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M6
The round head Neck carriage bolts are divided into large semi-circular Cup Head Square Neck carriage bolts (corresponding to standard GB/T14 and DIN603) and small semi-circular Cup Head Square Neck carriage bolts (corresponding to standard GB/T12-85). A Cup Head Square Neck carriage bolt, a type of fastener consisting of a head and a screw (a cylinder with an external thread), is required to be fitted with a nut for fastening two parts with through holes.
The round head Neck carriage bolts are divided into large semi-circular Cup Head Square Neck carriage bolts (corresponding to standard GB/T14 and DIN603) and small semi-circular Cup Head Square Neck carriage bolts (corresponding to standard GB/T12-85). A Cup Head Square Neck carriage bolt, a type of fastener consisting of a head and a screw (a cylinder with an external thread), is required to be fitted with a nut for fastening two parts with through holes.
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