BS 2969:1980

National foreword
Cooperating organizations
Specification
1. Scope and field of application
2. References
3. Definitions
4. Dimensions of chains
5. Material and manufacture
6. Test requirements
7. Inspection procedure
Annexes
A. Force-extension diagram
B. Multiple pitch lengths with tolerances
C. Typical examples of matching tolerances for
     matched lengths of long chain
D. Information required with enquiry or order
E. Fatique test - statistical analysis
F. Notch impact test
Tables
1. Chain link dimensions and mass
2. Content of sulphur and phosphorus
3. Mechanical properties - Basic table
4. Mechanical properties - Specified test forces
5. Gauge length and setting force
6. Fatigue test - Anchorage pin dimensions
7. Fatigue test - Lower and upper stress levels
     (approximate)
8. Fatigue test - lower and upper force levels
9. Bend test - Deflection
10. Multiple pitch lengths
11. Matched lengths
Figures
1. Dimensions of chains
2. Chain link dimensions
3. Chain anchorage for static tensile test
4. Anchorage pin
5. Anchorage fork
6. Bend test
7. Force-extension diagram (illustration of terms)
8. Matched lengths
9. Fatique life/probability diagram - Reference
     standard chain
10. Source of test pieces

Calibrated chains having links 14 mm to 30 mm diameter, three grades (B, C and D). Dimensions, material, test requirements, marking, inspection, test certificate (not for lifting purposes).

This International Standard specifies the requirements for a range of high grade special purpose calibrated, high-tensile, electrically welded, steel chains (round link) for use with machines and equipment in mining, such as the following:

1. conveyors, flexible and rigid, of the chain type, chain belt conveyors, gate end and stage loaders;
2. coal ploughs, coal cutters and power loaders;
3. bucket elevators;
4. other similar machines used in mines.

This International Standard covers a size range from 14 to 30 mm. Three grades of quality (B, C and D) are specified with regard to the mechanical properties of chain. The values given for grade D in Table 3, Table 4, Table 7 and Table 8 are, however, provisional.

Chains covered by this International Standard are not designed for lifting appliances, such as cranes and slings.