Master Lock 643D Combination lock reference

Specifications

Body width

1-9/16 in (40 mm)

Shackle length

7/8 in (22 mm)

Inside shackle width

7/8 in (22 mm)

Shackle diameter

1/4 in (6 mm)

Colour

Silver colour

Code entry

User-set four-digit combination

Model and scope of documentation

This record covers official model 643D; the source is the manufacturer's US product page. Model suffixes form part of the product identity and must be retained when checking procurement or replacement documents.

The original page identifies the brand as Master Lock. This site's Chinese source organised the readable specifications into labelled fields; dimensions retain the manufacturer's original units and conversions without changing the measurement reference.

How to use these dimensions

The official technical fields for this model include: Body width 1-9/16 in (40 mm); Shackle length 7/8 in (22 mm); Inside shackle width 7/8 in (22 mm); Shackle diameter 1/4 in (6 mm). These values identify this model and do not represent other products from the same brand.

Compare each specification with the existing mating components, then consult the illustrations on the original page. Similar dimension names do not necessarily use the same reference points; send annotated photographs to the manufacturer if clarification is needed.

Selection checklist

The following are documentation recommendations, not a manufacturer's compatibility guarantee. Matching specifications do not establish interchangeability in every application.

• Check that the complete model 643D matches the physical product or quotation.
• Confirm installation space, mating holes and the clearance needed for opening and closing.
• Separately confirm the supplied configuration, keying, operating environment and applicable local requirements.
• For performance or certification conclusions, inspect evidence for the specific model rather than inferring from appearance or dimensions.

Differences from similarly sized models

643D has the following explicitly stated in its official documentation: Code entry: User-set four-digit combination. When comparing similarly sized models in this group, check these construction and operating details as well; matching body and shackle dimensions do not replace confirmation of materials and mechanisms.

Limitations

• This is model information from the official US catalogue, not a statement of local availability, stock or pricing in Central Asia.
• Dimensions retain the original units; no physical testing or independent compatibility verification has been obtained.
• Image links come from the official source page; image-use permission has not been verified. Confirm performance, warranty and certification on the original page.

Sources

Manufacturer documents are provided in their original language.

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