-JIS B 0209-2001 通用公制螺纹公差.pdf

JIS B 0209
Limits of Sizes and Tolerances
for Metric Coarse Screw Threads
This Japanese Industrlal Standard specifies the 1imits of sizes ane
tolerances far metric coarse screw threads specifled in JIS B 0205 to
a⊥ nly for fasten⊥ng
The 1imits of sizes and tolerances for Quallty 1, Quality 2 and Qualit
1 For M I TOM
68 1n designation of screw threads shall be in accordance with
Appendix 1, and those fot M 1.7, M 2.3 and M 2.6
th Append⊥
Remark: The limtt of sizes and tolerances specified in the body of
liis standard are In accordance with JIS B 0215 and the 11m1ts
af sizes Eor medium quality of metric coarse screw threads
specifled in ISO 965/2 are contained in Attached Table 3 and
Attached Table 4
2. Relations of Basic Profles Basie Dimensions, Limits of Sizes
olerances and Fundamental Deviations
The relations of basic profiles, basic dimensions, limits of sizes
tolerances and fundamental deviations are show in Fig. 1
F1g?1? Figure of
Relations of Basic Profiles, Basic Dimensions
Limits of Sizes, Tolerances and Fund amental Dev1atlons
for Metric Coarse Screw Threads
() In the Case of 4 H, 5 H, 6 H and 7 H(ER-0
In tarnal
thread
2) In the Ca
Ise of 4 h and 6 h(e80)(3)In the Case of 6 g and
8 g(e8<0)
?
? external
External
thread
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B0209
he meaning of the symbols in Fig. 1 i8 as fpllows
D,D。 and D.
basic dimension, maximum and minimum
permiss ble dimensions of major diameter
of internal thread
D: D: m, Dme, 7b and E/
basic dimension, maxiumm and minimum
permissible dimensions, tolerance and
fund ament al deviation of pitch diameter
of internal thread
on and Er
asic dimens
permissible dimensions, tolerance an
fund amenta] deviation of minor diameter
f internal thread
T and G
basic dimensi on, maximum and minimum
permissible dimensions, tolerance and
fund amental deviation of mafor di am.
of external thread
dr, drmaa, daun, T4g and e
basic dimension, maximum and minimum
permissible dimensions, tolerance and
fundamental deviation of pdtch diameter
of external thread
』an
ea8lc dimension, maximum and minmum
permissible dimensions of minor diameter
of external thread
The bold continuous lineg show the basic profile, and the ob 11que-1ined
portion shows permissible range of internal or external thread
The numerical values of. D. DA, Dm d, d, and d, are specifled in Table of
JIS80205.
3. Fteidgqualltles Tolerance Classes, Limits of Sizes and Toler ances
of Screw Threads
The fitting qual:ties Shall be divided into fine, medium and coarse
and the corresponding tolerance clasees shall be as shown in the following
Table. The limits of sizes and tolerances shall be in accordance with
Attached Tables 1 to 6, according to the division in the following Table
The limits of Sizes and tolerances in Attached Tableb 1 to 6 are sho
with referring to thread engagement group N specified in JIS B 0215,
however, in the cabe of 5 whose length of thread engagement 18 Shorter
and in the case of L whose length of thread eng agement 18 longer, thobe
11 be in accordance with JIS B 0215
Further, independent of fitting quality, the combination of