This Part specifies the dimensional specifications and tolerances for sprue bushings for plastic injection moulds. This section applies to sprue sleeves used in plastic injection molds. This part also gives material guidelines and hardness requirements, and specifies the marking of sprue bushings.
GB/T 4169.19-2006 Referenced Document
GB/T 4170-2006 Specification of components of injection moulds for plastics*, 2006-12-08 Update
GB/T 4169.19-2006 history
2006GB/T 4169.19-2006 Components of injection moulds for plastics.Part 19:Sprue bush