GB/T 5796.3-1986 Basic dimensions of trapezoidal threads

GB/T 5796.3-1986 Basic dimensions of trapezoidal threads GB/T5796.3-1986 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Metric trapezoidal screw threads-Basic dimensions
UDC 621.882.082.4
GB 5796.3--86
Replaces GB 781-65
This standard specifies the basic dimensions of trapezoidal threads according to GB5796.1--86 "Trapezoidal thread profile" and GB5796.2-86 "Trapezoidal thread, diameter and pitch series". This standard is equivalent to the international standard ISO2904-1977 "ISO metric trapezoidal thread-basic dimensions". The names, codes and relationship of the basic dimensions of the thread are listed in Table 1. Table 1
External thread major diameter
Tooth top clearance
Basic tooth profile height
External thread tooth height
Internal thread tooth height
Tooth top height
External thread pitch diameter
Internal thread pitch diameter
External thread minor diameter
Internal thread minor diameter
Internal thread major diameter
External thread tooth top filletWww.bzxZ.net
Tooth bottom fillet
Published by the National Bureau of Standards on January 21, 1986
h3 =H, + ae =0.5P+ a
H =H, + ac =0.5p +a.
Z = 0.25 P=H1/2
d2 =d-2Z=d-0.5P
D, -d-
-22 -d-0.5P
d=d-2h3
D,=d-2H,
D, -d+2ad
Rimax -0.5ac
R2max = ac
1987-01-01Implementation
2The basic dimensions of each diameter are listed in Table 2.
Nominal diameter d
First series
Second series
GB5796.3-86
d2 = D,
Nominal diameter d
First series
Second series
GB 5796.3-86
Continued Table 2
d2 = D2
Nominal diameter d
First series
Second series
GB 5796.3-86
Continued Table 2
dz = D,
Nominal diameter d
First series
Second series
GB 5796.3---86
Continued Table 2
dz = D2
124,000
Nominal diameter d
First series
Second series
GB 5796.3--86
Continued table 2
Medium diameter national
d2 = D2
Nominal diameter d
First series
Additional notes:
Second series
GB5796.3—86
Continued table 2
d = D2
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 Tu Wenyi. 274
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