The requirements of the above standards are essentially the same. In the following any significant difference in the contents of these standards will be stated; minor differences will be ignored.
The standards detail the minimum requirements for compliance, eg details of such as: manufacture dimensions marking material composition testing procedure mechanical properties certification.
The features by which a chain may be identified are:
The size of the chain refers to the nominal diameter of the material from which the link is made. The standards specify the maximum and minimum limits of the diameter of the material for every nominal chain size. These limits on material size are roughly ±5 percent of the normal diameter.
To obtain the chain size, the material from which the link is made should be measured:
The letters L, M, P, S and T are used to designate the strength grade of the chain. The letter designating the particular strength grade must be stamped or embossed on either every twentieth link or every 1 metre of chain, whichever is the lesser.
The marking must not:
The following marks must be legibly and permanently displayed either on the links of each manufactured chain length or on metal tabs which are permanently attached to each end of each manufactured chain length:
PWB Chain markings & specifications - pre 1997
PWB AS/NZS4344:1995 Chain markings & specifications - 97/98 onwards
The chain tables on this page are reprinted by permission from the Lifting Equipment Engineers New Zealand Inc.
Note: With respect to the Minimum breaking strength and elongation of chain table:
Bradlink chain markings & specifications
Serafini chain markings & specifications
Wiessenfel chain markings & specifications
Yoke grade 70 transport chain markings & specifications
Grade 80 & 100 chain (designed for lifting).
Used for specialist heavy transport applications
Grade 80 &100 chain markings
Minimum breaking strength and elongation of chain to BS 4942
Last updated: 26 January 2016