)

17.5
(445.0)

15.25
(387.4)

16

1.13
(28.6)

0.95
(24.0)

16.0
(406.0)

14.0
(355.6)

12

0.88
(22.2)

12
(300)

0.95
(24.0)

19.0
(483.0)

17.0
(431.8)

12

1.00
(25.4)

7/8-9 UNC

1.02
(26.0)

20.5
(521.0)

17.75
(450.9)

16

1.25
(31.8)

0.95
(24.0)

18.0
(457.0)

16.0
(406.4)

12

1.00
(25.4)

14
(350)

1.02
(26.0)

21.0
(533.0)

18.75
(476.3)

12

1.13
(28.6)

1-8 UNC

1.10
(28.0)

23.0
(584.0)

20.25
(514.4)

20

1.25
(31.8)

1.02
(26.0)

20.75
(527.0)

18.5
(469.9)

12

1.00
(25.4)

16
(400)

1.10
(28.0)

23.5
(597.0)

21.25
(539.8)

16

1.13
(28.6)

1-8 UNC

1.18
(30.0)

25.5
(648.0)

22.5
(571.5)

20

1.38
(34.9)

1.10
(28.0)

22.75
(578.0)

20.5
(520.7)

12

1.00
(25.4)

18
(450)

1.18
(30.0)

25.0
(635.0)

22.75
(577.9)

16

1.25
(31.8)

1 1/8-7 UNC

1.18
(30.0)

28.0
(711.0)

24.75
(628.7)

24

1.38
(34.9)

1.18
(30.0)

25.25
(641.0)

23.0
(584.2)

16

1.00
(25.4)

20
(500)

1.18
(30.0)

27.5
(699.0)

25.0
(635.0)

20

1.25
(31.8)

1 1/8-7 UNC

1.18
(30.0)

30.5
(775.0)

27.0
(685.8)

24

1.38
(34.9)

1.18
(30.0)

27.75
(705.0)

25.25
(642.4)

16

1.00
(25.4)

24
(600)

1.18
(30.0)

32.06
(813.0)

29.5
(749.3)

20

1.38
(34.9)

1 1/4-7 UNC

1.18
(30.0)

36.0
(914.0)

32.0
(812.8)

24

1.62
(41.3)

1.18
(30.0)

32.5
(826.0)

29.75
(755.7)

16

1.25
(31.8)

30
(750)

1.26
(32.0)

38.75
(984.0)

36.0
(914.4)

28

1.38
(34.9)

1 1/4-7 UNC

1.26
(32.0)

43.0
(1092.0)

39.25
(997.0)

28

2.00
(50.8)

1.26
(32.0)

39.25
(997.0)

36.5
(927.1)

20

1.38
(34.9)

 

NOMINAL Pipe Size
Inch/(mm)

Metric Series
Conforms to I.S.O. 2084-1974 Table PN10
Holes to I.S.O. /R-273

Metric Series
Conforms to I.S.O. 2084-1974 Table PN16
Holes to I.S.O. /R-273

J.I.S. Standard B-2212
Conforms to J.I.S. 10Kg/cm

Flange ThicknessFlange O.D.Bolt CircleNo. of HolesHole SizeFlange ThicknessFlange O.D.Bolt CircleNo. of HolesHole SizeFlange ThicknessFlange O.D.Bolt CircleNo. of HolesHole Size

1
(25)

0.63
(16.0)

4.53
(115.0)

3.35
(85.0)

4

0.55
(14.0)

0.63
(16.0)

4.53
(115.0)

3.35
(85.0)

4

0.55
(14.0)

0.59
(15.0)

4.92
(125.0)

3.54
(90.0)

4

0.75
(19.0)

1.25
(32)

0.63
(16.0)

5.51
(140.0)

3.94
(85.0)

4

0.71
(18.0)

0.63
(16.0)

5.51
(140.0)

3.94
(100.0)

4

0.71
(18.0)

0.59
(15.0)

5.31
(135.0)

3.94
(100.0)

4

0.75
(19.0)

1.5
(40)

0.63
(16.0)

5.91
(150.0)

4.33
(110.0)

4

0.71
(18.0)

0.63
(16.0)

5.91
(150.0)

4.33
(110.0)

4

0.71
(18.0)

0.59
(15.0)

5.51
(140.0)

4.13
(105.0)

4

0.75
(19.0)

2
(50)

0.71
(18.0)

6.50
(165.0)

4.92
(125.0)

4

0.71
(18.0)

0.71
(18.0)

6.50
(165.0)

4.92
(125.0)

4

0.71
(18.0)

0.63
(16.0)

6.10
(155.0)

4.72
(120.0)

4

0.75
(19.0)

2.5
(65)

0.71
(18.0)

7.28
(185.0)

5.71
(145.0)

4

0.71
(18.0)

0.71
(18.0)

7.28
(185.0)

5.71
(145.0)

4

0.71
(18.0)

0.71
(18.0)

6.89
(175.0)

5.51
(140.0)

4

0.75
(19.0)

3
(80)

0.79
(20.0)

7.87
(200.0)

6.3
(160.0)

8

0.71
(18.0)

0.79
(20.0)

7.87
(200.0)

6.30
(160.0)

8

0.71
(18.0)

0.71
(18.0)

7.28
(185.0)

5.91
(150.0)

8

0.75
(19.0)

3.5
(90)











0.71
(18.0)

7.68
(195.0)

6.30
(160.0)

8

0.75
(19.0)

4
(100)

0.79
(20.0)

8.66
(220.0)

7.09
(180.0)

8

0.71
(18.0)

0.79
(20.0)

8.66
(220.0)

7.09
(180.0)

8

0.71
(18.0)

0.71
(18.0)

8.27
(210.0)

6.89
(175.0)

8

0.75
(19.0)

5
(125)

0.87
(22.0)

9.84
(250.0)

8.27
(210.0)

8

0.71
(18.0)

0.87
(22.0)

9.84
(250.0)

8.27
(210.0)

8

0.71
(18.0)

0.79
(20.0)

9.84
(250.0)

8.27
(210.0)

8

0.91
(23.0)

6
(150)

0.87
(22.0)

11.22
(285.0)

9.45
(240.0)

8

0.87
(22.0)

0.87
(22.0)

11.22
(285.0)

9.45
(240.0)

8

0.87
(22.0)

0.87
(22.0)

11.02
(280.0)

9.45
(240.0)

8

0.91
(23.0)

8
(200)

0.87
(22.0)

13.39
(340.0)

11.61
(295.0)

8

0.87
(22.0)

0.87
(22.0)

13.39
(340.0)

11.61
(295.0)

12

0.87
(22.0)

0.87
(22.0)

12.99
(330.0)

11.42
(290.0)

12

0.91
(23.0)

10
(250)

1.02
(26.0)

15.55
(395.0)

13.78
(350.0)

12

0.87
(22.0)

1.02
(26.0)

15.94
(405.0)

13.98
(355.0)

12

1.02
(26.0)

0.95
(24.0)

15.75
(400.0)

13.98
(355.0)

12

0.98
(25.0)

12
(300)

1.02
(26.0)

17.52
(445.0)

15.75
(400.0)

12

0.87
(22.0)

1.02
(26.0)

18.11
(460.0)

16.14
(410.0)

12

1.02
(26.0)

0.95
(24.0)

17.52
(445.0)

15.75
(400.0)

16

0.98
(25.0)

14
(350)

1.10
(28.0)

19.88
(505.0)

18.11
(460.0)

16

0.87
(22.0)

1.10
(28.0)

20.47
(520.0)

18.50
(470.0)

16

1.02
(26.0)

1.02
(26.0)

19.29
(490.0)

17.52
(445.0)

16

0.98
(25.0)

16
(400)

1.18
(30.0)

22.24
(565.0)

20.28
(515.0)

16

1.02
(26.0)

1.18
(30.0)

22.83
(580.0)

20.67
(525.0)

16

1.18
(30.0)

1.10
(28.0)

22.05
(560.0)

20.08
(510.0)

16

1.06
(27.0)

18
(450)

1.18
(30.0)

24.21
(615.0)

22.24
(565.0)

20

1.02
(26.0)

1.18
(30.0)

25.20
(640.0)

23.03
(585.0)

20

1.18
(30.0)

1.18
(30.0)

24.41
(620.0)

22.24
(565.0)

20

1.06
(27.0)

20
(500)

1.18
(30.0)

26.38
(670.0)

24.41
(620.0)

20

1.02
(26.0)

1.18
(30.0)

28.15
(715.0)

25.59
(650.0)

20

1.30
(33.0)

1.18
(30.0)

26.57
(675.0)

24.41
(620.0)

20

1.06
(27.0)

24
(600)

1.18
(30.0)

30.71
(780.0)

28.54
(725.0)

20

1.18
(30.0)

1.18
(30.0)

33.07
(840.0)

30.71
(770.0)

20

1.42
(36.0)

1.18
(30.0)

31.30
(795.0)

28.74
(730.0)

24

1.30
(33.0)

30
(750)

1.26
(32.0)

37.99
(965.0)

35.43
(900.0)

24

1.30
(33.0)

1.26
(32.0)

38.19
(970.0)

35.43
(900.0)

24

1.42
(36.0)

1.26
(32.0)

38.19
(970.0)

35.07
(900.0)

24

1.30
(33.0)

Table 5:Standard Drilling for PROCO Rubber Expansion JointsThickness of Materials for PROCO Rubber Expansion JointsControl Unite Plate Detail

Nominal Pipe Size Expansion Joint I.D.
Inch/(mm)

Flange Dimensions2Material Thickness1 for Bolt Length Requirements

Flange O.D.
Inch/(mm)

Bolt Circle
Inch / (mm)

Number of Holes

Size of Holes
Inch/(mm)

Bolt Hole Thread

Nominal Flange/ Beaded End Thickness
Inch/(mm) (Approx. Value)

Adjacent Mating 3 Flange Thickness

Max. Control4
Rod Plate Thickness

Inch/(mm)

Control Rod6
Plate O.D.

Inch/(mm)

Maximum7 Rod Diameter
Inch/(mm)

1
(25)

4.25
(108.0)

3.13
(79.50)

4

0.625
(15.87)

1/2-13 UNC

1.25
(31.75)

Customer to specify mating flange thickness

0.375
(9.53)

8.375
(215.9)

0.625
(15.9)

1.25
(32)

4.63
(118.0)

3.5
(88.90)

4

0.625
(15.87)

1/2-13 UNC

1.25
(31.75)

0.375
(9.53)

8.750
(222.3)

0.625
(15.9)

1.5
(40)

5.00
(127.0)

3.88
(98.55)

4

0.625
(15.87)

1/2-13 UNC

1.25
(31.75)

0.375
(9.53)

9.125
(231.8)

0.625
(15.9)

2
(50)

6.00
(152.00)

4.75
(120.65)

4

0.750
(19.05)

5/8-11 UNC

1.25
(31.75)

0.375
(9.53)

10.125
(257.2)

0.625
(15.9)

2.5
(65)

7.00
(178.00)

5.50
(139.70)

4

0.750
(19.05)

5/8-11 UNC

1.25
(31.75)

0.375
(9.53)

11.125
(282.6)

0.625
(15.9)

3
(80)

7.50
(191.00)

6.00
(152.40)

4

0.750
(19.05)

5/8-11 UNC

1.25
(31.75)

0.375
(9.53)

11.625
(295.3)

0.625
(15.9)

3.5
(90)

8.5
(216.0)

7.0
(177.80)

8

0.750
(19.05)

5/8-11 UNC

1.25
(31.75)

0.375
(9.53)

12.625
(320.7)

0.625
(15.9)

4
(100)

9.00
(229.00)

7.50
(190.50)

8

0.750
(19.05)

5/8-11 UNC

1.25
(31.75)

0.375
(9.53)

13.125
(333.4)

0.625
(15.9)

5
(125)

10.00
(254.00)

8.50
(215.90)

8

0.875
(22.23)

3/4-10 UNC

1.50
(38.10)

0.500
(12.70)

14.125
(358.8)

0.625
(15.9)

6
(150)

11.00
(279.00)

9.50
(241.30)

8

0.875
(22.23)

3/4-10 UNC

1.50
(38.10)

0.500
(12.70)

15.125
(384.2)

0.625
(15.9)

8
(200)

13.50
(343.00)

11.75
(298.45)

8

0.875
(22.23)

3/4-10 UNC

1.50
(38.10)

0.750
(19.05)

19.125
(485.8)

1.000
(25.4)

10
(250)

16.00
(406.00)

14.25
(361.95)

12

1.000
(25.40)

7/8-9 UNC

1.50
(38.10)

0.750
(19.05)

21.625
(549.3)

1.000
(25.4)

12
(300)

19.00
(483.00)

17.00
(431.80)

12

1.000
(25.40)

7/8-9 UNC

1.50
(38.10)

0.750
(19.05)

24.625
(625.5)

1.000
(25.4)

14
(350)

21.00
(533.00)

18.75
(476.25)

12

1.125
(28.58)

1.75
(44.45)

0.750
(19.05)

26.625
(676.3)

1.000
(25.4)

16
(400)

23.50
(597.00)

21.25
(539.75)

16

1.125
(28.58)

1.75
(44.45)

0.750
(19.05)

30.125
(765.2)

1.250
(31.8)

18
(450)

25.00
(635.00)

22.75
(577.85)

16

1.250
(31.75)

2.00
(50.80)

0.750
(19.05)

31.625
(803.3)

1.250
(31.8)

20
(500)

27.50
(699.00)

25.00
(635.00)

20

1.250
(31.75)

2.00
(50.80)

0.750
(19.05)

34.125
(866.8)

1.250
(31.8)

24
(600)

32.00
(813.00)

29.50
(749.30)

20

1.375
(34.93)

2.00
(50.80)

1.000
(25.40)

38.625
(981.1)

1.250
(31.8)

30
(750)

38.75
(984.00)

36.00
(914.40)

28

1.375
(34.93)

2.00
(50.80)

1.250
(31.75)

46.375
(1177.9)

1.500
(38.1)

Metric Conversion Formula: Nominal I.D.: in. x 25 = mm; Dimensions/Thickness’: in. x 25.4 = mm.

A control rod unit consists of limit rods, tie rods, or compression sleeves, and a control unit assembly is a system of two or more control rod units placed across an expansion joint from flange to flange. Their purpose is to minimize possible damage caused by possible excessive motion of a pipeline. Control unit assemblies can be set at the maximum allowable expansion and / or contraction of the rubber expansion joint.

When used properly, control unit assemblies serve as additional safety enhancements, and can minimize possible damage due to adjacent equipment.

Rubber expansion joints should be installed between two fixed anchor points in a piping system. When proper anchoring can’t be provided, control units are required. When an un-anchored piping system is encountered, nuts should be tightened securely against the rod plate, to prevent over-extension due to pressure thrust caused by the expansion joint.

Listed below are three control unit configurations supplied by Proco, that are commonly used with rubber expansion joints in piping systems.

  • Figure 1: Limit Rod. A limit rod control unit configuration will allow an expansion joint to lengthen to a predetermined extension setting. Spherical washers can also be furnished, upon request, to prevent any “nut to plate” binding during offset.
  • Figure 2: Limit / Control Rod. This type of configuration is used to allow specified pipe expansion (expansion joint axial compression) and pipe contraction (expansion joint axial extension) movements. Spherical washers can also be furnished, upon request, to prevent any “nut to plate” binding during offset.
  • Figure 3: Compression Sleeve. A compression sleeve configuration is used to allow for specified pipe expansion (expansion joint axial compression) and pipe contraction (expansion joint extension) movements. Proco will supply each compression sleeve equipped to prevent any axial movement, unless otherwise specified at the time of purchase. Spherical washers can also be furnished, upon request, to prevent any “nut to plate” binding during offset.

For more information on Proco control unit specifications, download our Style 240 Brochure.

For up-to-date pricing and availability information, contact Proco today.

In order to properly and successfully install a Pr0c0 Style 240 non-metallic expansion joints with beaded end flanges, specific conditions must be met. It’s also important to ensure the process is implemented using the guidelines set forth in our brochure. Contact Proco for additional advice if the system requirements exceed those of the expansion joint selected.

For detailed information on service conditions, proper alignment, anchoring, and storage techniques, download the Proco Style 240 Brochure.