Basic Metric Thread Chart (M1 – M100)

Documents

Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.

Quotation

• The fastener family (Basic Metric Thread Chart (M1 – M100)) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
• Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
• Quantity per size and your target delivery date.
• Destination country, and any required documents (for example a mill test certificate) so the quote includes them.

Sample & supply

Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.

Storage & shipping

Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.

What pitch is 'M12' if the drawing says nothing?

Coarse — 1.75 mm on this chart. The convention across the metric system is that a bare designation means the ISO coarse pitch, and any fine pitch must be written explicitly (M12x1.5, M12x1.25, M12x1). That convention is why the chart is worth a check before ordering: fastener markings themselves are inconsistent — a bolt head may read 12.9 (property class, not pitch) or M12x150 (length, not pitch) — so the pitch has to come from the drawing's thread callout or a pitch gauge on the mating part, not from the biggest number on the fastener. If you are repairing to a stripped part with no drawing, gauge the pitch (a comb gauge or the mating nut tells you 1.75 from 1.5 instantly), then name it explicitly on the RFQ. 'M12' on an order line is accepted as coarse — anything else must be spelled out.

Why are sizes like M2.6 and M11 on the chart if they are not standard?

They are in the ISO system's non-preferred tier — defined threads that were widely used historically (M2.2 and M2.6 in old sheet-metal and instrument work, M11 and M26 on legacy machinery) but dropped from the preferred series that modern design draws from. They stay on the chart because fastener work is disproportionately about legacy: the machine in the plant was built when M11 was a normal callout, and the repair order still says M11. The practical discipline: for new design, stay on the preferred ladder (this chart's coarse pitches plus its tabulated fine pitches cover it); for repair, match what is in the hardware — and because non-preferred sizes have thinner supply, flag them on the RFQ early so availability is confirmed before the teardown. What the chart does not carry are true special threads (constant-pitch series like M90x2 outside the tabulated options) — those are quoted per the standard, not from this table.