How do I check chain length and weight tolerances?

Measure length on a flat surface or measuring board with the chain straight but not stretched, include the clasp as specified, and weigh each sample. Compare with the agreed tolerances and record the results.

Length

Our advice Decide in advance whether length includes the clasp and any extender. Measure the same way for every chain.

1. Lay the chain flat on a ruler or measuring board.
2. Straighten it without stretching.
3. Measure from end to end, including or excluding the clasp as agreed.
4. Repeat with several chains.

Weight

1. Use a calibrated scale.
2. Weigh the whole chain, including the clasp.
3. Weigh several samples and record the range.

Tolerances

• A tolerance is the acceptable difference from the specified value
• Agree separate tolerances for length and for weight
• Chains with many small links will vary more than simple designs

It depends What counts as an acceptable tolerance is a business decision. Tight tolerances cost more, so agree them with the supplier before production.

Out of tolerance

Our advice Photograph and record the measurements, then contact the supplier with the specification and the figures. Ask whether they can re-make, adjust or give a price credit.

Prevent problems

• Specify measurement method as well as value
• Check the first articles before mass production

A simple record

Our advice For each batch, write the style, specified length and weight, the lowest and highest measured values and the average. A short table like this shows at a glance whether a batch is consistent, and whether it is drifting from earlier orders. It is also useful evidence if you need to ask for a credit or a remake.

Our advice Measure length with the chain laid flat and not stretched, and use the same method each time. Weigh a few pieces from the batch, record the figures and compare them with the agreed tolerance.

Our advice Write the tolerance in the order, and say how you measure it, so the inspector and the factory use the same method.

Uncertain We cannot set tolerances for your products. Use your specification and ask the factory what they can achieve.

Related reading: How is silver weight tolerance handled in a quotation? · Diamond Pendant Necklace Length and Chain Pairing

Sources

No external standard governs this question, so this answer is editorial advice from the ZKZ team and is labelled that way.

Fact = stated by the cited source. Our advice = editorial recommendation. Uncertain / it depends = limits of what can be said in general.