Machinery's Handbook, 31st Edition
2080
BUTTRESS THREADS Form of American National Standard 7 °/ 45 ° Buttress Thread with 0.6 p Basic Height of Thread Engagement
Internal Thread
p
r
s
f
90 °
.5 G
.5 h
7 °
.5 h
h e
45 °
F
H h n h
F
h s
.5 h
0.020 p radius approx. (Optional)
f
s
r
(Basic) Pitch Dia. ( E ) Min Pitch Dia. of Internal Thread Max Pitch Dia. of External Thread Major Dia. of External Thread
Nominal (Basic) Major Dia. ( D ) Minor Dia. of External Thread Minor Dia. of Internal Thread (Basic) Minor Dia. ( K )
Fig. 2a. Round Root External Thread
Note: Heavy Line Indicates Basic Form
Internal Thread
p
Max Corner Rounding = r
S
s
s
.5 G
f
.5 G
.5 h
7 °
.5 h
45 °
F
H h n
h
h e
F
h s
.5 h
0.020 p Radius Approx. (Optional)
f
s
s
Max Corner Rounding = r
(Basic) Minor Dia. (K)
S
(Basic) Pitch Dia. ( E ) Min Pitch Dia. of Internal Thread Max Pitch Dia. of External Thread Major Dia. of External Thread
Nominal (Basic) Major Dia. ( D ) Minor Dia. of External Thread Minor Dia. of Internal Thread
Fig. 2b. Flat Root External Thread
Note: Heavy Line Indicates Basic Form
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