BUTTRESS THREADS are used in the construction of artillery with the screw type breech block / gun barrels OR vices & screw jack. As Buttress Threads can withstand the axial load placed on it OR high force only in one direction, these are suitable for above applications.
American Specifications : ANSI/ ASME B1.9 : 1973 for 7o/45o thread Profile.
B.S Specifications : B.S 1657 : 1950 used for 7o/45o and 0/52o thread profile.
DIN Specifications : Basic Dimensions : DIN 513 : 1985, IS 4696 : 2004
Gauging Practice : DIN 103 - 9 : 1985.
Manufacturing Range :
Thread Plugs , Thread Rings, Check Plugs & Wear Check Plugs of Diameter from 1/2" to 14" and TPI from 20 to 2.
|Gauge Type||Diameter Range (Inch)||TPI (Threads per Inch)||Tolerance
Class as per BS 1657
Class as per ANSI B1.9
Class as per DIN
|Thread Plug Gauges.||0.5 - 12||20, 16, 12, 10, 8, 6, 5, 4, 3
TPI not covered
here can be supplied
if requested by customer
|Class 2 (standard grade)
Class 3 (precision grade)
|Thread Ring Gauges.||0.5 -10.2||7e|
|Check Plug Gauges.||0.5 -12||7e|
|Wear Check Plug Gauges.||0.5 -12||7e|
Buttress with Hydraulic sealing thread form used in Oil fields is not considered here.