GB/T 5796.2-1986 Trapezoidal thread diameter and pitch series GB/T5796.2-1986 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Metric trapezoidal screw threads.-System of diameter and pitchUDC 621.882.082.4
GB 5796.2-86
Replace*
This standard specifies the diameter and pitch series of trapezoidal screw threads with nominal diameters of 8 to 300 mm and tooth profiles that conform to GB5796.1-86 "Trapezoidal thread tooth profile".
This standard is equivalent to the international standard ISO2902-1977 "ISO metric trapezoidal thread-General scheme". 1 The diameter and pitch series shall be in accordance with the provisions of the table.
2 Selection of diameter and pitch
2.1 The diameter of the first series shall be given priority. 2.2 Among the pitches corresponding to each diameter, the pitch in the thick black frame shall be given priority. 2.3 When there is a special need, the pitch corresponding to the adjacent diameter in the table may be selected. 3 Thread code
3.1 Trapezoidal threads that comply with GB5796.186 are indicated by "Tr". 3.2 The size and specification of single-thread threads are indicated by "nominal diameter × pitch", and that of multi-thread threads are indicated by "nominal diameter × lead (P pitch)", both in mm.
3.3 When the thread is left-handed, "LH" shall be added after the size specification, and right-handed threads shall not be indicated. 3.4 Example:
Single-thread thread:
Nominal diameter
Thread type code
Multi-thread left-handed thread:
Tr 40×14(P7) LH
Left-handed thread
Nominal diameter
Thread type code
*Replaces the diameter and pitch series part of GB784-65. Issued by the National Bureau of Standards on January 21, 1986
Implemented on January 1, 1987
Nominal diameter
GB5796.2-86
First series|First series444036322824|222010
Nominal diameter
First seriesSecond series|44140|36|32「2875
GB5796.2-86
G B5796.2—86Www.bzxZ.net
Appendix A
Diameter and pitch of trapezoidal threads with nominal diameters of 300 to 600 mm (reference)
This appendix lists the combination series of diameters and pitches of trapezoidal threads with nominal diameters greater than 300 to 640 mm. Nominal diameter
Series
Series
Flange series
The first series should be used first, followed by the "series, and the third series should be avoided as much as possible. Additional notes:
This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of the Standardization Research Institute of the Ministry of Machinery Industry. This standard was drafted by the national standard working group for trapezoidal threads, and the main drafters were Yu Yuan and Zheng Wenyi. 16
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