BS 1657:1950
Current
The latest, up-to-date edition.
Specification for buttress threads
Hardcopy , PDF
English
17-08-1950
Co-operating organizations
Foreword
Specification
1 Scope
2 Definitions
3 Basic form of British Standard buttress thread
4 Preferred diameters
5 Preferred pitches
6 Tolerances
7 Allowances
8 Designation of British Standard buttress threads
9 Gauges
Tables
1 Numerical data for standard form buttress screw
threads
2 Tolerances. Close class
3 Tolerances. Medium class
4 Tolerances. Free class
5 Allowances. All classes
Fig. 2: Relative tolerances and allowances for the
three classes of buttress threads
Fig. 3: Disposition of allowances and tolerances for
standard form buttress screw threads
6 Design sizes for gauges
Fig. 4: Thread forms of buttress thread gauges
7 Numerical data for special 0 deg/52 deg buttress
screw threads
8 Thread measuring cylinders for standard form
buttress threads
9 Thread measuring cylinders for special 0 deg/52 deg
form buttress threads
Appendices
A Special 0 deg/52 deg form of buttress thread
B Effective diameter equivalents for pitch and angle
errors
C Measurement of effective diameters of buttress screws
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