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BUTRESS
/SAW TOOTH THREAD SERIES
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| APPLICATION |
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This
type of threading basically used for gun barrels so that it
can withstand recoiled impact. They are also used for screw
jack, where positive locking is required.
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| GENERAL |
| In
British standard imperial system is used i.e. diameter is in
inches and pitch is expressed in TPI. In IS standard diameter
and pitch is given in mm. |
| SPECIFICATION |
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Basic
dimensions : B.S. 1657 – 1950 used for 45/7º and 0/52º thread
profiles.
I.S. 4696 Part I,II,III – 1976 & IS 4696 Part IV–1980,
for 3/30º thread profile.
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| CLASS
OF FIT |
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As
per British Standard Medium, Close and Free
classes.
As per IS Standard For screw ring gauges. i.e.
external threads- class 'c' and 'e'.For screw plug gauges,
i.e. internal threads class 'H'.Tolerance grade above
7 are progressively coarser.
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| DESIGNATION
/ MARKING SYSTEM |
1.1/2"
-- 10 Butress (M) 45/7º
7/8" --
12 Buttress (C) 0/52º.
ST40x7 -- 7H (3/30º)
ST24x5 -- 8c (3/30º)
STx10 -- 9e.(3/30º) |
KINDLY CONFIRM SPECIFICATION TO BE FOLLOWED THREAD PROFILE,
CLASS OF FIT WITH ENQUIRY. |
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