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B-Series Mold Bases


B-Series Mold Stacks

B-Series Mold Stacks

The B-series mold has only one parting line. This mold base is not well suited for automatic operation. The “B” series mold is less expensive than the “A” series mold.

B-Series Mold Description

B-Series Mold Description
B-Series Mold Description

Description: (2-plate) molds
Typically called an “open & shut” tool, there is one parting line where the runner and part(s) are ejected. Cores and cavities are typically cut into the “A” and “B” plates. Frequently used when a single cavity is desired. Generally considered less expensive than “A” series.


A single plate is used to satisfy both clamping and cavity core retention. Heavier “A” and “B” plates allow for easier cooling line and sprue bushing location.

  • (+) Lowest cost tool type
  • (+) Large gate required
  • (+) Simple design and construction
  • (+) Low maintenance (tool durability)
  • (-) Requires sprue/runner/gate (cycle time)
  • (-) Sometimes runner must be separated from parts
  • (-) Not well suited for automation
  • (-) Insert changes difficult

Normalized Cost:



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