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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