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 Uneven machining depth of six sides

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Overlap in plating

 Surface treatment rust removal is incomplete

Thread bump

 The thread is not chamfered with flat head

Head cracking

The ball plane is not parallel to the thread

The pass and stop rules of hole are not qualified

Plating stain

 Uneven heating before deformation of ball head

The feed is too deep at the joint of ball head and rod diameter

 Insufficient heat treatment holding time leads to low center hardness

The rolling thread is incomplete

Continue to use the mold after the fatigue period

Material cracking causes ball cracking in hot forging

 Bending Angle is deviated

The uneven hot forging temperature of the ring nut causes cracking at the largest deformation

Turning round ball surface feed too fast

The hole eccentricity causes the side wall dimension deviation

The bending curvature is not qualified

The particles of shot blasting are too biger and the time is too short

Thread bump

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