GB/T 11611-1989 Metal pipes, internal and external threaded pipe joints and hose end joints for automobile hydraulic brake systems GB/T11611-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Automobile Hydraulic Braking System
Metal pipes, internal and external thread
Pipe fittings and hose end fittings
Motor vehicles --Hydraulic braking systems-Pipes, tapped holesmale fittings and hose end fittings Subject content and scope of application
GB 11611—89
This standard specifies the basic dimensions, performance and material requirements for metal pipes, internal and external threaded pipe fittings and hose end fittings used in automobile hydraulic braking systems.
This standard applies to vehicles equipped with hydraulic braking systems. 2 Reference standards
GB2423.17 Basic environmental testing procedures for electrical and electronic products Test Ka: Salt spray test method 3 Metal pipes
3.1 Metal pipes without flaring
Double-layer rolled pipes. The basic dimensions, bursting pressure and mass per meter shall comply with the provisions of Table 1. Metal pipes may also be coated with plastic on their outer surfaces, but they shall meet the requirements for the use of internal and external threaded pipe joints and hose end joints specified in this standard. Table 1
Diameter D,
(without surface treatment))
Basic size
Limit deviation
Basic size
Limit deviation
Outer diameter D of pipe
(with surface treatment)
Burst pressure
Note: 1) Metal pipes without surface treatment refer to metal pipes rolled with surface treated materials. When used, no surface treatment is required. The roundness value of the metal pipe should be limited to the outer diameter tolerance. 3.2 Metal pipes with flared
The flared pipes are made of the pipes in Table 1. The appearance of the flared pipes and the pipe joints used are shown in Figure 1. The types and sizes of the flared pipes shall be in accordance with the provisions of Figure 2 and Table 2.
Approved by the State Administration of Technical Supervision on August 28, 1989 and implemented on March 1, 1890
G B. 11611-89
R0.45±0.15bzxZ.net
Note: [D is the theoretical correct size, which is used as the measurement basis for E, size. 3.3 Material properties of metal pipes
shall comply with the provisions of Table 3.
Within the range of Ei
Within the range of E
Material 1)
Steel 10, 20
Tensile strength 2)
Note: 1) For metal pipes that have not been straightened. 2) Open-hearth steel or top-blown oxygen converter steel.
3.4 ​​Technical requirements
GB 11.61 1—89
Yield point
Elongation at failure
Rockwell hardness
HR30T≤55
The inner and outer surfaces of the metal pipe should be free of oxide scale, and the outer surface should be corrosion-resistant and able to withstand a salt spray test lasting not less than 96 hours. The test method should comply with the provisions of GB2423.17. Pipe threaded holes with cone seal
The type and size of the pipe threaded holes with cone seal should comply with the provisions of Figure 3 and Table 4. 10.14
120°±5°
120°±2
M10× 1
M12× 1
M16 ×1.5
5 Externally threaded pipe fittings
5.1 Type and dimensions
GB 11611—89
The type and dimensions of externally threaded pipe fittings shall conform to the requirements of Figure 4 and Table 5. The depth of the cutter is D11
Outer diameter of metal pipe
M10×1
M12×1
Circular channel or dimensional surface is allowed
5.2 Technical requirements
GB11611-89
The inner and outer surfaces of the external threaded pipe joint shall be free of oxide scale, and the outer surface shall be corrosion-resistant and able to withstand the salt spray test for a duration of not less than 48 hours. The test method shall comply with the provisions of GB2423.17. 5.3 Physical properties
The breaking torque shall comply with the provisions of Table 6.
M10x 1
M12×1
Dimension Dio
Hose end joint
Breaking torque
Torque, N·m
The type and size of the external threaded joint for the hose end for cone seal shall comply with the provisions of Figure 5 and Table 7. Li
M10×1
M12×1
Breaking torque
The size of the internal thread hole of the pipe joint shall comply with the specifications in Table 4. The size of the internal thread joint type of the hose end shall comply with the provisions of Figure 6 and Table 8. 6.2
M10x i
M12×1
0.5×45°
GB 11611—89
Additional instructions:
This standard is proposed by the China Automobile Industry Federation. This standard is under the jurisdiction of Chongqing Automobile Research Institute. This standard was drafted by Nanjing Automobile Manufacturing Plant. 276
Breaking torque
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