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JBF National B Series sprue bushings come hardened and ground, and feature a 43/45 RC through hardness.
Unit of Measure

Dimensions

Dimension T

N/A 5-9/32 in

Dimension B

N/A 4-13/32 in

Dimension E

N/A 5/32 in

Dimension R

N/A 3/4 in

Technical Specs

Brands

N/A JBF National

Hardness

N/A 43/45 Rockwell C

Drawings

N/A