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JBF National B Series sprue bushings come hardened and ground, and feature a 43/45 RC through hardness.
B Series Sprue Bushings
<!-B Series Sprue Bushings - 2->
Unit of Measure
1 

Item #

Dimension T

Dimension B

Dimension E

Dimension R

Drawings

BW8605 N/A 1-25/32 in N/A 29/32 in N/A 5/32 in N/A 1/2 in

BW8609 N/A 2-9/32 in N/A 1-13/32 in N/A 5/32 in N/A 1/2 in

BW8613 N/A 2-25/32 in N/A 1-29/32 in N/A 5/32 in N/A 1/2 in

BW8617 N/A 3-9/32 in N/A 2-13/32 in N/A 5/32 in N/A 1/2 in

BW8621 N/A 3-25/32 in N/A 2-29/32 in N/A 5/32 in N/A 1/2 in

BW8625 N/A 4-9/32 in N/A 3-13/32 in N/A 5/32 in N/A 1/2 in

BW8629 N/A 4-25/32 in N/A 3-29/32 in N/A 5/32 in N/A 1/2 in

BW8633 N/A 5-9/32 in N/A 4-13/32 in N/A 5/32 in N/A 1/2 in

BW8637 N/A 5-25/32 in N/A 4-29/32 in N/A 5/32 in N/A 1/2 in

BW8641 N/A 6-25/32 in N/A 5-29/32 in N/A 5/32 in N/A 1/2 in

BW8606 N/A 1-25/32 in N/A 29/32 in N/A 7/32 in N/A 1/2 in

BW8610 N/A 2-9/32 in N/A 1-13/32 in N/A 7/32 in N/A 1/2 in

BW8614 N/A 2-25/32 in N/A 1-29/32 in N/A 7/32 in N/A 1/2 in

BW8618 N/A 3-9/32 in N/A 2-13/32 in N/A 7/32 in N/A 1/2 in

BW8622 N/A 3-25/32 in N/A 2-29/32 in N/A 7/32 in N/A 1/2 in

BW8626 N/A 4-9/32 in N/A 3-13/32 in N/A 7/32 in N/A 1/2 in

BW8630 N/A 4-25/32 in N/A 3-29/32 in N/A 7/32 in N/A 1/2 in

BW8634 N/A 5-9/32 in N/A 4-13/32 in N/A 7/32 in N/A 1/2 in

BW8638 N/A 5-25/32 in N/A 4-29/32 in N/A 7/32 in N/A 1/2 in

BW8642 N/A 6-25/32 in N/A 5-29/32 in N/A 7/32 in N/A 1/2 in

BW8607 N/A 1-25/32 in N/A 29/32 in N/A 5/32 in N/A 3/4 in

BW8611 N/A 2-9/32 in N/A 1-13/32 in N/A 5/32 in N/A 3/4 in

BW8615 N/A 2-25/32 in N/A 1-29/32 in N/A 5/32 in N/A 3/4 in

BW8619 N/A 3-9/32 in N/A 2-13/32 in N/A 5/32 in N/A 3/4 in

BW8623 N/A 3-25/32 in N/A 2-29/32 in N/A 5/32 in N/A 3/4 in

BW8627 N/A 4-9/32 in N/A 3-13/32 in N/A 5/32 in N/A 3/4 in

BW8631 N/A 4-25/32 in N/A 3-29/32 in N/A 5/32 in N/A 3/4 in

BW8635 N/A 5-9/32 in N/A 4-13/32 in N/A 5/32 in N/A 3/4 in

BW8639 N/A 5-25/32 in N/A 4-29/32 in N/A 5/32 in N/A 3/4 in

BW8643 N/A 7-25/32 in N/A 6-29/32 in N/A 5/32 in N/A 3/4 in

BW8608 N/A 1-25/32 in N/A 29/32 in N/A 7/32 in N/A 3/4 in

BW8612 N/A 2-9/32 in N/A 1-13/32 in N/A 7/32 in N/A 3/4 in

BW8616 N/A 2-25/32 in N/A 1-29/32 in N/A 7/32 in N/A 3/4 in

BW8620 N/A 3-9/32 in N/A 2-13/32 in N/A 7/32 in N/A 3/4 in

BW8624 N/A 3-25/32 in N/A 2-29/32 in N/A 7/32 in N/A 3/4 in

BW8628 N/A 4-9/32 in N/A 3-13/32 in N/A 7/32 in N/A 3/4 in

BW8632 N/A 4-25/32 in N/A 3-29/32 in N/A 7/32 in N/A 3/4 in

BW8636 N/A 5-9/32 in N/A 4-13/32 in N/A 7/32 in N/A 3/4 in

BW8640 N/A 5-25/32 in N/A 4-29/32 in N/A 7/32 in N/A 3/4 in

BW8644 N/A 7-25/32 in N/A 6-29/32 in N/A 7/32 in N/A 3/4 in

Unit of Measure
1