Restraint Stainless Steel Pipe Coupling

Restraint Stainless Steel Pipe Coupling is a type of pipe coupling that’s designed to join two pipes together securely, while also providing axial restraint to prevent pipe movement under pressure or external forces. Unlike standard stainless steel couplings that rely on sealing elements like rubber gaskets for a watertight connection, restraint couplings incorporate gripping or locking mechanisms—such as wedges, teeth, or set screws—to prevent pipe pullout.

Feature

With tooth shape grip ring to grip pipes to be pulled out
Excellent sealing performance and strong resistance to pullout
Applicable pipes shipbuilding, water supply, wastewater treatment plants, and industrial pipelines.
Ensures safe and quick installation for both suction and pressurized pipelines.
The applicable pipe outer diameter range is 26.9mm to 609.6mm.

Drawing

Material

Item Part Name Material

1 Housing AISI 304, AISI 316L, AISI 316Ti

2 Sealing Gasket EPDM， NBR， MVQ， FPM/FKM

3 Bolts AISI 304, AISI 316L, AISI 316L, AISI 304, AISI 304

4 Toothed Ring AISI 301, AISI 301, AISI 301, AISI 301, AISI 301

5 Steel Clips (Optional) AISI 301, AISI 301, AISI 301, AISI 301, AISI 301, AISI 316L

6 Pins AISI 304, AISI 316L, AISI 304, AISI 304

Dimension

Pipe Outer Diameter Applicable Pipe Outer Diameter Range Working Pressure Coupling Outside Diameter Coupling Width Distance Between Sealing Lips Pipe End Gap Torque Bolts

O.D. Min-Max Static Sealing Pressure Dynamic Sealing Pressure ¢D B C Without Steel Clips With Steel Clips

(mm) (In.) (mm) (bar) (bar) (mm) (mm) (mm) (mm) Max(mm) (Nm) M

21.3 0.838 20-22 18 46 39 61 26 5-8 10 8 M6×2

26.9 1.059 26-28 18 46 43 61 26 5-8 10 8

30 1.181 29-31 18 46 46 61 26 5-8 10 8

33.7 1.327 32-35 18 40 50 61 26 5-8 10 8

38 1.496 37-39 18 35 57 61 26 5-8 10 15 M8×2

42.4 1.669 41-43 18 32 61.3 61 26 5-8 10 15

44.5 1.752 44-46 18 32 63.4 61 26 5-8 10 15

48.3 1.902 47-49 18 32 67.2 61 26 5-8 10 15

54 2.126 53-55 18 32 73 76 37 5-10 15 10

57 2.244 56-58 18 32 76 76 37 5-10 15 10

60.3 2.374 59-61 18 32 79.2 76 37 5-10 15 10

66.6 2.622 64-68 18 32 88.7 95 37 5-10 25 20 M8×2

70 2.756 68-71 18 32 92 95 41 5-10 25 20

73 2.874 72-74 18 32 95 95 41 5-10 25 20

76.1 2.996 75-77 18 32 98.2 95 41 5-10 25 20

79.5 3.13 78-81 18 32 101.6 95 41 5-10 25 20

84 3.307 83-85 18 32 106 95 41 5-10 25 20

88.9 3.5 87-91 18 32 111 95 41 5-10 25 20

100.6 3.961 99-102 16 32 123 95 41 5-10 25 25

101.6 4 100-103 16 32 123.7 95 41 5-10 25 25

104 4.094 103-105 16 32 126 95 41 5-10 25 25

108 4.252 106-109 16 32 130 95 41 5-10 25 25

114.3 4.5 113-116 16 32 136.4 95 41 5-10 25 25

127 5 126-128 16 25 151 110 54 5-10 35 40 M10×2

129 5.079 128-130 16 25 153 110 54 5-15 35 40

130.2 5.126 129-132 16 25 154.3 110 54 5-15 35 40

133 5.236 131-135 16 25 157 110 54 5-15 35 40

139.7 5.5 138-142 16 25 163.8 110 54 5-15 35 40

141.3 5.563 140-143 16 25 165.4 110 54 5-15 35 40

154 6.063 153-156 16 25 176.4 110 54 5-15 35 40

159 6.26 158-161 16 25 183 110 54 5-15 35 40

168.3 6.626 167-170 16 25 189 110 54 5-15 35 40

193.7 7.626 192-196 10 22 215 142 80 15-20 40 60 M12X2

200 7.874 198-202 10 22 222 142 80 15-20 40 60

204 8.031 202-206 10 22 224 142 80 15-20 40 60

206 8.11 204-208 10 22 234 142 80 15-20 40 60

219.1 8.626 216-222 10 22 250 142 80 15-20 40 60

244.5 9.626 242-247 10 20 275 142 80 15-20 40 60

250 9.843 247-253 10 20 279 142 80 15-20 40 60

254 10 251-257 10 20 282 142 80 15-20 40 60

256 10.079 253-259 10 20 284 142 80 15-20 40 60

267 10.512 264-270 10 20 297 142 80 15-20 40 60

273 10.748 270-276 10 20 303 142 80 15-20 40 60

Stainless steel pipe couplings used in the maritime and shipbuilding industry are tested at 4 times the working pressure.
Stainless steel pipe couplings used in the industrial and land-based sectors are tested at 1.5 times the working pressure.

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