A metric fastener size chart helps procurement and engineering teams speak the same language. It reduces wrong RFQs, wrong thread matching, and last-minute assembly problems.

In metric fasteners, size is usually written as M + nominal diameter × pitch × length. For example, M12 × 1.75 × 80 means a 12 mm nominal diameter, 1.75 mm thread pitch, and 80 mm length.

For buyers, the key is not only the “M size.” Pitch, length, grade, coating, and matching nuts or washers must also be confirmed.

Basic Metric Fastener Size Chart

Common Metric Sizes and Coarse Pitches

This chart is a starting point. Final selection should follow the drawing, project standard, or equipment manual.

For common catalog items, review Standardbefestigungen and confirm whether the product follows DIN, ISO, ASTM, or a project drawing.

What Procurement Teams Should Confirm

Größe allein reicht nicht aus

A purchase request that says “M12 bolt” is incomplete. It can still lead to the wrong product.

Bestätigen:

• Product type: bolt, screw, nut, washer, stud, or anchor
• Durchmesser und Länge
• Thread pitch: coarse or fine
• Thread length: full thread or partial thread
• Grade: 4.8, 8.8, 10.9, 12.9, A2-70, etc.
• Surface finish: plain, zinc, HDG, zinc flake, black, stainless
• Passende Muttern und Unterlegscheiben

For bolt sourcing, review Bolzenprodukte. Überprüfen Sie die Übereinstimmung der Unterlegscheiben Waschmaschinenprodukte.

Engineering Checks Before Approval

Match the Size to the Application

Engineering teams should consider load, vibration, corrosion, installation space, and maintenance frequency.

For load-bearing assemblies, hochfeste Verbindungselemente may be required. For outdoor, marine, or humid environments, compare verschiedene beschichtete Verbindungselemente or stainless options.

If the part has special head shape, long thread, shoulder diameter, or non-standard length, use kundenspezifische, nicht standardmäßige Verbindungselemente and provide a drawing.

Abschließender Rat

A metric fastener size chart is useful, but it should not replace a complete specification. Good purchasing data includes size, pitch, length, standard, grade, coating, matching parts, and application condition.

Für eine umfassendere Beschaffung sehen Sie sich die vollständige Liste an Verbindungselemente range before finalizing the RFQ.