Diameter is only part of the description
Metric machine threads are described using pitch in millimetres; US inch threads commonly use threads per inch. Bolt Depot’s measurement guide explains that distinction. For example, a metric pitch of 1.5 describes the distance between adjacent threads, rather than a thread count.
Technical reference: Bolt Depot: thread pitch and thread count.
Do not convert an order into a different product
Three-eighths of an inch equals 9.525 mm. That numerical conversion does not turn a 3/8-inch threaded component into M10. The designation, pitch or thread count, mating hardware and applicable product specification still need to match.
A practical purchasing mistake occurs when a spreadsheet rounds dimensions for readability and the rounded value becomes the production instruction. Keep the original designation in the item description. If you add a converted measurement for reference, clearly label it as a reference rather than the ordered size.
The same discipline applies to length. State the unit and the drawing’s measurement convention so the supplier and inspection team are checking the same dimension.
Create an unambiguous line item
Use one complete specification for each SKU, with separate fields for information that could otherwise be misunderstood. An illustrative enquiry format is: product reference; thread designation; length and unit; material; finish; accessories; quantity. This is a data format, not a recommended anchor size.
- Original metric or imperial designation, without rounded substitution.
- Specified pitch or threads per inch where relevant.
- Overall length and drawing revision.
- Matching nut, washer or mating-thread requirements.
- Product-specific drill and installation information requested separately.
- Pack quantity and a label showing the complete ordered size.
Check the sample and the label together
For a mixed range, review one labelled sample from each item before approving artwork. A correct part inside an incorrectly labelled box can create the same customer problem as an incorrect part. Ask the supplier to use the approved item code on the sample record, packing list and carton label.
Keep metric and imperial products as distinct records in the purchasing system, even when their intended applications overlap. When a customer requests an alternative, make that a deliberate review with a new reference. This prevents a temporary workaround from becoming an undocumented change to future orders.
During receiving inspection, use the agreed dimensional and thread checks rather than a visual comparison alone. Record the results against the item code and batch.
Request a clearly identified range
DURANCHOR lists metric wedge anchors and other anchor bolt products. Send the original size schedule, destination market and packaging requirements when discussing an order. Request confirmation of the exact offered designation rather than accepting a general statement that metric and imperial options are available.
Frequently asked questions
Is M10 the same as 3/8 inch?
No. The diameter conversion is not a thread or product equivalence. Specify and verify the required designation.
Can I put both units on packaging?
Yes, if the ordered designation remains unambiguous and any conversion is clearly marked as reference information.
FROM REQUIREMENT TO QUOTATION
Discuss your fixing requirements
Send your drawing or product reference, quantity by size and destination market. Ask DURANCHOR to confirm the offered specification and available supporting documents.
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