GB/T 5782 Hex Head Bolt

Compare nominal values

Use this table to understand markings, not to calculate a safe working load or an installation torque. MPa is equivalent to N/mm².

Sources: Bossard

Choose for the complete joint

A higher class is not automatically a better replacement. Check the specified preload, mating nut, washer, thread engagement, coating and service environment together. Changing the lubricant or finish can change the torque needed to achieve the intended clamp force.

Low and countersunk heads may have reduced loadability. For a countersunk socket screw, check its product standard as well as its property class before applying data from a conventional hex bolt.

Sources: ISO 898-1:2013

What to include in your RFQ

State the product standard, thread diameter and pitch, length, property class, finish and quantity. Include the drawing revision and required inspection documents. If replacing an existing fastener, provide its markings and assembly requirements rather than relying on a photograph alone.