BS 919-1:1960

Cooperating organizations
Foreword
Specification
1. Scope
2. Nomenclature
Section one: Notes on the inspection of product threads
3. Methods of inspection
4. Method of specifying the product thread
5. Conventional thread gauging practice and its
     limitations
6. Gauge tolerances and gauge tolerance zones
Section two: Notes on the use of various types of gauges
7. GO and NOT GO screw gauges
8. Setting plugs
9. Check gauges
10. Relative advantages and disadvantages of solid
     screw ring gauges, adjustable screw ring gauges
     and calliper gauges
Section three: Inspection of product threads by direct
measurement
11. Methods of measurement
Section four: Gauge tolerance tables
12. Types of gauges
Section five: General requirements
13. Design
14. Hardness
15. Gauge wear
16. Disputes
17. Marking
Tables
Tolerances
1. GO screw plug gauges
2. NOT GO screw plug gauges
3. GO and NOT GO plain plug gauges for minor diameters
4. GO screw ring gauges, solid type
5. NOT GO effective diameter ring gauges, solid type
6. GO screw check plugs for GO screw ring gauges,
     solid type
7. NOT GO effective diameter check plugs for new GO
     screw ring gauges, solid type
8. NOT GO effective diameter check plugs for worn
     GO screw ring gauges, solid type
9. GO screw check plugs for NOT GO effective diameter
     ring gauges, solid type
10. NOT GO screw check plugs for NOT GO effective
     diameter ring gauges, solid type
11. GO and NOT GO plain check plugs for the minor
     diameters of GO and NOT GO screw ring gauges -
     solid type
12. Adjustable GO screw ring and calliper gauges
13. Adjustable NOT GO screw ring and calliper gauges
14. Double length setting plugs for adjustable GO screw
     ring gauges
15. Double length setting plugs for adjustable NOT GO
     screw ring gauges
16. Single length setting plugs for adjustable GO
     screw calliper gauges
17. Single length setting plugs for adjustable NOT GO
     screw calliper gauges
18. GO and NOT GO plain calliper (gap) gauges for
     major diameters
General
19. Constants for use in computing gauge dimensions
20. Effective diameter equivalents of errors in pitch
21. Effective diameter equivalents of errors in flank
     angles
22. Summary of GO and NOT GO screw gauges and plain
     gauges for checking unified threads
Appendices
A. Conventional illustration of tolerance zones
B. Effective diameter equivalent of pitch and angle
     errors
C. A recommended system of gauges for coated screw
     threads
D. Notes on the setting to size of adjustable screw
     ring gauges
E. Examples illustrating the method of determining the
     diametral limits of size of gauges and setting
     plugs
F. Comparison between the designations of British and
     American gauges

Go and not go screw plugs, rings, and calipers; adjustable type setting plugs for screw rings and calipers; check plugs for solid screw rings; go and not go plain plugs and calipers. Inspection of product threads, use of various gauges, inspection of product threads by direct measurement, gauge tolerance tables. Appendices: illustration of tolerance zones, effective diameter equivalent of pitch and angle error, gauges for plated screw threads, setting to the size adjustable screw ring gauges, determining limiting sizes of gauges and setting plugs, comparison between British and American gauges.