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 sujetadores estándar and confirm whether the product follows DIN, ISO, ASTM, or a project drawing.

What Procurement Teams Should Confirm

Size Alone Is Not Enough

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

Confirmar:

• Product type: bolt, screw, nut, washer, stud, or anchor
• Diámetro y longitud
• 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
• Tuercas y arandelas a juego

For bolt sourcing, review productos de pernos. Para hacer coincidir la lavadora, verifique productos de lavado.

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, sujetadores de alta resistencia may be required. For outdoor, marine, or humid environments, compare varios sujetadores recubiertos or stainless options.

If the part has special head shape, long thread, shoulder diameter, or non-standard length, use sujetadores personalizados no estándar and provide a drawing.

Consejo final

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.

Para un abastecimiento más amplio, revise el completo productos de fijación range before finalizing the RFQ.